subtree(users/wpcarro): docking briefcase at '24f5a642' r/3226

git-subtree-dir: users/wpcarro
git-subtree-mainline: 464bbcb15c09813172c79820bcf526bb10cf4208
git-subtree-split: 24f5a642af3aa1627bbff977f0a101907a02c69f
Change-Id: I6105b3762b79126b3488359c95978cadb3efa789

73 files changed, 7353 insertions, 0 deletions

diff --git a/users/wpcarro/emacs/.emacs.d/wpc/>.el b/users/wpcarro/emacs/.emacs.d/wpc/>.el
new file mode 100644
index 000000000000..68d8576b8079
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/>.el
@@ -0,0 +1,29 @@
+;;; >.el --- Small utility functions -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Originally I stored the `>>` macro in macros.el, but after setting up linting
+;; for my Elisp in CI, `>>` failed because it didn't have the `macros-`
+;; namespace.  I created this module to establish a `>-` namespace under which I
+;; can store some utilities that would be best kept without a cumbersome
+;; namespace.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defmacro >-> (&rest forms)
+  "Compose a new, point-free function by composing FORMS together."
+  (let ((sym (gensym)))
+    `(lambda (,sym)
+       (->> ,sym ,@forms))))
+
+
+(provide '>)
+;;; >.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/al.el b/users/wpcarro/emacs/.emacs.d/wpc/al.el
new file mode 100644
index 000000000000..e29f853f8ea5
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/al.el
@@ -0,0 +1,255 @@
+;;; al.el --- Interface for working with associative lists -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Firstly, a rant:
+;; In most cases, I find Elisp's APIs to be confusing.  There's a mixture of
+;; overloaded functions that leak the implementation details (TODO: provide an
+;; example of this.) of the abstract data type, which I find privileges those
+;; "insiders" who spend disproportionately large amounts of time in Elisp land,
+;; and other functions with little-to-no pattern about the order in which
+;; arguments should be applied.  In theory, however, most of these APIs could
+;; and should be much simpler.  This module represents a step in that direction.
+;;
+;; I'm modelling these APIs after Elixir's APIs.
+;;
+;; On my wishlist is to create protocols that will allow generic interfaces like
+;; Enum protocols, etc.  Would be nice to abstract over...
+;; - associative lists (i.e. alists)
+;; - property lists (i.e. plists)
+;; - hash tables
+;; ...with some dictionary or map-like interface.  This will probably end up
+;; being quite similar to the kv.el project but with differences at the API
+;; layer.
+;;
+;; Similar libraries:
+;; - map.el: Comes bundled with recent versions of Emacs.
+;; - asoc.el: Helpers for working with alists.  asoc.el is similar to alist.el
+;;   because it uses the "!" convention for signalling that a function mutates
+;;   the underlying data structure.
+;; - ht.el: Hash table library.
+;; - kv.el: Library for dealing with key-value collections.  Note that map.el
+;;   has a similar typeclass because it works with lists, hash-tables, or
+;;   arrays.
+;; - a.el: Clojure-inspired way of working with key-value data structures in
+;; Elisp.  Works with alists, hash-tables, and sometimes vectors.
+;;
+;; Some API design principles:
+;; - The "noun" (i.e. alist) of the "verb" (i.e. function) comes last to improve
+;; composability with the threading macro (i.e. `->>') and to improve consumers'
+;; intuition with the APIs.  Learn this once, know it always.
+;;
+;; - Every function avoids mutating the alist unless it ends with !.
+;;
+;; - CRUD operations will be named according to the following table:
+;;   - "create" *and* "set"
+;;   - "read"   *and* "get"
+;;   - "update"
+;;   - "delete" *and* "remove"
+;;
+;; For better or worse, all of this code expects alists in the form of:
+;; ((first-name . "William") (last-name . "Carroll"))
+;;
+;; Special thanks to github.com/alphapapa/emacs-package-dev-handbook for some of
+;; the idiomatic ways to update alists.
+;;
+;; TODO: Include a section that compares alist.el to a.el from
+;; github.com/plexus/a.el.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies:
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'macros)
+(require 'dash)
+(require 'tuple)
+(require 'maybe)
+
+;; TODO: Support function aliases for:
+;; - create/set
+;; - read/get
+;; - update
+;; - delete/remove
+
+;; Support mutative variants of functions with an ! appendage to their name.
+
+;; Ensure that the same message about only updating the first occurrence of a
+;; key is consistent throughout documentation using string interpolation or some
+;; other mechanism.
+
+;; TODO: Consider wrapping all of this with `(cl-defstruct alist xs)'.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst al-enable-tests? t
+  "When t, run the test suite.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support a variadic version of this to easily construct alists.
+(defun al-new ()
+  "Return a new, empty alist."
+  '())
+
+;; Create
+;; TODO: See if this mutates.
+(defun al-set (k v xs)
+  "Set K to V in XS."
+  (if (al-has-key? k xs)
+      (progn
+        ;; Note: this is intentional `alist-get' and not `al-get'.
+        (setf (alist-get k xs) v)
+        xs)
+    (list-cons `(,k . ,v) xs)))
+
+(defun al-set! (k v xs)
+  "Set K to V in XS mutatively.
+Note that this doesn't append to the alist in the way that most alists handle
+  writing.  If the k already exists in XS, it is overwritten."
+  (map-delete xs k)
+  (map-put! xs k v))
+
+;; Read
+(defun al-get (k xs)
+  "Return the value at K in XS; otherwise, return nil.
+Returns the first occurrence of K in XS since alists support multiple entries."
+  (cdr (assoc k xs)))
+
+(defun al-get-entry (k xs)
+  "Return the first key-value pair at K in XS."
+  (assoc k xs))
+
+;; Update
+;; TODO: Add warning about only the first occurrence being updated in the
+;; documentation.
+(defun al-update (k f xs)
+  "Apply F to the value stored at K in XS.
+If `K' is not in `XS', this function errors.  Use `al-upsert' if you're
+interested in inserting a value when a key doesn't already exist."
+  (if (not (al-has-key? k xs))
+      (error "Refusing to update: key does not exist in alist")
+    (al-set k (funcall f (al-get k xs)) xs)))
+
+(defun al-update! (k f xs)
+  "Call F on the entry at K in XS.
+Mutative variant of `al-update'."
+  (al-set! k (funcall f (al-get k xs))xs))
+
+;; TODO: Support this.
+(defun al-upsert (k v f xs)
+  "If K exists in `XS' call `F' on the value otherwise insert `V'."
+  (if (al-has-key? k xs)
+      (al-update k f xs)
+    (al-set k v xs)))
+
+;; Delete
+;; TODO: Make sure `delete' and `remove' behave as advertised in the Elisp docs.
+(defun al-delete (k xs)
+  "Deletes the entry of K from XS.
+This only removes the first occurrence of K, since alists support multiple
+  key-value entries.  See `al-delete-all' and `al-dedupe'."
+  (remove (assoc k xs) xs))
+
+(defun al-delete! (k xs)
+  "Delete the entry of K from XS.
+Mutative variant of `al-delete'."
+  (delete (assoc k xs) xs))
+
+;; Additions to the CRUD API
+;; TODO: Implement this function.
+(defun al-dedupe-keys (xs)
+  "Remove the entries in XS where the keys are `equal'.")
+
+(defun al-dedupe-entries (xs)
+  "Remove the entries in XS where the key-value pair are `equal'."
+  (delete-dups xs))
+
+(defun al-keys (xs)
+  "Return a list of the keys in XS."
+  (mapcar 'car xs))
+
+(defun al-values (xs)
+  "Return a list of the values in XS."
+  (mapcar 'cdr xs))
+
+(defun al-has-key? (k xs)
+  "Return t if XS has a key `equal' to K."
+  (maybe-some? (assoc k xs)))
+
+(defun al-has-value? (v xs)
+  "Return t if XS has a value of V."
+  (maybe-some? (rassoc v xs)))
+
+(defun al-count (xs)
+  "Return the number of entries in XS."
+  (length xs))
+
+;; TODO: Should I support `al-find-key' and `al-find-value' variants?
+(defun al-find (p xs)
+  "Find an element in XS.
+
+Apply a predicate fn, P, to each key and value in XS and return the key of the
+first element that returns t."
+  (let ((result (list-find (lambda (x) (funcall p (car x) (cdr x))) xs)))
+    (if result
+        (car result)
+      nil)))
+
+(defun al-map-keys (f xs)
+  "Call F on the values in XS, returning a new alist."
+  (list-map (lambda (x)
+              `(,(funcall f (car x)) . ,(cdr x)))
+            xs))
+
+(defun al-map-values (f xs)
+  "Call F on the values in XS, returning a new alist."
+  (list-map (lambda (x)
+              `(,(car x) . ,(funcall f (cdr x))))
+            xs))
+
+(defun al-reduce (acc f xs)
+  "Return a new alist by calling F on k v and ACC from XS.
+F should return a tuple.  See tuple.el for more information."
+  (->> (al-keys xs)
+       (list-reduce acc
+                    (lambda (k acc)
+                      (funcall f k (al-get k xs) acc)))))
+
+(defun al-merge (a b)
+  "Return a new alist with a merge of alists, A and B.
+In this case, the last writer wins, which is B."
+  (al-reduce a #'al-set b))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when al-enable-tests?
+  (prelude-assert
+   (equal '((2 . one)
+            (3 . two))
+          (al-map-keys #'1+
+                          '((1 . one)
+                            (2 . two)))))
+  (prelude-assert
+   (equal '((one . 2)
+            (two . 3))
+          (al-map-values #'1+
+                            '((one . 1)
+                              (two . 2))))))
+
+
+;; TODO: Support test cases for the entire API.
+
+(provide 'al)
+;;; al.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/bag.el b/users/wpcarro/emacs/.emacs.d/wpc/bag.el
new file mode 100644
index 000000000000..38a09d94f900
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/bag.el
@@ -0,0 +1,71 @@
+;;; bag.el --- Working with bags (aka multi-sets) -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; What is a bag?  A bag should be thought of as a frequency table.  It's a way
+;; to convert a list of something into a set that allows duplicates.  Isn't
+;; allowing duplicates the whole thing with Sets?  Kind of.  But the interface
+;; of Sets is something that bags resemble, so multi-set isn't as bag of a name
+;; as it may first seem.
+;;
+;; If you've used Python's collections.Counter, the concept of a bag should be
+;; familiar already.
+;;
+;; Interface:
+;; - add        :: x -> Bag(x) -> Bag(x)
+;; - remove     :: x -> Bag(x) -> Bag(x)
+;; - union      :: Bag(x) -> Bag(x) -> Bag(x)
+;; - difference :: Bag(x) -> Bag(x) -> Bag(x)
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'al)
+(require 'number)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct bag xs)
+
+(defun bag-update (f xs)
+  "Call F on alist in XS."
+  (let ((ys (bag-xs xs)))
+    (setf (bag-xs xs) (funcall f ys))))
+
+(defun bag-new ()
+  "Create an empty bag."
+  (make-bag :xs (al-new)))
+
+(defun bag-contains? (x xs)
+  "Return t if XS has X."
+  (al-has-key? x (bag-xs xs)))
+
+;; TODO: Tabling this for now since working with structs seems to be
+;; disappointingly difficult.  Where is `struct-update'?
+;; (defun bag-add (x xs)
+;;   "Add X to XS.")
+
+;; TODO: What do we name delete vs. remove?
+;; (defun bag-remove (x xs)
+;;   "Remove X from XS.
+;; This is a no-op is X doesn't exist in XS.")
+
+(defun bag-from-list (xs)
+  "Map a list of `XS' into a bag."
+  (->> xs
+       (list-reduce
+        (bag-new)
+        (lambda (x acc)
+          (bag-add x 1 #'number-inc acc)))))
+
+(provide 'bag)
+;;; bag.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/bookmark.el b/users/wpcarro/emacs/.emacs.d/wpc/bookmark.el
new file mode 100644
index 000000000000..76fc6fe4d75b
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/bookmark.el
@@ -0,0 +1,100 @@
+;;; bookmark.el --- Saved files and directories on my filesystem -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; After enjoying and relying on Emacs's builtin `jump-to-register' command, I'd
+;; like to recreate this functionality with a few extensions.
+;;
+;; Everything herein will mimmick my previous KBDs for `jump-to-register', which
+;; were <leader>-j-<register-kbd>.  If the `bookmark-path' is a file, Emacs will
+;; open a buffer with that file.  If the `bookmark-path' is a directory, Emacs
+;; will open an ivy window searching that directory.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 'buffer)
+(require 'list)
+(require 'string)
+(require 'set)
+(require 'constants)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct bookmark label path kbd)
+
+;; TODO: Consider hosting this function somewhere other than here, since it
+;; feels useful above of the context of bookmarks.
+;; TODO: Assess whether it'd be better to use the existing function:
+;; `counsel-projectile-switch-project-action'.  See the noise I made on GH for
+;; more context: https://github.com/ericdanan/counsel-projectile/issues/137
+
+(defun bookmark-handle-directory-dwim (path)
+  "Open PATH as either a project directory or a regular directory.
+If PATH is `projectile-project-p', open with `counsel-projectile-find-file'.
+Otherwise, open with `counsel-find-file'."
+  (if (projectile-project-p path)
+      (with-temp-buffer
+        (cd (projectile-project-p path))
+        (call-interactively #'counsel-projectile-find-file))
+    (let ((ivy-extra-directories nil))
+      (counsel-find-file path))))
+
+(defconst bookmark-handle-directory #'bookmark-handle-directory-dwim
+  "Function to call when a bookmark points to a directory.")
+
+(defconst bookmark-handle-file #'counsel-find-file-action
+  "Function to call when a bookmark points to a file.")
+
+(defconst bookmark-whitelist
+  (list
+   (make-bookmark :label "briefcase"
+                  :path constants-briefcase
+                  :kbd "b")
+   (make-bookmark :label "current project"
+                  :path constants-current-project
+                  :kbd "p"))
+  "List of registered bookmarks.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; API
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun bookmark-open (b)
+  "Open bookmark, B, in a new buffer or an ivy minibuffer."
+  (let ((path (bookmark-path b)))
+    (cond
+     ((f-directory? path)
+      (funcall bookmark-handle-directory path))
+     ((f-file? path)
+      (funcall bookmark-handle-file path)))))
+
+
+(defun bookmark-install-kbds ()
+  "Install the keybindings defined herein."
+  (->> bookmark-whitelist
+       (list-map
+        (lambda (b)
+          (general-define-key
+           :prefix "<SPC>"
+           :states '(normal)
+           (format "J%s" (bookmark-kbd b))
+           (lambda () (interactive) (find-file (bookmark-path b)))
+           (format "j%s" (bookmark-kbd b))
+           ;; TODO: Consider `cl-labels' so `which-key' minibuffer is more
+           ;; helpful.
+           (lambda () (interactive) (bookmark-open b)))))))
+
+(provide 'bookmark)
+;;; bookmark.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/buffer.el b/users/wpcarro/emacs/.emacs.d/wpc/buffer.el
new file mode 100644
index 000000000000..3c78601b79f3
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/buffer.el
@@ -0,0 +1,206 @@
+;;; buffer.el --- Working with buffers -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Utilities for CRUDing buffers in Emacs.
+;;
+;; Many of these functions may seem unnecessary especially when you consider
+;; there implementations.  In general I believe that Elisp suffers from a
+;; library disorganization problem.  Providing simple wrapper functions that
+;; rename functions or reorder parameters is worth the effort in my opinion if
+;; it improves discoverability (via intuition) and improve composability.
+;;
+;; I support three ways for switching between what I'm calling "source code
+;; buffers":
+;; 1. Toggling previous: <SPC><SPC>
+;; 2. Using `ivy-read': <SPC>b
+;; TODO: These obscure evil KBDs.  Maybe a hydra definition would be best?
+;; 3. Cycling (forwards/backwards): C-f, C-b
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'maybe)
+(require 'set)
+(require 'cycle)
+(require 'struct)
+(require 'ts)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst buffer-enable-tests? t
+  "When t, run the test suite.")
+
+(defconst buffer-install-kbds? t
+  "When t, install the keybindings defined herein.")
+
+(defconst buffer-source-code-blacklist
+  (set-new 'dired-mode
+           'erc-mode
+           'vterm-mode
+           'magit-status-mode
+           'magit-process-mode
+           'magit-log-mode
+           'magit-diff-mode
+           'org-mode
+           'fundamental-mode)
+  "A blacklist of major-modes to ignore for listing source code buffers.")
+
+(defconst buffer-source-code-timeout 2
+  "Number of seconds to wait before invalidating the cycle.")
+
+(cl-defstruct source-code-cycle cycle last-called)
+
+(defun buffer-emacs-generated? (name)
+  "Return t if buffer, NAME, is an Emacs-generated buffer.
+Some buffers are Emacs-generated but are surrounded by whitespace."
+  (let ((trimmed (s-trim name)))
+    (and (s-starts-with? "*" trimmed))))
+
+(defun buffer-find (buffer-or-name)
+  "Find a buffer by its BUFFER-OR-NAME."
+  (get-buffer buffer-or-name))
+
+(defun buffer-major-mode (name)
+  "Return the active `major-mode' in buffer, NAME."
+  (with-current-buffer (buffer-find name)
+    major-mode))
+
+(defun buffer-source-code-buffers ()
+  "Return a list of source code buffers.
+This will ignore Emacs-generated buffers, like *Messages*.  It will also ignore
+  any buffer whose major mode is defined in `buffer-source-code-blacklist'."
+  (->> (buffer-list)
+       (list-map #'buffer-name)
+       (list-reject #'buffer-emacs-generated?)
+       (list-reject (lambda (name)
+                      (set-contains? (buffer-major-mode name)
+                                     buffer-source-code-blacklist)))))
+
+(defvar buffer-source-code-cycle-state
+  (make-source-code-cycle
+   :cycle (cycle-from-list (buffer-source-code-buffers))
+   :last-called (ts-now))
+  "State used to manage cycling between source code buffers.")
+
+(defun buffer-exists? (name)
+  "Return t if buffer, NAME, exists."
+  (maybe-some? (buffer-find name)))
+
+(defun buffer-new (name)
+  "Return a newly created buffer NAME."
+  (generate-new-buffer name))
+
+(defun buffer-find-or-create (name)
+  "Find or create buffer, NAME.
+Return a reference to that buffer."
+  (let ((x (buffer-find name)))
+    (if (maybe-some? x)
+        x
+      (buffer-new name))))
+
+;; TODO: Should this consume: `display-buffer' or `switch-to-buffer'?
+(defun buffer-show (buffer-or-name)
+  "Display the BUFFER-OR-NAME, which is either a buffer reference or its name."
+  (display-buffer buffer-or-name))
+
+;; TODO: Move this and `buffer-cycle-prev' into a separate module that
+;; encapsulates all of this behavior.
+
+(defun buffer-cycle (cycle-fn)
+  "Using CYCLE-FN, move through `buffer-source-code-buffers'."
+  (let ((last-called (source-code-cycle-last-called
+                      buffer-source-code-cycle-state))
+        (cycle (source-code-cycle-cycle
+                buffer-source-code-cycle-state)))
+    (if (> (ts-diff (ts-now) last-called)
+           buffer-source-code-timeout)
+        (progn
+          (struct-set! source-code-cycle
+                       cycle
+                       (cycle-from-list (buffer-source-code-buffers))
+                       buffer-source-code-cycle-state)
+          (let ((cycle (source-code-cycle-cycle
+                        buffer-source-code-cycle-state)))
+            (funcall cycle-fn cycle)
+            (switch-to-buffer (cycle-current cycle)))
+          (struct-set! source-code-cycle
+                       last-called
+                       (ts-now)
+                       buffer-source-code-cycle-state))
+      (progn
+        (funcall cycle-fn cycle)
+        (switch-to-buffer (cycle-current cycle))))))
+
+(defun buffer-cycle-next ()
+  "Cycle forward through the `buffer-source-code-buffers'."
+  (interactive)
+  (buffer-cycle #'cycle-next))
+
+(defun buffer-cycle-prev ()
+  "Cycle backward through the `buffer-source-code-buffers'."
+  (interactive)
+  (buffer-cycle #'cycle-prev))
+
+(defun buffer-ivy-source-code ()
+  "Use `ivy-read' to choose among all open source code buffers."
+  (interactive)
+  (ivy-read "Source code buffer: "
+            (-drop 1 (buffer-source-code-buffers))
+            :sort nil
+            :action #'switch-to-buffer))
+
+(defun buffer-show-previous ()
+  "Call `switch-to-buffer' on the previously visited buffer.
+This function ignores Emacs-generated buffers, i.e. the ones that look like
+  this: *Buffer*.  It also ignores buffers that are `dired-mode' or `erc-mode'.
+  This blacklist can easily be changed."
+  (interactive)
+  (let* ((xs (buffer-source-code-buffers))
+         (candidate (list-get 1 xs)))
+    (prelude-assert (maybe-some? candidate))
+    (switch-to-buffer candidate)))
+
+(when buffer-install-kbds?
+  (general-define-key
+   :states '(normal)
+   "C-f" #'buffer-cycle-next
+   "C-b" #'buffer-cycle-prev)
+  (general-define-key
+   :prefix "<SPC>"
+   :states '(normal)
+   "b" #'buffer-ivy-source-code
+   "<SPC>" #'buffer-show-previous
+   "k" #'kill-buffer))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when buffer-enable-tests?
+  (prelude-assert
+   (list-all? #'buffer-emacs-generated?
+              '("*scratch*"
+                "*Messages*"
+                "*shell*"
+                "*Shell Command Output*"
+                "*Occur*"
+                "*Warnings*"
+                "*Help*"
+                "*Completions*"
+                "*Apropos*"
+                "*info*"))))
+
+(provide 'buffer)
+;;; buffer.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/bytes.el b/users/wpcarro/emacs/.emacs.d/wpc/bytes.el
new file mode 100644
index 000000000000..48d3932f1cf8
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/bytes.el
@@ -0,0 +1,113 @@
+;;; bytes.el --- Working with byte values -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Functions to help with human-readable representations of byte values.
+;;
+;; Usage:
+;; See the test cases for example usage.  Or better yet, I should use a type of
+;; structured documentation that would allow me to expose a view into the test
+;; suite here.  Is this currently possible in Elisp?
+;;
+;; API:
+;; - serialize :: Integer -> String
+;;
+;; Wish list:
+;; - Rounding: e.g. (bytes (* 1024 1.7)) => "2KB"
+
+;;; Code:
+
+;; TODO: Support -ibabyte variants like Gibibyte (GiB).
+
+;; Ranges:
+;;  B: [   0,  1e3)
+;; KB: [ 1e3,  1e6)
+;; MB: [ 1e6,  1e6)
+;; GB: [ 1e9, 1e12)
+;; TB: [1e12, 1e15)
+;; PB: [1e15, 1e18)
+;;
+;; Note: I'm currently not support exabytes because that causes the integer to
+;;  overflow.  I imagine a larger integer type may exist, but for now, I'll
+;;  treat this as a YAGNI.
+
+(require 'prelude)
+(require 'tuple)
+(require 'math)
+(require 'number)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst bytes-kb (math-exp 2 10)
+  "Number of bytes in a kilobyte.")
+
+(defconst bytes-mb (math-exp 2 20)
+  "Number of bytes in a megabytes.")
+
+(defconst bytes-gb (math-exp 2 30)
+  "Number of bytes in a gigabyte.")
+
+(defconst bytes-tb (math-exp 2 40)
+  "Number of bytes in a terabyte.")
+
+(defconst bytes-pb (math-exp 2 50)
+  "Number of bytes in a petabyte.")
+
+(defconst bytes-eb (math-exp 2 60)
+  "Number of bytes in an exabyte.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun bytes-classify (x)
+  "Return unit that closest fits byte count, X."
+  (prelude-assert (number-whole? x))
+  (cond
+   ((and (>= x 0)        (< x bytes-kb))     'byte)
+   ((and (>= x bytes-kb) (< x bytes-mb)) 'kilobyte)
+   ((and (>= x bytes-mb) (< x bytes-gb)) 'megabyte)
+   ((and (>= x bytes-gb) (< x bytes-tb)) 'gigabyte)
+   ((and (>= x bytes-tb) (< x bytes-pb)) 'terabyte)
+   ((and (>= x bytes-pb) (< x bytes-eb)) 'petabyte)))
+
+(defun bytes-to-string (x)
+  "Convert integer X into a human-readable string."
+  (let ((base-and-unit
+         (pcase (bytes-classify x)
+           ('byte     (tuple/from        1 "B"))
+           ('kilobyte (tuple/from bytes-kb "KB"))
+           ('megabyte (tuple/from bytes-mb "MB"))
+           ('gigabyte (tuple/from bytes-gb "GB"))
+           ('terabyte (tuple/from bytes-tb "TB"))
+           ('petabyte (tuple/from bytes-pb "PB")))))
+    (string-format "%d%s"
+                   (round x (tuple/first base-and-unit))
+                   (tuple/second base-and-unit))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(progn
+  (prelude-assert
+   (equal "1000B" (bytes-to-string 1000)))
+  (prelude-assert
+   (equal "2KB" (bytes-to-string (* 2 bytes-kb))))
+  (prelude-assert
+   (equal "17MB" (bytes-to-string (* 17 bytes-mb))))
+  (prelude-assert
+   (equal "419GB" (bytes-to-string (* 419 bytes-gb))))
+  (prelude-assert
+   (equal "999TB" (bytes-to-string (* 999 bytes-tb))))
+  (prelude-assert
+   (equal "2PB" (bytes-to-string (* 2 bytes-pb)))))
+
+(provide 'bytes)
+;;; bytes.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/cache.el b/users/wpcarro/emacs/.emacs.d/wpc/cache.el
new file mode 100644
index 000000000000..be2049091c6d
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/cache.el
@@ -0,0 +1,89 @@
+;;; cache.el --- Caching things -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; An immutable cache data structure.
+;;
+;; This is like a sideways stack, that you can pull values out from and re-push
+;; to the top.  It'd be like a stack supporting push, pop, pull.
+;;
+;; This isn't a key-value data-structure like you might expect from a
+;; traditional cache.  The name is subject to change, but the underlying idea of
+;; a cache remains the same.
+;;
+;; Think about prescient.el, which uses essentially an LRU cache integrated into
+;; counsel to help create a "clairovoyant", self-organizing list.
+;;
+;; Use-cases:
+;; - Keeps an cache of workspaces sorted as MRU with an LRU eviction strategy.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'struct)
+(require '>)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct cache xs)
+
+;; TODO: Prefer another KBD for yasnippet form completion than company-mode's
+;; current KBD.
+
+(defun cache-from-list (xs)
+  "Turn list, XS, into a cache."
+  (make-cache :xs xs))
+
+(defun cache-contains? (x xs)
+  "Return t if X in XS."
+  (->> xs
+       cache-xs
+       (list-contains? x)))
+
+(defun cache-touch (x xs)
+  "Ensure value X in cache, XS, is front of the list.
+If X isn't in XS (using `equal'), insert it at the front."
+  (struct-update
+   cache
+   xs
+   (>-> (list-reject (lambda (y) (equal x y)))
+       (list-cons x))
+   xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(progn
+  (let ((cache (cache-from-list '("chicken" "nugget"))))
+    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+    ;; contains?/2
+    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+    (prelude-refute
+     (cache-contains? "turkey" cache))
+    (prelude-assert
+     (cache-contains? "chicken" cache))
+    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+    ;; touch/2
+    ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+    (prelude-assert
+     (equal
+      (cache-touch "nugget" cache)
+      (cache-from-list '("nugget" "chicken"))))
+    (prelude-assert
+     (equal
+      (cache-touch "spicy" cache)
+      (cache-from-list '("spicy" "chicken" "nugget"))))))
+
+(provide 'cache)
+;;; cache.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/clipboard.el b/users/wpcarro/emacs/.emacs.d/wpc/clipboard.el
new file mode 100644
index 000000000000..47cc459061e3
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/clipboard.el
@@ -0,0 +1,44 @@
+;;; clipboard.el --- Working with X11's pasteboard -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Simple functions for copying and pasting.
+;;
+;; Integrate with bburns/clipmon so that System Clipboard can integrate with
+;; Emacs's kill-ring.
+;;
+;; Wish list:
+;; - Create an Emacs integration with github.com/cdown/clipmenud.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defun clipboard-copy (x &key (message "[clipboard.el] Copied!"))
+  "Copy string, X, to X11's clipboard and `message' MESSAGE."
+  (kill-new x)
+  (message message))
+
+(cl-defun clipboard-paste (&key (message "[clipboard.el] Pasted!"))
+  "Paste contents of X11 clipboard and `message' MESSAGE."
+  (yank)
+  (message message))
+
+(defun clipboard-contents ()
+  "Return the contents of the clipboard as a string."
+  (substring-no-properties (current-kill 0)))
+
+(provide 'clipboard)
+;;; clipboard.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/colorscheme.el b/users/wpcarro/emacs/.emacs.d/wpc/colorscheme.el
new file mode 100644
index 000000000000..a02dc67c56a9
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/colorscheme.el
@@ -0,0 +1,86 @@
+;;; colorscheme.el --- Syntax highlight and friends -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;;
+;; TODO: Clarify this.
+;; Since I have my own definition of "theme", which couples wallpaper, font,
+;; with Emacs's traditional notion of the word "theme", I'm choosing to use
+;; "colorscheme" to refer to *just* the notion of syntax highlight etc.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'cycle)
+(require '>)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defcustom colorscheme-whitelist
+  (cycle-from-list
+   (->> (custom-available-themes)
+        (list-map #'symbol-name)
+        (list-filter (>-> (s-starts-with? "doom-")))
+        (list-map #'intern)))
+  "The whitelist of colorschemes through which to cycle.")
+
+(defun colorscheme-current ()
+  "Return the currently enabled colorscheme."
+  (cycle-current colorscheme-whitelist))
+
+(defun colorscheme-disable-all ()
+  "Disable all currently enabled colorschemes."
+  (interactive)
+  (->> custom-enabled-themes
+       (list-map #'disable-theme)))
+
+(defun colorscheme-set (theme)
+    "Call `load-theme' with `THEME', ensuring that the line numbers are bright.
+There is no hook that I'm aware of to handle this more elegantly."
+    (load-theme theme t)
+    (prelude-set-line-number-color "#da5468"))
+
+(defun colorscheme-whitelist-set (colorscheme)
+  "Focus the COLORSCHEME in the `colorscheme-whitelist' cycle."
+  (cycle-focus (lambda (x) (equal x colorscheme)) colorscheme-whitelist)
+  (colorscheme-set (colorscheme-current)))
+
+(defun colorscheme-ivy-select ()
+  "Load a colorscheme using ivy."
+  (interactive)
+  (let ((theme (ivy-read "Theme: " (cycle-to-list colorscheme-whitelist))))
+    (colorscheme-disable-all)
+    (colorscheme-set (intern theme))))
+
+(cl-defun colorscheme-cycle (&key forward?)
+  "Cycle next if `FORWARD?' is non-nil.
+Cycle prev otherwise."
+  (disable-theme (cycle-current colorscheme-whitelist))
+  (let ((theme (if forward?
+                   (cycle-next colorscheme-whitelist)
+                 (cycle-prev colorscheme-whitelist))))
+    (colorscheme-set theme)
+    (message (s-concat "Active theme: " (symbol-to-string theme)))))
+
+(defun colorscheme-next ()
+  "Disable the currently active theme and load the next theme."
+  (interactive)
+  (colorscheme-cycle :forward? t))
+
+(defun colorscheme-prev ()
+  "Disable the currently active theme and load the previous theme."
+  (interactive)
+  (colorscheme-cycle :forward? nil))
+
+(provide 'colorscheme)
+;;; colorscheme.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/constants.el b/users/wpcarro/emacs/.emacs.d/wpc/constants.el
new file mode 100644
index 000000000000..ae21a089cc05
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/constants.el
@@ -0,0 +1,55 @@
+;;; constants.el --- Constants for organizing my Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This file contains constants that are shared across my configuration.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'f)
+(require 'maybe)
+
+(prelude-assert (f-exists? (getenv "BRIEFCASE")))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst constants-ci?
+  (maybe-some? (getenv "CI"))
+  "Encoded as t when Emacs is running in CI.")
+
+(defconst constants-briefcase
+  (getenv "BRIEFCASE")
+  "Path to my monorepo, which various parts of my configuration rely on.")
+
+;; TODO: Consider merging `ui.el' and `misc.el' because those are the only
+;; current consumers of these constants, and I'm unsure if the indirection that
+;; globally defined constants introduces is worth it.
+
+(defconst constants-current-project
+  constants-briefcase
+  "Variable holding the directory for my currently active project.")
+
+(defconst constants-mouse-kbds
+  '([mouse-1] [down-mouse-1] [drag-mouse-1] [double-mouse-1] [triple-mouse-1]
+    [mouse-2] [down-mouse-2] [drag-mouse-2] [double-mouse-2] [triple-mouse-2]
+    [mouse-3] [down-mouse-3] [drag-mouse-3] [double-mouse-3] [triple-mouse-3]
+    [mouse-4] [down-mouse-4] [drag-mouse-4] [double-mouse-4] [triple-mouse-4]
+    [mouse-5] [down-mouse-5] [drag-mouse-5] [double-mouse-5] [triple-mouse-5])
+  "All of the mouse-related keybindings that Emacs recognizes.")
+
+(defconst constants-fill-column 80
+  "Variable used to set the defaults for wrapping, highlighting, etc.")
+
+(provide 'constants)
+;;; constants.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/cycle.el b/users/wpcarro/emacs/.emacs.d/wpc/cycle.el
new file mode 100644
index 000000000000..5ea015930017
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/cycle.el
@@ -0,0 +1,224 @@
+;;; cycle.el --- Simple module for working with cycles -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Something like this may already exist, but I'm having trouble finding it, and
+;; I think writing my own is a nice exercise for learning more Elisp.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'math)
+(require 'maybe)
+(require 'struct)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Wish list
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; - TODO: Provide immutable variant.
+;; - TODO: Replace mutable consumption with immutable variant.
+;; - TODO: Replace indexing with (math-mod current cycle).
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; `current-index' tracks the current index
+;; `xs' is the original list
+(cl-defstruct cycle current-index previous-index xs)
+
+(defconst cycle-enable-tests? t
+  "When t, run the tests defined herein.")
+
+(defun cycle-from-list (xs)
+  "Create a cycle from a list of `XS'."
+  (if (= 0 (length xs))
+      (make-cycle :current-index nil
+                  :previous-index nil
+                  :xs xs)
+    (make-cycle :current-index 0
+                :previous-index nil
+                :xs xs)))
+
+(defun cycle-new (&rest xs)
+  "Create a cycle with XS as the values."
+  (cycle-from-list xs))
+
+(defun cycle-to-list (xs)
+  "Return the list representation of a cycle, XS."
+  (cycle-xs xs))
+
+(defun cycle--next-index<- (lo hi x)
+  "Return the next index in a cycle when moving downwards.
+- `LO' is the lower bound.
+- `HI' is the upper bound.
+- `X' is the current index."
+  (if (< (- x 1) lo)
+      (- hi 1)
+    (- x 1)))
+
+(defun cycle--next-index-> (lo hi x)
+  "Return the next index in a cycle when moving upwards.
+- `LO' is the lower bound.
+- `HI' is the upper bound.
+- `X' is the current index."
+  (if (>= (+ 1 x) hi)
+      lo
+    (+ 1 x)))
+
+(defun cycle-previous-focus (cycle)
+  "Return the previously focused entry in CYCLE."
+  (let ((i (cycle-previous-index cycle)))
+    (if (maybe-some? i)
+        (nth i (cycle-xs cycle))
+      nil)))
+
+;; TODO: Consider adding "!" to the function name herein since many of them
+;; mutate the collection, and the APIs are beginning to confuse me.
+(defun cycle-focus-previous! (xs)
+  "Jump to the item in XS that was most recently focused; return the cycle.
+This will error when previous-index is nil.  This function mutates the
+underlying struct."
+  (let ((i (cycle-previous-index xs)))
+    (if (maybe-some? i)
+        (progn
+          (cycle-jump i xs)
+          (cycle-current xs))
+      (error "Cannot focus the previous element since cycle-previous-index is nil"))))
+
+(defun cycle-next (xs)
+  "Return the next value in `XS' and update `current-index'."
+  (let* ((current-index (cycle-current-index xs))
+         (next-index (cycle--next-index-> 0 (cycle-count xs) current-index)))
+    (struct-set! cycle previous-index current-index xs)
+    (struct-set! cycle current-index next-index xs)
+    (nth next-index (cycle-xs xs))))
+
+(defun cycle-prev (xs)
+  "Return the previous value in `XS' and update `current-index'."
+  (let* ((current-index (cycle-current-index xs))
+         (next-index (cycle--next-index<- 0 (cycle-count xs) current-index)))
+    (struct-set! cycle previous-index current-index xs)
+    (struct-set! cycle current-index next-index xs)
+    (nth next-index (cycle-xs xs))))
+
+(defun cycle-current (cycle)
+  "Return the current value in `CYCLE'."
+  (nth (cycle-current-index cycle) (cycle-xs cycle)))
+
+(defun cycle-count (cycle)
+  "Return the length of `xs' in `CYCLE'."
+  (length (cycle-xs cycle)))
+
+(defun cycle-jump (i xs)
+  "Jump to the I index of XS."
+  (let ((current-index (cycle-current-index xs))
+        (next-index (math-mod i (cycle-count xs))))
+    (struct-set! cycle previous-index current-index xs)
+    (struct-set! cycle current-index next-index xs))
+  xs)
+
+(defun cycle-focus (p cycle)
+  "Focus the element in CYCLE for which predicate, P, is t."
+  (let ((i (->> cycle
+                cycle-xs
+                (-find-index p))))
+    (if i
+        (cycle-jump i cycle)
+      (error "No element in cycle matches predicate"))))
+
+(defun cycle-focus-item (x xs)
+  "Focus item, X, in cycle XS.
+ITEM is the first item in XS that t for `equal'."
+  (cycle-focus (lambda (y) (equal x y)) xs))
+
+(defun cycle-contains? (x xs)
+  "Return t if cycle, XS, has member X."
+  (->> xs
+       cycle-xs
+       (list-contains? x)))
+
+(defun cycle-empty? (xs)
+  "Return t if cycle XS has no elements."
+  (= 0 (length (cycle-xs xs))))
+
+(defun cycle-focused? (xs)
+  "Return t if cycle XS has a non-nil value for current-index."
+  (maybe-some? (cycle-current-index xs)))
+
+(defun cycle-append (x xs)
+  "Add X to the left of the focused element in XS.
+If there is no currently focused item, add X to the beginning of XS."
+  (if (cycle-empty? xs)
+      (progn
+        (struct-set! cycle xs (list x) xs)
+        (struct-set! cycle current-index 0 xs)
+        (struct-set! cycle previous-index nil xs))
+    (let ((curr-i (cycle-current-index xs))
+          (prev-i (cycle-previous-index xs)))
+      (if curr-i
+          (progn
+            (struct-set! cycle xs (-insert-at curr-i x (cycle-xs xs)) xs)
+            (when (>= prev-i curr-i) (struct-set! cycle previous-index (1+ prev-i) xs))
+            (when curr-i (struct-set! cycle current-index (1+ curr-i) xs)))
+        (progn
+          (struct-set! cycle xs (cons x (cycle-xs xs)) xs)
+          (when prev-i (struct-set! cycle previous-index (1+ prev-i) xs))))
+      xs)))
+
+(defun cycle-remove (x xs)
+  "Attempt to remove X from XS.
+
+X is found using `equal'.
+
+If X is the currently focused value, after it's deleted, current-index will be
+  nil.  If X is the previously value, after it's deleted, previous-index will be
+  nil."
+  (let ((curr-i (cycle-current-index xs))
+        (prev-i (cycle-previous-index xs))
+        (rm-i (-elem-index x (cycle-xs xs))))
+    (struct-set! cycle xs (-remove-at rm-i (cycle-xs xs)) xs)
+    (when prev-i
+      (when (> prev-i rm-i) (struct-set! cycle previous-index (1- prev-i) xs))
+      (when (= prev-i rm-i) (struct-set! cycle previous-index nil xs)))
+    (when curr-i
+      (when (> curr-i rm-i) (struct-set! cycle current-index (1- curr-i) xs))
+      (when (= curr-i rm-i) (struct-set! cycle current-index nil xs)))
+    xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when cycle-enable-tests?
+  (let ((xs (cycle-new 1 2 3)))
+    (prelude-assert (maybe-nil? (cycle-previous-focus xs)))
+    (prelude-assert (= 1 (cycle-current xs)))
+    (prelude-assert (= 2 (cycle-next xs)))
+    (prelude-assert (= 1 (cycle-previous-focus xs)))
+    (prelude-assert (= 1 (->> xs (cycle-jump 0) cycle-current)))
+    (prelude-assert (= 2 (->> xs (cycle-jump 1) cycle-current)))
+    (prelude-assert (= 3 (->> xs (cycle-jump 2) cycle-current)))
+    (prelude-assert (= 2 (cycle-previous-focus xs)))
+    (prelude-assert (= 2 (cycle-focus-previous! xs)))
+    (prelude-assert (equal '(1 4 2 3) (cycle-xs (cycle-append 4 xs))))
+    (prelude-assert (equal '(1 2 3) (cycle-xs (cycle-remove 4 xs))))
+    (progn
+      (cycle-focus-item 3 xs)
+      (cycle-focus-item 2 xs)
+      (cycle-remove 1 xs)
+      (prelude-assert (= 2 (cycle-current xs)))
+      (prelude-assert (= 3 (cycle-previous-focus xs))))))
+
+(provide 'cycle)
+;;; cycle.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/device.el b/users/wpcarro/emacs/.emacs.d/wpc/device.el
new file mode 100644
index 000000000000..0e7992fd79e7
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/device.el
@@ -0,0 +1,50 @@
+;;; device.el --- Physical device information -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Functions for querying device information.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'dash)
+(require 'al)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst device-hostname->device
+  '(("zeno.lon.corp.google.com" . work-desktop)
+    ("seneca" . work-laptop))
+  "Mapping hostname to a device symbol.")
+
+;; TODO: Should I generate these predicates?
+
+(defun device-classify ()
+  "Return the device symbol for the current host or nil if not supported."
+  (al-get system-name device-hostname->device))
+
+(defun device-work-laptop? ()
+  "Return t if current device is work laptop."
+  (equal 'work-laptop
+         (device-classify)))
+
+(defun device-work-desktop? ()
+  "Return t if current device is work desktop."
+  (equal 'work-desktop
+         (device-classify)))
+
+(defun device-corporate? ()
+  "Return t if the current device is owned by my company."
+  (or (device-work-laptop?) (device-work-desktop?)))
+
+(provide 'device)
+;;; device.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/display.el b/users/wpcarro/emacs/.emacs.d/wpc/display.el
new file mode 100644
index 000000000000..24c00e3f73ea
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/display.el
@@ -0,0 +1,138 @@
+;;; display.el --- Working with single or multiple displays -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Mostly wrappers around xrandr.
+;;
+;; Troubleshooting:
+;; The following commands help me when I (infrequently) interact with xrandr.
+;; - xrandr --listmonitors
+;; - xrandr --query
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'dash)
+(require 's)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defmacro display-register (name &key
+                                    output
+                                    primary
+                                    coords
+                                    size
+                                    rate
+                                    dpi
+                                    rotate)
+  "Macro to define constants and two functions for {en,dis}abling a display.
+
+NAME    - the human-readable identifier for the display
+OUTPUT  - the xrandr identifier for the display
+PRIMARY - if true, send --primary flag to xrandr
+COORDS  - X and Y offsets
+SIZE    - the pixel resolution of the display (width height)
+RATE    - the refresh rate
+DPI     - the pixel density in dots per square inch
+rotate  - one of {normal,left,right,inverted}
+
+See the man-page for xrandr for more details."
+  `(progn
+     (defconst ,(intern (format "display-%s" name)) ,output
+       ,(format "The xrandr identifier for %s" name))
+     (defconst ,(intern (format "display-%s-args" name))
+       ,(replace-regexp-in-string
+         "\s+" " "
+         (s-format "--output ${output} ${primary-flag} --auto \
+                    --size ${size-x}x${size-y} --rate ${rate} --dpi ${dpi} \
+                    --rotate ${rotate} ${pos-flag}"
+                   #'aget
+                   `(("output" . ,output)
+                     ("primary-flag" . ,(if primary "--primary" "--noprimary"))
+                     ("pos-flag" . ,(if coords
+                                        (format "--pos %dx%d"
+                                                (car coords)
+                                                (cadr coords))
+                                      ""))
+                     ("size-x" . ,(car size))
+                     ("size-y" . ,(cadr size))
+                     ("rate" . ,rate)
+                     ("dpi" . ,dpi)
+                     ("rotate" . ,rotate))))
+       ,(format "The arguments we pass to xrandr for display-%s." name))
+     (defconst ,(intern (format "display-%s-command" name))
+       (format "xrandr %s" ,(intern (format "display-%s-args" name)))
+       ,(format "The command we run to configure %s" name))
+     (defun ,(intern (format "display-enable-%s" name)) ()
+       ,(format "Attempt to enable my %s monitor" name)
+       (interactive)
+       (prelude-start-process
+        :name ,(format "display-enable-%s" name)
+        :command ,(intern (format "display-%s-command" name))))
+     (defun ,(intern (format "display-disable-%s" name)) ()
+       ,(format "Attempt to disable my %s monitor." name)
+       (interactive)
+       (prelude-start-process
+        :name ,(format "display-disable-%s" name)
+        :command ,(format
+                   "xrandr --output %s --off"
+                   output)))))
+
+(defmacro display-arrangement (name &key displays)
+  "Create a function, display-arrange-<NAME>, to enable all your DISPLAYS."
+  `(defun ,(intern (format "display-arrange-%s" name)) ()
+     (interactive)
+     (prelude-start-process
+      :name ,(format "display-configure-%s" name)
+      :command ,(format "xrandr %s"
+                        (->> displays
+                             (-map (lambda (x)
+                                     (eval (intern (format "display-%s-args" x)))))
+                             (s-join " "))))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(display-register laptop
+                  :output "eDP1"
+                  :primary nil
+                  :coords (2560 1440)
+                  :size (1920 1080)
+                  :rate 30.0
+                  :dpi 144
+                  :rotate normal)
+
+(display-register 4k-horizontal
+                  :output "DP2"
+                  :primary t
+                  :coords (0 0)
+                  :size (2560 1440)
+                  :rate 30.0
+                  :dpi 144
+                  :rotate normal)
+
+(display-register 4k-vertical
+                  :output "HDMI1"
+                  :primary nil
+                  :coords (-1440 -560)
+                  :size (2560 1440)
+                  :rate 30.0
+                  :dpi 144
+                  :rotate left)
+
+(display-arrangement primary
+                     :displays (laptop 4k-horizontal 4k-vertical))
+
+(provide 'display)
+;;; display.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/dotted.el b/users/wpcarro/emacs/.emacs.d/wpc/dotted.el
new file mode 100644
index 000000000000..f400affd6ec6
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/dotted.el
@@ -0,0 +1,58 @@
+;;; dotted.el --- Working with dotted pairs in Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Part of my primitives library extensions in Elisp.  Contrast my primitives
+;; with the wrapper extensions that I provide, which expose immutable variants
+;; of data structures like an list, alist, tuple, as well as quasi-typeclasses
+;; like sequence, etc.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'macros)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defun dotted-new (&optional a b)
+  "Create a new dotted pair of A and B."
+  (cons a b))
+
+(defun dotted-instance? (x)
+  "Return t if X is a dotted pair."
+  (let ((b (cdr x)))
+    (and b (atom b))))
+
+(defun dotted-first (x)
+  "Return the first element of X."
+  (car x))
+
+(defun dotted-second (x)
+  "Return the second element of X."
+  (cdr x))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(progn
+  (prelude-assert
+   (equal '(fname . "Bob") (dotted-new 'fname "Bob")))
+  (prelude-assert
+   (dotted-instance? '(one . two)))
+  (prelude-refute
+   (dotted-instance? '(1 2 3))))
+
+(provide 'dotted)
+;;; dotted.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/email.el b/users/wpcarro/emacs/.emacs.d/wpc/email.el
new file mode 100644
index 000000000000..ef5d7c9534ed
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/email.el
@@ -0,0 +1,77 @@
+;;; email.el --- My email settings -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Attempting to configure to `notmuch' for my personal use.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'notmuch)
+(require 'list)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(setq notmuch-saved-searches
+      '((:name "inbox" :query "tag:inbox" :key "i")
+        (:name "direct"
+         :query "tag:direct and tag:unread and not tag:sent"
+         :key "d")
+        (:name "action" :query "tag:action" :key "a")
+        (:name "review" :query "tag:review" :key "r")
+        (:name "waiting" :query "tag:waiting" :key "w")
+        (:name "broadcast" :query "tag:/broadcast\/.+/ and tag:unread" :key "b")
+        (:name "systems" :query "tag:/systems\/.+/ and tag:unread" :key "s")
+        (:name "sent" :query "tag:sent" :key "t")
+        (:name "drafts" :query "tag:draft" :key "D")))
+
+;; Sort results from newest-to-oldest.
+(setq notmuch-search-oldest-first nil)
+
+;; Discard noisy email signatures.
+(setq notmuch-mua-cite-function #'message-cite-original-without-signature)
+
+;; By default, this is just '("-inbox")
+(setq notmuch-archive-tags '("-inbox" "-unread" "+archive"))
+
+;; Show saved searches even when they're empty.
+(setq notmuch-show-empty-saved-searches t)
+
+;; Currently the sendmail executable on my system is symlinked to msmtp.
+(setq send-mail-function #'sendmail-send-it)
+
+;; I'm not sure if I need this or not. Copying it from tazjin@'s monorepo.
+(setq notmuch-always-prompt-for-sender nil)
+
+;; Add the "User-Agent" header to my emails and ensure that it includes Emacs
+;; and notmuch information.
+(setq notmuch-mua-user-agent-function
+      (lambda ()
+        (format "Emacs %s; notmuch.el %s" emacs-version notmuch-emacs-version)))
+
+;; I was informed that Gmail does this server-side
+(setq notmuch-fcc-dirs nil)
+
+;; Ensure buffers are closed after sending mail.
+(setq message-kill-buffer-on-exit t)
+
+;; Ensure sender is correctly passed to msmtp.
+(setq mail-specify-envelope-from t
+      message-sendmail-envelope-from 'header
+      mail-envelope-from 'header)
+
+;; Assert that no two saved searches share share a KBD
+(prelude-assert
+ (list-xs-distinct-by? (lambda (x) (plist-get x :key)) notmuch-saved-searches))
+
+(provide 'email)
+;;; email.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/fonts.el b/users/wpcarro/emacs/.emacs.d/wpc/fonts.el
new file mode 100644
index 000000000000..ad77b512d78e
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/fonts.el
@@ -0,0 +1,172 @@
+;;; fonts.el --- Font preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Control my font preferences with ELisp.
+
+;;; Code:
+
+;; TODO: `defcustom' font-size.
+;; TODO: `defcustom' fonts.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'cycle)
+(require 'device)
+(require 'maybe)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Troubleshoot why "8" appears so large on my desktop.
+
+;; TODO: Consider having a different font size when I'm using my 4K monitor.
+
+(defconst fonts-size
+  (pcase (device-classify)
+    ('work-laptop "10")
+    ('work-desktop "10"))
+  "My preferred default font-size, which is device specific.")
+
+(defconst fonts-size-step 10
+  "The amount (%) by which to increase or decrease a font.")
+
+(defconst fonts-hacker-news-recommendations
+  '("APL385 Unicode"
+    "Go Mono"
+    "Sudo"
+    "Monoid"
+    "Input Mono Medium" ;; NOTE: Also "Input Mono Thin" is nice.
+    )
+  "List of fonts optimized for programming I found in a HN article.")
+
+(defconst fonts-whitelist
+  (cycle-from-list
+   (list-concat
+    fonts-hacker-news-recommendations
+    '("JetBrainsMono"
+      "Mononoki Medium"
+      "Monospace"
+      "Operator Mono Light"
+      "Courier"
+      "Andale Mono"
+      "Source Code Pro"
+      "Terminus")))
+  "This is a list of my preferred fonts.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: fonts and fonts-whitelist make it difficult to name functions like
+;; fonts-set as a generic Emacs function vs choosing a font from the whitelist.
+
+(cl-defun fonts-cycle (&key forward?)
+  "Cycle forwards when `FORWARD?' non-nil."
+  (let ((font (if forward?
+                  (cycle-next fonts-whitelist)
+                (cycle-prev fonts-whitelist))))
+    (message (s-concat "Active font: " font))
+    (fonts-set font)))
+
+(defun fonts-next ()
+  "Quickly cycle through preferred fonts."
+  (interactive)
+  (fonts-cycle :forward? t))
+
+(defun fonts-prev ()
+  "Quickly cycle through preferred fonts."
+  (interactive)
+  (fonts-cycle :forward? nil))
+
+(defun fonts-set (font &optional size)
+  "Change the font to `FONT' with option integer, SIZE, in pixels."
+  (if (maybe-some? size)
+      (set-frame-font (string-format "%s %s" font size) nil t)
+    (set-frame-font font nil t)))
+
+(defun fonts-whitelist-set (font)
+  "Focuses the FONT in the `fonts-whitelist' cycle.
+The size of the font is determined by `fonts-size'."
+  (prelude-assert (cycle-contains? font fonts-whitelist))
+  (cycle-focus (lambda (x) (equal x font)) fonts-whitelist)
+  (fonts-set (fonts-current) fonts-size))
+
+(defun fonts-ivy-select ()
+  "Select a font from an ivy prompt."
+  (interactive)
+  (fonts-whitelist-set
+   (ivy-read "Font: " (cycle-to-list fonts-whitelist))))
+
+(defun fonts-print-current ()
+  "Message the currently enabled font."
+  (interactive)
+  (message
+   (string-format "[fonts] Current font: \"%s\""
+                  (fonts-current))))
+
+(defun fonts-current ()
+  "Return the currently enabled font."
+  (cycle-current fonts-whitelist))
+
+(defun fonts-increase-size ()
+  "Increase font size."
+  (interactive)
+  (->> (face-attribute 'default :height)
+       (+ fonts-size-step)
+       (set-face-attribute 'default (selected-frame) :height)))
+
+(defun fonts-decrease-size ()
+  "Decrease font size."
+  (interactive)
+  (->> (face-attribute 'default :height)
+       (+ (- fonts-size-step))
+       (set-face-attribute 'default (selected-frame) :height)))
+
+(defun fonts-reset-size ()
+  "Restore font size to its default value."
+  (interactive)
+  (fonts-whitelist-set (fonts-current)))
+
+(defun fonts-enable-ligatures ()
+  "Call this function to enable ligatures."
+  (interactive)
+  (let ((alist '((33 . ".\\(?:\\(?:==\\|!!\\)\\|[!=]\\)")
+                 (35 . ".\\(?:###\\|##\\|_(\\|[#(?[_{]\\)") ;;
+                 (36 . ".\\(?:>\\)")
+                 (37 . ".\\(?:\\(?:%%\\)\\|%\\)")
+                 (38 . ".\\(?:\\(?:&&\\)\\|&\\)")
+                 (42 . ".\\(?:\\(?:\\*\\*/\\)\\|\\(?:\\*[*/]\\)\\|[*/>]\\)") ;;
+                 (43 . ".\\(?:\\(?:\\+\\+\\)\\|[+>]\\)")
+                 (45 . ".\\(?:\\(?:-[>-]\\|<<\\|>>\\)\\|[<>}~-]\\)")
+                 (46 . ".\\(?:\\(?:\\.[.<]\\)\\|[.=-]\\)") ;;
+                 (47 . ".\\(?:\\(?:\\*\\*\\|//\\|==\\)\\|[*/=>]\\)")
+                 (48 . ".\\(?:x[a-zA-Z]\\)")
+                 (58 . ".\\(?:::\\|[:=]\\)")
+                 (59 . ".\\(?:;;\\|;\\)")
+                 (60 . ".\\(?:\\(?:!--\\)\\|\\(?:~~\\|->\\|\\$>\\|\\*>\\|\\+>\\|--\\|<[<=-]\\|=[<=>]\\||>\\)\\|[*$+~/<=>|-]\\)")
+                 (61 . ".\\(?:\\(?:/=\\|:=\\|<<\\|=[=>]\\|>>\\)\\|[<=>~]\\)")
+                 (62 . ".\\(?:\\(?:=>\\|>[=>-]\\)\\|[=>-]\\)")
+                 (63 . ".\\(?:\\(\\?\\?\\)\\|[:=?]\\)")
+                 (91 . ".\\(?:]\\)")
+                 (92 . ".\\(?:\\(?:\\\\\\\\\\)\\|\\\\\\)")
+                 (94 . ".\\(?:=\\)")
+                 (119 . ".\\(?:ww\\)")
+                 (123 . ".\\(?:-\\)")
+                 (124 . ".\\(?:\\(?:|[=|]\\)\\|[=>|]\\)")
+                 (126 . ".\\(?:~>\\|~~\\|[>=@~-]\\)"))))
+    (dolist (char-regexp alist)
+      (set-char-table-range composition-function-table (car char-regexp)
+                            `([,(cdr char-regexp) 0 font-shape-gstring])))))
+
+(provide 'fonts)
+;;; fonts.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/fs.el b/users/wpcarro/emacs/.emacs.d/wpc/fs.el
new file mode 100644
index 000000000000..2f83019fd4c9
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/fs.el
@@ -0,0 +1,70 @@
+;;; fs.el --- Make working with the filesystem easier -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.1"))
+
+;;; Commentary:
+;; Ergonomic alternatives for working with the filesystem.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'dash)
+(require 'f)
+(require 's)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun fs-ensure-file (path)
+  "Ensure that a file and its directories in `PATH' exist.
+Will error for inputs with a trailing slash."
+  (when (s-ends-with? "/" path)
+    (error (format "Input path has trailing slash: %s" path)))
+  (->> path
+       f-dirname
+       fs-ensure-dir)
+  (f-touch path))
+
+(f-dirname "/tmp/a/b/file.txt")
+
+(defun fs-ensure-dir (path)
+  "Ensure that a directory and its ancestor directories in `PATH' exist."
+  (->> path
+       f-split
+       (apply #'f-mkdir)))
+
+(defun fs-ls (dir &optional full-path?)
+  "List the files in `DIR' one-level deep.
+Should behave similarly in spirit to the Unix command, ls.
+If `FULL-PATH?' is set, return the full-path of the files."
+  (-drop 2 (directory-files dir full-path?)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(ert-deftest fs-test-ensure-file ()
+  (let ((file "/tmp/file/a/b/c/file.txt"))
+    ;; Ensure this file doesn't exist first to prevent false-positives.
+    (f-delete file t)
+    (fs-ensure-file file)
+    (should (and (f-exists? file)
+                 (f-file? file)))))
+
+(ert-deftest fs-test-ensure-dir ()
+  (let ((dir "/tmp/dir/a/b/c"))
+    ;; Ensure the directory doesn't exist.
+    (f-delete dir t)
+    (fs-ensure-dir dir)
+    (should (and (f-exists? dir)
+                 (f-dir? dir)))))
+
+(provide 'fs)
+;;; fs.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/functions.el b/users/wpcarro/emacs/.emacs.d/wpc/functions.el
new file mode 100644
index 000000000000..c0b873aaff14
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/functions.el
@@ -0,0 +1,47 @@
+;;; functions.el --- Helper functions -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This file hopefully contains friendly APIs that making ELisp development more
+;; enjoyable.
+
+;; TODO: Break these out into separate modules.
+
+;;; Code:
+(defun functions-evil-window-vsplit-right ()
+  "Split the window vertically and focus the right half."
+  (interactive)
+  (evil-window-vsplit)
+  (windmove-right))
+
+(defun functions-evil-window-split-down ()
+  "Split the window horizontal and focus the bottom half."
+  (interactive)
+  (evil-window-split)
+  (windmove-down))
+
+(defun functions-create-snippet ()
+  "Create a window split and then opens the Yasnippet editor."
+  (interactive)
+  (evil-window-vsplit)
+  (call-interactively #'yas-new-snippet))
+
+(defun functions-evil-replace-under-point ()
+  "Faster than typing %s//thing/g."
+  (interactive)
+  (let ((term (s-replace "/" "\\/" (symbol-to-string (symbol-at-point)))))
+    (save-excursion
+      (evil-ex (concat "%s/\\b" term "\\b/")))))
+
+(defun functions-buffer-dirname ()
+  "Return the directory name of the current buffer as a string."
+  (->> buffer-file-name
+       f-dirname
+       f-filename))
+
+(provide 'functions)
+;;; functions.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/graph.el b/users/wpcarro/emacs/.emacs.d/wpc/graph.el
new file mode 100644
index 000000000000..9965622bb6d7
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/graph.el
@@ -0,0 +1,95 @@
+;;; graph.el --- Working with in-memory graphs -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;;
+;; Remember that there are optimal three ways to model a graph:
+;; 1. Edge List
+;; 2. Vertex Table (a.k.a. Neighbors Table)
+;; 3. Adjacency Matrix
+;;
+;; I may call these "Edges", "Neighbors", "Adjacencies" to avoid verbose naming.
+;; For now, I'm avoiding dealing with Adjacency Matrices as I don't have an
+;; immediate use-case for them.  This is subject to change.
+;;
+;; There are also hybrid representations of graphs that combine the three
+;; aforementioned models.  I believe Erlang's digraph module models graphs in
+;; Erlang Term Storage (i.e. ETS) this way.
+;; TODO: Verify this claim.
+;;
+;; Graphs can be weighted or unweighted.  They can also be directed or
+;; undirected.
+;; TODO: Create a table explaining all graph variants.
+;;
+;; TODO: Figure out the relationship of this module and tree.el, which should in
+;; principle overlap.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; For now, I'll support storing *either* neighbors or edges in the graph struct
+;; as long as both aren't set, since that introduces consistency issues.  I may
+;; want to handle that use-case in the future, but not now.
+(cl-defstruct graph neighbors edges)
+
+;; TODO: How do you find the starting point for a topo sort?
+(defun graph-sort (xs)
+  "Return a topological sort of XS.")
+
+(defun graph-from-edges (xs)
+  "Create a graph struct from the Edge List, XS.
+The user must pass in a valid Edge List since asserting on the shape of XS might
+  be expensive."
+  (make-graph :edges xs))
+
+(defun graph-from-neighbors (xs)
+  "Create a graph struct from a Neighbors Table, XS.
+The user must pass in a valid Neighbors Table since asserting on the shape of
+  XS might be expensive."
+  (make-graph :neighbors xs))
+
+(defun graph-instance? (xs)
+  "Return t if XS is a graph struct."
+  (graph-p xs))
+
+;; TODO: Model each of the mapping functions into an isomorphism.
+(defun graph-edges->neighbors (xs)
+  "Map Edge List, XS, into a Neighbors Table."
+  (prelude-assert (graph-instance? xs)))
+
+(defun graph-neighbors->edges (xs)
+  "Map Neighbors Table, XS, into an Edge List."
+  (prelude-assert (graph-instance? xs)))
+
+;; Below are three different models of the same unweighted, directed graph.
+
+(defvar graph-edges
+  '((a . b) (a . c) (a . e)
+    (b . c) (b . d)
+    (c . e)
+    (d . f)
+    (e . d) (e . f)))
+
+(defvar graph-neighbors
+  ((a b c e)
+   (b c d)
+   (c e)
+   (d f)
+   (e d g)
+   (f)))
+
+(provide 'graph)
+;;; graph.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/irc.el b/users/wpcarro/emacs/.emacs.d/wpc/irc.el
new file mode 100644
index 000000000000..f221db9eb9e0
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/irc.el
@@ -0,0 +1,171 @@
+;;; irc.el --- Configuration for IRC chat -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Need to decide which client I will use for IRC.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'erc)
+(require 'cycle)
+(require 'string)
+(require 'prelude)
+(require 'al)
+(require 'set)
+(require 'maybe)
+(require 'macros)
+(require '>)
+(require 'password-store)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defcustom irc-install-kbds? t
+  "When t, install the keybindings defined herein.")
+
+(setq erc-rename-buffers t)
+
+;; Setting `erc-join-buffer' to 'bury prevents erc from stealing focus of the
+;; current buffer when it connects to IRC servers.
+(setq erc-join-buffer 'bury)
+
+;; TODO: Find a way to avoid putting "freenode" and "#freenode" as channels
+;; here.  I'm doing it because when erc first connects, it's `(buffer-name)' is
+;; "freenode", so when `irc-next-channel' is called, it 404s on the
+;; `cycle-contains?' call in `irc-channel->cycle" unless "freenode" is there. To
+;; make matters even uglier, when `erc-join-channel' is called with "freenode"
+;; as the value, it connects to the "#freenode" channel, so unless "#freenode"
+;; exists in this cycle also, `irc-next-channel' breaks again.
+(defconst irc-server->channels
+  `(("irc.freenode.net"    . ,(cycle-new "freenode" "#freenode" "#nixos" "#emacs" "#pass"))
+    ("irc.corp.google.com" . ,(cycle-new "#drive-prod")))
+  "Mapping of IRC servers to a cycle of my preferred channels.")
+
+;; TODO: Here is another horrible hack that should be revisted.
+(setq erc-autojoin-channels-alist
+      (->> irc-server->channels
+           (al-map-values #'cycle-to-list)
+           (al-map-keys (>-> (s-chop-prefix "irc.")
+                             (s-chop-suffix ".net")))))
+
+;; TODO: Assert that no two servers have a channel with the same name. We need
+;; this because that's the assumption that underpins the `irc-channel->server'
+;; function. This will probably be an O(n^2) operation.
+(prelude-assert
+ (set-distinct? (set-from-list
+                 (cycle-to-list
+                  (al-get "irc.freenode.net"
+                          irc-server->channels)))
+                (set-from-list
+                 (cycle-to-list
+                  (al-get "irc.corp.google.com"
+                          irc-server->channels)))))
+
+(defun irc-channel->server (server->channels channel)
+  "Using SERVER->CHANNELS, resolve an IRC server from a given CHANNEL."
+  (let ((result (al-find (lambda (k v) (cycle-contains? channel v))
+                         server->channels)))
+    (prelude-assert (maybe-some? result))
+    result))
+
+(defun irc-channel->cycle (server->channels channel)
+  "Using SERVER->CHANNELS, resolve an IRC's channels cycle from CHANNEL."
+  (al-get (irc-channel->server server->channels channel)
+          server->channels))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun irc-message (x)
+  "Print message X in a structured way."
+  (message (string-format "[irc.el] %s" x)))
+
+;; TODO: Integrate Google setup with Freenode setup.
+
+;; TODO: Support function or KBD for switching to an ERC buffer.
+
+(defun irc-kill-all-erc-processes ()
+  "Kill all ERC buffers and processes."
+  (interactive)
+  (->> (erc-buffer-list)
+       (-map #'kill-buffer)))
+
+(defun irc-switch-to-erc-buffer ()
+  "Switch to an ERC buffer."
+  (interactive)
+  (let ((buffers (erc-buffer-list)))
+    (if (list-empty? buffers)
+        (error "[irc.el] No ERC buffers available")
+      (switch-to-buffer (list-head (erc-buffer-list))))))
+
+(defun irc-connect-to-freenode ()
+  "Connect to Freenode IRC."
+  (interactive)
+  (erc-ssl :server "irc.freenode.net"
+           :port 6697
+           :nick "wpcarro"
+           :password (password-store-get "programming/irc/freenode")
+           :full-name "William Carroll"))
+
+;; TODO: Handle failed connections.
+(defun irc-connect-to-google ()
+  "Connect to Google's Corp IRC using ERC."
+  (interactive)
+  (erc-ssl :server "irc.corp.google.com"
+           :port 6697
+           :nick "wpcarro"
+           :full-name "William Carroll"))
+
+;; TODO: Prefer defining these with a less homespun solution. There is a
+;; function call `erc-buffer-filter' that would be more appropriate for the
+;; implementation of `irc-next-channel' and `irc-prev-channel'.
+(defun irc-next-channel ()
+  "Join the next channel for the active server."
+  (interactive)
+  (with-current-buffer (current-buffer)
+    (let ((cycle (irc-channel->cycle irc-server->channels (buffer-name))))
+      (erc-join-channel
+       (cycle-next cycle))
+      (irc-message
+       (string-format "Current IRC channel: %s" (cycle-current cycle))))))
+
+(defun irc-prev-channel ()
+  "Join the previous channel for the active server."
+  (interactive)
+  (with-current-buffer (current-buffer)
+    (let ((cycle (irc-channel->cycle irc-server->channels (buffer-name))))
+      (erc-join-channel
+       (cycle-prev cycle))
+      (irc-message
+       (string-format "Current IRC channel: %s" (cycle-current cycle))))))
+
+(add-hook 'erc-mode-hook (macros-disable auto-fill-mode))
+(add-hook 'erc-mode-hook (macros-disable company-mode))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Keybindings
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when irc-install-kbds?
+  (general-define-key
+   :keymaps 'erc-mode-map
+   "<C-tab>" #'irc-next-channel
+   "<C-S-iso-lefttab>" #'irc-prev-channel))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(provide 'irc)
+;;; irc.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/ivy-clipmenu.el b/users/wpcarro/emacs/.emacs.d/wpc/ivy-clipmenu.el
new file mode 100644
index 000000000000..9f5b7ca8a0f1
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/ivy-clipmenu.el
@@ -0,0 +1,138 @@
+;;; ivy-clipmenu.el --- Emacs client for clipmenu -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Ivy integration with the clipboard manager, clipmenu.  Essentially, clipmenu
+;; turns your system clipboard into a list.
+;;
+;; To use this module, you must first install clipmenu and ensure that the
+;; clipmenud daemon is running.  Refer to the installation instructions at
+;; github.com/cdown/clipmenu for those details.
+;;
+;; This module intentionally does not define any keybindings since I'd prefer
+;; not to presume my users' preferences.  Personally, I use EXWM as my window
+;; manager, so I call `exwm-input-set-key' and map it to `ivy-clipmenu-copy'.
+;;
+;; Usually clipmenu integrates with rofi or dmenu.  This Emacs module integrates
+;; with ivy.  Launch this when you want to select a clip.
+;;
+;; Clipmenu itself supports a variety of environment variables that allow you to
+;; customize its behavior.  These variables are respected herein.  If you'd
+;; prefer to customize clipmenu's behavior from within Emacs, refer to the
+;; variables defined in this module.
+;;
+;; For more information:
+;; - See `clipmenu --help`.
+;; - Visit github.com/cdown/clipmenu.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 's)
+(require 'dash)
+(require 'ivy)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup ivy-clipmenu nil
+  "Ivy integration for clipmenu."
+  :group 'ivy)
+
+(defcustom ivy-clipmenu-directory
+  (or (getenv "XDG_RUNTIME_DIR")
+      (getenv "TMPDIR")
+      "/tmp")
+  "Base directory for clipmenu's data."
+  :type 'string
+  :group 'ivy-clipmenu)
+
+(defconst ivy-clipmenu-executable-version 5
+   "The major version number for the clipmenu executable.")
+
+(defconst ivy-clipmenu-cache-directory
+  (f-join ivy-clipmenu-directory
+          (format "clipmenu.%s.%s"
+                  ivy-clipmenu-executable-version
+                  (getenv "USER")))
+  "Directory where the clips are stored.")
+
+(defconst ivy-clipmenu-cache-file-pattern
+  (f-join ivy-clipmenu-cache-directory "line_cache_*")
+  "Glob pattern matching the locations on disk for clipmenu's labels.")
+
+(defcustom ivy-clipmenu-history-length
+  (or (getenv "CM_HISTLENGTH") 25)
+  "Limit the number of clips in the history.
+This value defaults to 25.")
+
+(defvar ivy-clipmenu-history nil
+  "History for `ivy-clipmenu-copy'.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun ivy-clipmenu-parse-content (x)
+  "Parse the label from the entry, X, in clipmenu's line-cache."
+  (->> (s-split " " x)
+       (-drop 1)
+       (s-join " ")))
+
+(defun ivy-clipmenu-list-clips ()
+  "Return a list of the content of all of the clips."
+  (->> ivy-clipmenu-cache-file-pattern
+       f-glob
+       (-map (lambda (path)
+               (s-split "\n" (f-read path) t)))
+       -flatten
+       (-reject #'s-blank?)
+       (-sort #'string>)
+       (-map #'ivy-clipmenu-parse-content)
+       delete-dups
+       (-take ivy-clipmenu-history-length)))
+
+(defun ivy-clipmenu-checksum (content)
+  "Return the CRC checksum of CONTENT."
+  (s-trim-right
+   (with-temp-buffer
+     (call-process "/bin/bash" nil (current-buffer) nil "-c"
+                   (format "cksum <<<'%s'" content))
+     (buffer-string))))
+
+(defun ivy-clipmenu-line-to-content (line)
+  "Map the chosen LINE from the line cache its content from disk."
+  (->> line
+       ivy-clipmenu-checksum
+       (f-join ivy-clipmenu-cache-directory)
+       f-read))
+
+(defun ivy-clipmenu-do-copy (x)
+  "Copy string, X, to the system clipboard."
+  (kill-new x)
+  (message "[ivy-clipmenu.el] Copied!"))
+
+(defun ivy-clipmenu-copy ()
+  "Use `ivy-read' to select and copy a clip.
+It's recommended to bind this function to a globally available keymap."
+  (interactive)
+  (let ((ivy-sort-functions-alist nil))
+    (ivy-read "Clipmenu: "
+              (ivy-clipmenu-list-clips)
+              :history 'ivy-clipmenu-history
+              :action (lambda (line)
+                        (->> line
+                             ivy-clipmenu-line-to-content
+                             ivy-clipmenu-do-copy)))))
+
+(provide 'ivy-clipmenu)
+;;; ivy-clipmenu.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/ivy-helpers.el b/users/wpcarro/emacs/.emacs.d/wpc/ivy-helpers.el
new file mode 100644
index 000000000000..d13b99353451
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/ivy-helpers.el
@@ -0,0 +1,68 @@
+;;; ivy-helpers.el --- More interfaces to ivy -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Hopefully to improve my workflows.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'tuple)
+(require 'string)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defun ivy-helpers-kv (prompt kv f)
+  "PROMPT users with the keys in KV and return its corresponding value.
+
+Apply key and value from KV to F."
+  (ivy-read
+   prompt
+   kv
+   :require-match t
+   :action (lambda (entry)
+             (funcall f (car entry) (cdr entry)))))
+
+(defun ivy-helpers-do-run-external-command (cmd)
+  "Execute the specified CMD and notify the user when it finishes."
+  (message "Starting %s..." cmd)
+  (set-process-sentinel
+   (start-process-shell-command cmd nil cmd)
+   (lambda (process event)
+     (when (string= event "finished\n")
+       (message "%s process finished." process)))))
+
+(defun ivy-helpers-list-external-commands ()
+  "Create a list of all external commands available on $PATH."
+  (cl-loop
+   for dir in (split-string (getenv "PATH") path-separator)
+   when (and (file-exists-p dir) (file-accessible-directory-p dir))
+   for lsdir = (cl-loop for i in (directory-files dir t)
+                        for bn = (file-name-nondirectory i)
+                        when (and (not (s-contains? "-wrapped" i))
+                                  (not (member bn completions))
+                                  (not (file-directory-p i))
+                                  (file-executable-p i))
+                        collect bn)
+   append lsdir into completions
+   finally return (sort completions 'string-lessp)))
+
+(defun ivy-helpers-run-external-command ()
+  "Prompts the user with a list of all installed applications to launch."
+  (interactive)
+  (let ((external-commands-list (ivy-helpers-list-external-commands)))
+    (ivy-read "Command:" external-commands-list
+              :require-match t
+              :action #'ivy-helpers-do-run-external-command)))
+
+;;; Code:
+(provide 'ivy-helpers)
+;;; ivy-helpers.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/kbd.el b/users/wpcarro/emacs/.emacs.d/wpc/kbd.el
new file mode 100644
index 000000000000..b456f30cba89
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/kbd.el
@@ -0,0 +1,86 @@
+;;; kbd.el --- Elisp keybinding -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; In order to stay organized, I'm attempting to dedicate KBD prefixes to
+;; specific functions.  I'm hoping I can be more deliberate with my keybinding
+;; choices this way.
+;;
+;; Terminology:
+;; For a more thorough overview of the terminology refer to `keybindings.md'
+;; file.  Here's a brief overview:
+;; - workspace: Anything concerning EXWM workspaces.
+;; - x11: Anything concerning X11 applications.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'al)
+(require 'set)
+(require 'string)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst kbd-prefixes
+  '((workspace . "s")
+    (x11 . "C-s"))
+  "Mapping of functions to designated keybinding prefixes to stay organized.")
+
+;; Assert that no keybindings are colliding.
+(prelude-assert
+ (= (al-count kbd-prefixes)
+    (->> kbd-prefixes
+         al-values
+         set-from-list
+         set-count)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun kbd-raw (f x)
+  "Return the string keybinding for function F and appendage X.
+Values for F include:
+- workspace
+- x11"
+  (prelude-assert (al-has-key? f kbd-prefixes))
+  (string-format
+   "%s-%s"
+   (al-get f kbd-prefixes)
+   x))
+
+(defun kbd-for (f x)
+  "Return the `kbd' for function F and appendage X.
+Values for F include:
+- workspace
+- x11"
+  (kbd (kbd-raw f x)))
+
+;; TODO: Prefer copying human-readable versions to the clipboard.  Right now
+;; this isn't too useful.
+(defun kbd-copy-keycode ()
+  "Copy the pressed key to the system clipboard."
+  (interactive)
+  (message "[kbd] Awaiting keypress...")
+  (let ((key (read-key)))
+    (clipboard-copy (string-format "%s" key))
+    (message (string-format "[kbd] \"%s\" copied!" key))))
+
+(defun kbd-print-keycode ()
+  "Prints the pressed keybinding."
+  (interactive)
+  (message "[kbd] Awaiting keypress...")
+  (message (string-format "[kbd] keycode: %s" (read-key))))
+
+(provide 'kbd)
+;;; kbd.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/keybindings.el b/users/wpcarro/emacs/.emacs.d/wpc/keybindings.el
new file mode 100644
index 000000000000..bbc7aaa47724
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/keybindings.el
@@ -0,0 +1,367 @@
+;;; keybindings.el --- Centralizing my keybindings -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Attempting to centralize my keybindings to simplify my configuration.
+;;
+;; I have some expectations about my keybindings.  Here are some of those
+;; defined:
+;; - In insert mode:
+;;   - C-a: beginning-of-line
+;;   - C-e: end-of-line
+;;   - C-b: backwards-char
+;;   - C-f: forwards-char
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'functions)
+(require 'clipboard)
+(require 'screen-brightness)
+(require 'pulse-audio)
+(require 'scrot)
+(require 'ivy-clipmenu)
+(require 'general)
+(require 'exwm)
+(require 'vterm-mgt)
+(require 'buffer)
+(require 'display)
+(require 'device)
+(require 'fonts)
+(require 'bookmark)
+(require 'constants)
+(require 'window-manager)
+
+;; Note: The following lines must be sorted this way.
+(setq evil-want-integration t)
+(setq evil-want-keybinding nil)
+(general-evil-setup)
+(require 'evil)
+(require 'evil-collection)
+(require 'evil-magit)
+(require 'evil-commentary)
+(require 'evil-surround)
+(require 'key-chord)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; General Keybindings
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Install KBDs like <SPC>jb to search through my monorepo.
+(bookmark-install-kbds)
+
+;; Ensure that evil's command mode behaves with readline bindings.
+(general-define-key
+ :keymaps 'evil-ex-completion-map
+ "C-a" #'move-beginning-of-line
+ "C-e" #'move-end-of-line
+ "C-k" #'kill-line
+ "C-u" #'evil-delete-whole-line
+ "C-v" #'evil-paste-after
+ "C-d" #'delete-char
+ "C-f" #'forward-char
+ "M-b" #'backward-word
+ "M-f" #'forward-word
+ "M-d" #'kill-word
+ "M-DEL" #'backward-kill-word
+ "C-b" #'backward-char)
+
+(general-mmap
+  :keymaps 'override
+  "RET" #'evil-goto-line
+  "H"   #'evil-first-non-blank
+  "L"   #'evil-end-of-line
+  "_"   #'ranger
+  "-"   #'dired-jump
+  "sl"  #'functions-evil-window-vsplit-right
+  "sh"  #'evil-window-vsplit
+  "sk"  #'evil-window-split
+  "sj"  #'functions-evil-window-split-down)
+
+(general-nmap
+  :keymaps 'override
+  "gu" #'browse-url-at-point
+  "gd" #'xref-find-definitions
+  ;; Wrapping `xref-find-references' in the `let' binding to prevent xref from
+  ;; prompting.  There are other ways to handle this variable, such as setting
+  ;; it globally with `setq' or buffer-locally with `setq-local'.  For now, I
+  ;; prefer setting it with `let', which should bind it in the dynamic scope
+  ;; for the duration of the `xref-find-references' function call.
+  "gx" (lambda ()
+         (interactive)
+         (let ((xref-prompt-for-identifier nil))
+           (call-interactively #'xref-find-references))))
+
+(general-unbind 'motion "M-." "C-p" "<SPC>")
+(general-unbind 'normal "s"   "M-." "C-p" "C-n")
+(general-unbind 'insert "C-v" "C-d" "C-a" "C-e" "C-n" "C-p" "C-k")
+
+(setq evil-symbol-word-search t)
+(evil-mode 1)
+(evil-collection-init)
+(evil-commentary-mode)
+(global-evil-surround-mode 1)
+
+;; Ensure the Evil search results get centered vertically.
+;; When Emacs is run from a terminal, this forces Emacs to redraw itself, which
+;; is visually disruptive.
+(when window-system
+  (progn
+    (defadvice isearch-update
+        (before advice-for-isearch-update activate)
+      (evil-scroll-line-to-center (line-number-at-pos)))
+    (defadvice evil-search-next
+        (after advice-for-evil-search-next activate)
+      (evil-scroll-line-to-center (line-number-at-pos)))
+    (defadvice evil-search-previous
+        (after advice-for-evil-search-previous activate)
+      (evil-scroll-line-to-center (line-number-at-pos)))))
+
+(key-chord-mode 1)
+(key-chord-define evil-insert-state-map "jk" 'evil-normal-state)
+
+;; This may be contraversial, but I never use the prefix key, and I'd prefer to
+;; have to bound to the readline function that deletes the entire line.
+(general-unbind "C-u")
+
+(defmacro keybindings-exwm (c fn)
+  "Bind C to FN using `exwm-input-set-key' with `kbd' applied to C."
+  `(exwm-input-set-key (kbd ,c) ,fn))
+
+(keybindings-exwm "C-M-v" #'ivy-clipmenu-copy)
+(keybindings-exwm "<XF86MonBrightnessUp>" #'screen-brightness-increase)
+(keybindings-exwm "<XF86MonBrightnessDown>" #'screen-brightness-decrease)
+(keybindings-exwm "<XF86AudioMute>" #'pulse-audio-toggle-mute)
+(keybindings-exwm "<XF86AudioLowerVolume>" #'pulse-audio-decrease-volume)
+(keybindings-exwm "<XF86AudioRaiseVolume>" #'pulse-audio-increase-volume)
+(keybindings-exwm "<XF86AudioMicMute>" #'pulse-audio-toggle-microphone)
+(keybindings-exwm (kbd-raw 'x11 "s") #'scrot-select)
+(keybindings-exwm "<C-M-tab>" #'window-manager-switch-to-exwm-buffer)
+(keybindings-exwm (kbd-raw 'workspace "k") #'fonts-increase-size)
+(keybindings-exwm (kbd-raw 'workspace "j") #'fonts-decrease-size)
+(keybindings-exwm (kbd-raw 'workspace "0") #'fonts-reset-size)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Window sizing
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(keybindings-exwm "C-M-=" #'balance-windows)
+(keybindings-exwm "C-M-j" #'shrink-window)
+(keybindings-exwm "C-M-k" #'enlarge-window)
+(keybindings-exwm "C-M-h" #'shrink-window-horizontally)
+(keybindings-exwm "C-M-l" #'enlarge-window-horizontally)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Window Management
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(keybindings-exwm "M-h" #'windmove-left)
+(keybindings-exwm "M-j" #'windmove-down)
+(keybindings-exwm "M-k" #'windmove-up)
+(keybindings-exwm "M-l" #'windmove-right)
+(keybindings-exwm "M-\\" #'evil-window-vsplit)
+(keybindings-exwm "M--" #'evil-window-split)
+(keybindings-exwm "M-q" #'delete-window)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Miscellaneous
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(keybindings-exwm "M-:" #'eval-expression)
+(keybindings-exwm "M-SPC" #'ivy-helpers-run-external-command)
+(keybindings-exwm "M-x" #'counsel-M-x)
+(keybindings-exwm "<M-tab>" #'window-manager-next-workspace)
+(keybindings-exwm "<M-S-iso-lefttab>" #'window-manager-prev-workspace)
+(keybindings-exwm "C-M-\\" #'ivy-pass)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Workspaces
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+(keybindings-exwm (kbd-raw 'workspace "l") #'window-manager-logout)
+
+(general-define-key
+ :keymaps 'override
+ "M-q" #'delete-window
+ "<s-return>" #'toggle-frame-fullscreen
+ "M-h" #'windmove-left
+ "M-l" #'windmove-right
+ "M-k" #'windmove-up
+ "M-j" #'windmove-down
+ "M-q" #'delete-window)
+
+;; Support pasting in M-:.
+(general-define-key
+ :keymaps 'read-expression-map
+ "C-v"   #'clipboard-yank
+ "C-S-v" #'clipboard-yank)
+
+(general-define-key
+ :prefix "<SPC>"
+ :states '(normal)
+ "." #'ffap
+ "gn" #'notmuch
+ "i" #'counsel-semantic-or-imenu
+ "I" #'ibuffer
+ "hk" #'helpful-callable
+ "hf" #'helpful-function
+ "hm" #'helpful-macro
+ "hc" #'helpful-command
+ "hk" #'helpful-key
+ "hv" #'helpful-variable
+ "hp" #'helpful-at-point
+ "hi" #'info-apropos
+ "s" #'flyspell-mode
+ "S" #'sort-lines
+ "=" #'align
+ "p" #'flycheck-previous-error
+ "f" #'project-find-file
+ "n" #'flycheck-next-error
+ "N" #'smerge-next
+ "W" #'balance-windows
+ "gss" #'magit-status
+ "gsb" (lambda ()
+         (interactive)
+         (magit-status constants-briefcase))
+ "E" #'refine
+ "es" #'functions-create-snippet
+ "l" #'linum-mode
+ "B" #'magit-blame
+ "w" #'save-buffer
+ "r" #'functions-evil-replace-under-point
+ "R" #'deadgrep)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Vterm
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Show or hide a vterm buffer.  I'm intentionally not defining this in
+;; vterm-mgt.el because it consumes `buffer-show-previous', and I'd like to
+;; avoid bloating vterm-mgt.el with dependencies that others may not want.
+(general-define-key (kbd-raw 'x11 "t")
+                    (lambda ()
+                      (interactive)
+                      (if (vterm-mgt--instance? (current-buffer))
+                          (switch-to-buffer (first (buffer-source-code-buffers)))
+                        (call-interactively #'vterm-mgt-find-or-create))))
+
+(general-define-key
+ :keymaps '(vterm-mode-map)
+ "C-S-n" #'vterm-mgt-instantiate
+ "C-S-w" #'vterm-mgt-kill
+ "<C-tab>" #'vterm-mgt-next
+ "<C-S-iso-lefttab>" #'vterm-mgt-prev
+ "<s-backspace>" #'vterm-mgt-rename-buffer)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Displays
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when (device-work-laptop?)
+  (general-define-key
+   :prefix "<SPC>"
+   :states '(normal)
+   "d0" #'display-enable-laptop
+   "D0" #'display-disable-laptop
+   "d1" #'display-enable-4k-horizontal
+   "D1" #'display-disable-4k-horizontal))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; notmuch
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; evil-collection adds many KBDs to notmuch modes. Some of these I find
+;; disruptive.
+(general-define-key
+ :states '(normal)
+ :keymaps '(notmuch-show-mode-map)
+ "M-j" nil
+ "M-k" nil
+ "<C-S-iso-lefttab>" #'notmuch-show-previous-thread-show
+ "<C-tab>" #'notmuch-show-next-thread-show
+ "e" #'notmuch-show-archive-message-then-next-or-next-thread)
+
+;; TODO(wpcarro): Consider moving this to a separate module
+(defun keybindings--evil-ex-define-cmd-local (cmd f)
+  "Define CMD to F locally to a buffer."
+  (unless (local-variable-p 'evil-ex-commands)
+    (setq-local evil-ex-commands (copy-alist evil-ex-commands)))
+  (evil-ex-define-cmd cmd f))
+
+;; TODO(wpcarro): Support a macro that can easily define evil-ex commands for a
+;; particular mode.
+;; Consumption:
+;; (evil-ex-for-mode 'notmuch-message-mode
+;;                   "x" #'notmuch-mua-send-and-exit)
+
+(add-hook 'notmuch-message-mode-hook
+          (lambda ()
+            (keybindings--evil-ex-define-cmd-local "x" #'notmuch-mua-send-and-exit)))
+
+;; For now, I'm mimmicking Gmail KBDs that I have memorized and enjoy
+(general-define-key
+ :states '(normal visual)
+ :keymaps '(notmuch-search-mode-map)
+ "M"  (lambda ()
+        (interactive)
+        (notmuch-search-tag '("-inbox" "+muted")))
+ "mi" (lambda ()
+        (interactive)
+        (notmuch-search-tag '("+inbox" "-action" "-review" "-waiting" "-muted")))
+ "ma" (lambda ()
+        (interactive)
+        (notmuch-search-tag '("-inbox" "+action" "-review" "-waiting")))
+ "mr" (lambda ()
+        (interactive)
+        (notmuch-search-tag '("-inbox" "-action" "+review" "-waiting")))
+ "mw" (lambda ()
+        (interactive)
+        (notmuch-search-tag '("-inbox" "-action" "-review" "+waiting")))
+ "e" #'notmuch-search-archive-thread)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; magit
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(general-define-key
+ :states '(normal)
+ :keymaps '(magit-status-mode-map
+            magit-log-mode-map
+            magit-revision-mode-map)
+ "l" #'evil-forward-char
+ "L" #'magit-log)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Info-mode
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; NOTE: I find some of the following, existing KBDs useful:
+;;   M-x info-apropos
+;;   u   Info-up
+;;   M-n clone-buffer
+(general-define-key
+ :states '(normal)
+ :keymaps '(Info-mode-map)
+ "SPC" nil
+ "g SPC" #'Info-scroll-up
+ "RET" #'Info-follow-nearest-node
+ "<C-tab>" #'Info-next
+ "<C-S-iso-lefttab>" #'Info-prev
+ "g l" #'Info-history-back
+ "g t" #'Info-toc)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; ibuffer
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(general-define-key
+ :states '(normal)
+ :keymaps '(ibuffer-mode-map)
+ "M-j" nil
+ "K" #'ibuffer-do-delete)
+
+(provide 'keybindings)
+;;; keybindings.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/keyboard.el b/users/wpcarro/emacs/.emacs.d/wpc/keyboard.el
new file mode 100644
index 000000000000..d5a3f92f122b
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/keyboard.el
@@ -0,0 +1,140 @@
+;;; keyboard.el --- Managing keyboard preferences with Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Setting key repeat and other values.
+;;
+;; Be wary of suspiciously round numbers.  Especially those divisible by ten!
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'string)
+(require 'number)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support clamping functions for repeat-{rate,delay} to ensure only valid
+;; values are sent to xset.
+(defcustom keyboard-repeat-rate 80
+  "The number of key repeat signals sent per second.")
+
+(defcustom keyboard-repeat-delay 170
+  "The number of milliseconds before autorepeat starts.")
+
+(defconst keyboard-repeat-rate-copy keyboard-repeat-rate
+  "Copy of `keyboard-repeat-rate' to support `keyboard-reset-key-repeat'.")
+
+(defconst keyboard-repeat-delay-copy keyboard-repeat-delay
+  "Copy of `keyboard-repeat-delay' to support `keyboard-reset-key-repeat'.")
+
+(defcustom keyboard-install-preferences? t
+  "When t, install keyboard preferences.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun keyboard-message (x)
+  "Message X in a structured way."
+  (message (string-format "[keyboard.el] %s" x)))
+
+(cl-defun keyboard-set-key-repeat (&key
+                                   (rate keyboard-repeat-rate)
+                                   (delay keyboard-repeat-delay))
+  "Use xset to set the key-repeat RATE and DELAY."
+  (prelude-start-process
+   :name "keyboard-set-key-repeat"
+   :command (string-format "xset r rate %s %s" delay rate)))
+
+;; NOTE: Settings like this are machine-dependent. For instance I only need to
+;; do this on my laptop and other devices where I don't have access to my split
+;; keyboard.
+;; NOTE: Running keysym Caps_Lock is not idempotent.  If this is called more
+;; than once, xmodmap will start to error about non-existent Caps_Lock symbol.
+;; For more information see here:
+;; https://unix.stackexchange.com/questions/108207/how-to-map-caps-lock-as-the-compose-key-using-xmodmap-portably-and-idempotently
+(defun keyboard-swap-caps-lock-and-escape ()
+  "Swaps the caps lock and escape keys using xmodmap."
+  (interactive)
+  ;; TODO: Ensure these work once the tokenizing in prelude-start-process works
+  ;; as expected.
+  (start-process "keyboard-swap-caps-lock-and-escape"
+                 nil "/usr/bin/xmodmap" "-e" "remove Lock = Caps_Lock")
+  (start-process "keyboard-swap-caps-lock-and-escape"
+                 nil "/usr/bin/xmodmap" "-e" "keysym Caps_Lock = Escape"))
+
+(defun keyboard-inc-repeat-rate ()
+  "Increment `keyboard-repeat-rate'."
+  (interactive)
+  (setq keyboard-repeat-rate (number-inc keyboard-repeat-rate))
+  (keyboard-set-key-repeat :rate keyboard-repeat-rate)
+  (keyboard-message
+   (string-format "Rate: %s" keyboard-repeat-rate)))
+
+(defun keyboard-dec-repeat-rate ()
+  "Decrement `keyboard-repeat-rate'."
+  (interactive)
+  (setq keyboard-repeat-rate (number-dec keyboard-repeat-rate))
+  (keyboard-set-key-repeat :rate keyboard-repeat-rate)
+  (keyboard-message
+   (string-format "Rate: %s" keyboard-repeat-rate)))
+
+(defun keyboard-inc-repeat-delay ()
+  "Increment `keyboard-repeat-delay'."
+  (interactive)
+  (setq keyboard-repeat-delay (number-inc keyboard-repeat-delay))
+  (keyboard-set-key-repeat :delay keyboard-repeat-delay)
+  (keyboard-message
+   (string-format "Delay: %s" keyboard-repeat-delay)))
+
+(defun keyboard-dec-repeat-delay ()
+  "Decrement `keyboard-repeat-delay'."
+  (interactive)
+  (setq keyboard-repeat-delay (number-dec keyboard-repeat-delay))
+  (keyboard-set-key-repeat :delay keyboard-repeat-delay)
+  (keyboard-message
+   (string-format "Delay: %s" keyboard-repeat-delay)))
+
+(defun keyboard-print-key-repeat ()
+  "Print the currently set values for key repeat."
+  (interactive)
+  (keyboard-message
+   (string-format "Rate: %s. Delay: %s"
+                  keyboard-repeat-rate
+                  keyboard-repeat-delay)))
+
+(defun keyboard-set-preferences ()
+  "Reset the keyboard preferences to their default values.
+NOTE: This function exists because occasionally I unplug and re-plug in a
+  keyboard and all of the preferences that I set using xset disappear."
+  (interactive)
+  (keyboard-swap-caps-lock-and-escape)
+  (keyboard-set-key-repeat :rate keyboard-repeat-rate
+                           :delay keyboard-repeat-delay)
+  ;; TODO: Implement this message function as a macro that pulls the current
+  ;; file name.
+  (keyboard-message "Keyboard preferences set!"))
+
+(defun keyboard-reset-key-repeat ()
+  "Set key repeat rate and delay to original values."
+  (interactive)
+  (keyboard-set-key-repeat :rate keyboard-repeat-rate-copy
+                           :delay keyboard-repeat-delay-copy)
+  (keyboard-message "Key repeat preferences reset."))
+
+(when keyboard-install-preferences?
+  (keyboard-set-preferences))
+
+(provide 'keyboard)
+;;; keyboard.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/laptop-battery.el b/users/wpcarro/emacs/.emacs.d/wpc/laptop-battery.el
new file mode 100644
index 000000000000..91b2e3125001
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/laptop-battery.el
@@ -0,0 +1,64 @@
+;;; laptop-battery.el --- Display laptop battery information -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Some wrappers to obtain battery information.
+;;
+;; To troubleshoot battery consumpton look into the CLI `powertop`.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Roadmap
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support functions that work with reporting battery stats.
+;; TODO: low-battery-reporting-threshold
+;; TODO: charged-battery-reporting-threshold
+;; TODO: Format modeline battery information.
+;; TODO: Provide better time information in the modeline.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'battery)
+(require 'al)
+(require 'maybe)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun laptop-battery-available? ()
+  "Return t if battery information is available."
+  (maybe-some? battery-status-function))
+
+(defun laptop-battery-percentage ()
+  "Return the current percentage of the battery."
+  (->> battery-status-function
+       funcall
+       (al-get 112)))
+
+(defun laptop-battery-print-percentage ()
+  "Return the current percentage of the battery."
+  (interactive)
+  (->> (laptop-battery-percentage)
+       message))
+
+(defun laptop-battery-display ()
+  "Display laptop battery percentage in the modeline."
+  (interactive)
+  (display-battery-mode 1))
+
+(defun laptop-battery-hide ()
+  "Hide laptop battery percentage in the modeline."
+  (interactive)
+  (display-battery-mode -1))
+
+(provide 'laptop-battery)
+;;; laptop-battery.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/list.el b/users/wpcarro/emacs/.emacs.d/wpc/list.el
new file mode 100644
index 000000000000..cc91ac1eaf60
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/list.el
@@ -0,0 +1,222 @@
+;;; list.el --- Functions for working with lists -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Since I prefer having the `list-' namespace, I wrote this module to wrap many
+;; of the functions that are defined in the the global namespace in ELisp.  I
+;; sometimes forget the names of these functions, so it's nice for them to be
+;; organized like this.
+;;
+;; Motivation:
+;; Here are some examples of function names that I cannot tolerate:
+;; - `car': Return the first element (i.e. "head") of a linked list
+;; - `cdr': Return the tail of a linked list
+
+;; As are most APIs for standard libraries that I write, this is heavily
+;; influenced by Elixir's standard library.
+;;
+;; Elixir's List library:
+;; - ++/2
+;; - --/2
+;; - hd/1
+;; - tl/1
+;; - in/2
+;; - length/1
+;;
+;; Similar libraries:
+;; - dash.el: Functional library that mimmicks Clojure.  It is consumed herein.
+;; - list-utils.el: Utility library that covers things that dash.el may not
+;;   cover.
+;;   stream.el: Elisp implementation of streams, "implemented as delayed
+;;   evaluation of cons cells."
+
+;; TODO: Consider naming this file linked-list.el.
+
+;; TODO: Support module-like macro that auto-namespaces functions.
+
+;; TODO: Consider wrapping most data structures like linked-lists,
+;; associative-lists, etc in a `cl-defstruct', so that the dispatching by type
+;; can be nominal instead of duck-typing.  I'm not sure if this is a good idea
+;; or not.  If I do this, I should provide isomorphisms to map between idiomatic
+;; ways of working with Elisp data structures and my wrapped variants.
+
+;; TODO: Are function aliases/synonyms even a good idea?  Or do they just
+;; bloat the API unnecessarily?
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Move `prelude-assert' elsewhere so that I can require it without
+;; introducing the circular dependency of list.el -> prelude.el -> list.el.
+;;(require 'prelude)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst list-tests? t
+  "When t, run the test suite.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun list-new ()
+  "Return a new, empty list."
+  '())
+
+(defun list-concat (&rest lists)
+  "Joins `LISTS' into on list."
+  (apply #'-concat lists))
+
+(defun list-join (joint xs)
+  "Join a list of strings, XS, with JOINT."
+  (if (list-empty? xs)
+      ""
+    (list-reduce (list-first xs)
+                 (lambda (x acc)
+                   (string-concat acc joint x))
+                 (list-tail xs))))
+
+(defun list-length (xs)
+  "Return the number of elements in `XS'."
+  (length xs))
+
+(defun list-get (i xs)
+  "Return the value in `XS' at `I', or nil."
+  (nth i xs))
+
+(defun list-head (xs)
+  "Return the head of `XS'."
+  (car xs))
+
+;; TODO: Learn how to write proper function aliases.
+(defun list-first (xs)
+  "Alias for `list-head' for `XS'."
+  (list-head xs))
+
+(defun list-tail (xs)
+  "Return the tail of `XS'."
+  (cdr xs))
+
+(defun list-reverse (xs)
+  "Reverses `XS'."
+  (reverse xs))
+
+(defun list-cons (x xs)
+  "Add `X' to the head of `XS'."
+  (cons x xs))
+
+;; map, filter, reduce
+
+;; TODO: Create function adapters like swap.
+;; (defun adapter/swap (f)
+;;   "Return a new function that wraps `F' and swaps the arguments."
+;;   (lambda (a b)
+;;     (funcall f b a)))
+
+;; TODO: Make this function work.
+(defun list-reduce (acc f xs)
+  "Return over `XS' calling `F' on an element in `XS'and `ACC'."
+  (-reduce-from (lambda (acc x) (funcall f x acc)) acc xs))
+
+(defun list-map (f xs)
+  "Call `F' on each element of `XS'."
+  (-map f xs))
+
+(defun list-map-indexed (f xs)
+  "Call `F' on each element of `XS' along with its index."
+  (-map-indexed (lambda (i x) (funcall f x i)) xs))
+
+(defun list-filter (p xs)
+  "Return a subset of XS where predicate P returned t."
+  (list-reverse
+   (list-reduce
+    '()
+    (lambda (x acc)
+      (if (funcall p x)
+          (list-cons x acc)
+        acc))
+    xs)))
+
+(defun list-reject (p xs)
+  "Return a subset of XS where predicate of P return nil."
+  (list-filter (lambda (x) (not (funcall p x))) xs))
+
+(defun list-find (p xs)
+  "Return the first x in XS that passes P or nil."
+  (-find p xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun list-instance? (xs)
+  "Return t if `XS' is a list.
+Be leery of using this with things like alists.  Many data structures in Elisp
+  are implemented using linked lists."
+  (listp xs))
+
+(defun list-empty? (xs)
+  "Return t if XS are empty."
+  (= 0 (list-length xs)))
+
+(defun list-all? (p xs)
+  "Return t if all `XS' pass the predicate, `P'."
+  (-all? p xs))
+
+(defun list-any? (p xs)
+  "Return t if any `XS' pass the predicate, `P'."
+  (-any? p xs))
+
+(defun list-contains? (x xs)
+  "Return t if X is in XS using `equal'."
+  (-contains? xs x))
+
+(defun list-xs-distinct-by? (f xs)
+  "Return t if all elements in XS are distinct after applying F to each."
+  (= (length xs)
+     (->> xs (-map f) set-from-list set-count)))
+
+;; TODO: Support dedupe.
+;; TODO: Should we call this unique? Or distinct?
+
+;; TODO: Add tests.
+(defun list-dedupe-adjacent (xs)
+  "Return XS without adjacent duplicates."
+  (prelude-assert (not (list-empty? xs)))
+  (list-reduce (list (list-first xs))
+    (lambda (x acc)
+      (if (equal x (list-first acc))
+          acc
+        (list-cons x acc)))
+    xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; (when list-tests?
+;;   (prelude-assert
+;;    (= 0
+;;       (list-length '())))
+;;   (prelude-assert
+;;    (= 5
+;;       (list-length '(1 2 3 4 5))))
+;;   (prelude-assert
+;;    (= 16
+;;       (list-reduce 1 (lambda (x acc) (+ x acc)) '(1 2 3 4 5))))
+;;   (prelude-assert
+;;    (equal '(2 4 6 8 10)
+;;           (list-map (lambda (x) (* x 2)) '(1 2 3 4 5)))))
+
+(provide 'list)
+;;; list.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/macros.el b/users/wpcarro/emacs/.emacs.d/wpc/macros.el
new file mode 100644
index 000000000000..07b88d8f5860
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/macros.el
@@ -0,0 +1,64 @@
+;;; macros.el --- Helpful variables for making my ELisp life more enjoyable -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This file contains helpful variables that I use in my ELisp development.
+
+;; TODO: Consider a macro solution for mimmicking OCaml's auto resolution of
+;; dependencies using `load-path' and friends.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 'string)
+(require 'symbol)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defmacro macros-enable (mode)
+  "Helper for enabling `MODE'.
+Useful in `add-hook' calls.  Some modes, like `linum-mode' need to be called as
+`(linum-mode 1)', so `(add-hook mode #'linum-mode)' won't work."
+  `#'(lambda nil (,mode 1)))
+
+(defmacro macros-disable (mode)
+  "Helper for disabling `MODE'.
+Useful in `add-hook' calls."
+  `#'(lambda nil (,mode -1)))
+
+(defmacro macros-add-hook-before-save (mode f)
+  "Register a hook, `F', for a mode, `MODE' more conveniently.
+Usage: (macros-add-hook-before-save 'reason-mode-hook #'refmt-before-save)"
+  `(add-hook ,mode
+             (lambda ()
+               (add-hook 'before-save-hook ,f))))
+
+;; TODO: Privatize?
+(defun macros--namespace ()
+  "Return the namespace for a function based on the filename."
+  (->> (buffer-file-name)
+       f-filename
+       f-base))
+
+(defmacro macros-comment (&rest _)
+  "Empty comment s-expresion where `BODY' is ignored."
+  `nil)
+
+(defmacro macros-support-file-extension (ext mode)
+  "Register MODE to automatically load with files ending with EXT extension.
+Usage: (macros-support-file-extension \"pb\" protobuf-mode)"
+  (let ((extension (string-format "\\.%s\\'" ext)))
+    `(add-to-list 'auto-mode-alist '(,extension . ,mode))))
+
+(provide 'macros)
+;;; macros.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/math.el b/users/wpcarro/emacs/.emacs.d/wpc/math.el
new file mode 100644
index 000000000000..9f6218fa4930
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/math.el
@@ -0,0 +1,63 @@
+;;; math.el --- Math stuffs -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.3"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Containing some useful mathematical functions.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'maybe)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst math-pi pi
+  "The number pi.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support all three arguments.
+;; Int -> Int -> Int -> Boolean
+(cl-defun math-triangle-of-power (&key base power result)
+  (cond
+   ((maybe-somes? base power result)
+    (error "All three arguments should not be set"))
+   ((maybe-somes? power result)
+    (message "power and result"))
+   ((maybe-somes? base result)
+    (log result base))
+   ((maybe-somes? base power)
+    (expt base power))
+   (t
+    (error "Two of the three arguments must be set"))))
+
+(defun math-mod (x y)
+  "Return X mod Y."
+  (mod x y))
+
+(defun math-exp (x y)
+  "Return X raised to the Y."
+  (expt x y))
+
+(defun math-round (x)
+  "Round X to nearest ones digit."
+  (round x))
+
+(defun math-floor (x)
+  "Floor value X."
+  (floor x))
+
+(provide 'math)
+;;; math.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/maybe.el b/users/wpcarro/emacs/.emacs.d/wpc/maybe.el
new file mode 100644
index 000000000000..270ee909a8e8
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/maybe.el
@@ -0,0 +1,79 @@
+;;; maybe.el --- Library for dealing with nil values -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Inspired by Elm's Maybe library.
+;;
+;; For now, a Nothing value will be defined exclusively as a nil value.  I'm
+;; uninterested in supported falsiness in this module even at risk of going
+;; against the LISP grain.
+;;
+;; I'm avoiding introducing a struct to handle the creation of Just and Nothing
+;; variants of Maybe.  Perhaps this is a mistake in which case this file would
+;; be more aptly named nil.el.  I may change that.  Because of this limitation,
+;; functions in Elm's Maybe library like andThen, which is the monadic bind for
+;; the Maybe type, doesn't have a home here since we cannot compose multiple
+;; Nothing or Just values without a struct or some other construct.
+;;
+;; Possible names for the variants of a Maybe.
+;; None    | Some
+;; Nothing | Something
+;; None    | Just
+;; Nil     | Set
+;;
+;; NOTE: In Elisp, values like '() (i.e. the empty list) are aliases for nil.
+;; What else in Elisp is an alias in this way?
+;; Examples:
+;; TODO: Provide examples of other nil types in Elisp.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'list)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar maybe--run-tests? t
+  "When t, run the test suite defined herein.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun maybe-nil? (x)
+  "Return t if X is nil."
+  (eq nil x))
+
+(defun maybe-some? (x)
+  "Return t when X is non-nil."
+  (not (maybe-nil? x)))
+
+(defun maybe-nils? (&rest xs)
+  "Return t if all XS are nil."
+  (list-all? #'maybe-nil? xs))
+
+(defun maybe-somes? (&rest xs)
+  "Return t if all XS are non-nil."
+  (list-all? #'maybe-some? xs))
+
+(defun maybe-default (default x)
+  "Return DEFAULT when X is nil."
+  (if (maybe-nil? x) default x))
+
+(defun maybe-map (f x)
+  "Apply F to X if X is not nil."
+  (if (maybe-some? x)
+      (funcall f x)
+    x))
+
+(provide 'maybe)
+;;; maybe.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/modeline.el b/users/wpcarro/emacs/.emacs.d/wpc/modeline.el
new file mode 100644
index 000000000000..6852bb284bc5
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/modeline.el
@@ -0,0 +1,69 @@
+;;; modeline.el --- Customize my mode-line -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Because I use EXWM, I treat my Emacs mode-line like my system bar: I need to
+;; quickly check the system time, and I expect it to be at the bottom-right of
+;; my Emacs frame.  I used doom-modeline for awhile, which is an impressive
+;; package, but it conditionally colorizes on the modeline for the active
+;; buffer.  So if my bottom-right window is inactive, I cannot see the time.
+;;
+;; My friend, @tazjin, has a modeline setup that I think is more compatible with
+;; EXWM, so I'm going to base my setup off of his.
+
+;;; Code:
+
+(use-package telephone-line)
+
+(defun modeline-bottom-right-window? ()
+  "Determines whether the last (i.e.
+bottom-right) window of the
+active frame is showing the buffer in which this function is
+  executed."
+  (let* ((frame (selected-frame))
+         (right-windows (window-at-side-list frame 'right))
+         (bottom-windows (window-at-side-list frame 'bottom))
+         (last-window (car (seq-intersection right-windows bottom-windows))))
+    (eq (current-buffer) (window-buffer last-window))))
+
+(defun modeline-maybe-render-time ()
+  "Conditionally renders the `mode-line-misc-info' string.
+
+  The idea is to not display information like the current time,
+  load, battery levels on all buffers."
+  (when (modeline-bottom-right-window?)
+    (telephone-line-raw mode-line-misc-info t)))
+
+(defun modeline-setup ()
+  "Render my custom modeline."
+  (telephone-line-defsegment telephone-line-last-window-segment ()
+    (modeline-maybe-render-time))
+  ;; Display the current EXWM workspace index in the mode-line
+  (telephone-line-defsegment telephone-line-exwm-workspace-index ()
+    (when (modeline-bottom-right-window?)
+      (format "[%s]" exwm-workspace-current-index)))
+  ;; Define a highlight font for ~ important ~ information in the last
+  ;; window.
+  (defface special-highlight
+    '((t (:foreground "white" :background "#5f627f"))) "")
+  (add-to-list 'telephone-line-faces
+               '(highlight . (special-highlight . special-highlight)))
+  (setq telephone-line-lhs
+        '((nil . (telephone-line-position-segment))
+          (accent . (telephone-line-buffer-segment))))
+  (setq telephone-line-rhs
+        '((accent . (telephone-line-major-mode-segment))
+          (nil . (telephone-line-last-window-segment
+                  telephone-line-exwm-workspace-index))))
+  (setq telephone-line-primary-left-separator 'telephone-line-tan-left
+        telephone-line-primary-right-separator 'telephone-line-tan-right
+        telephone-line-secondary-left-separator 'telephone-line-tan-hollow-left
+        telephone-line-secondary-right-separator 'telephone-line-tan-hollow-right)
+  (telephone-line-mode 1))
+
+(provide 'modeline)
+;;; modeline.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/number.el b/users/wpcarro/emacs/.emacs.d/wpc/number.el
new file mode 100644
index 000000000000..c8ed665b3098
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/number.el
@@ -0,0 +1,142 @@
+;;; number.el --- Functions for working with numbers -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;;
+;; Classifications of numbers:
+;; - Natural: (a.k.a positive integers, counting numbers); {1, 2, 3, ... }
+;;
+;; - Whole: Natural Numbers, plus zero; {0, 1, 2, 3, ...}
+;;
+;; - Integers: Whole numbers plus all the negatives of the natural numbers;
+;;   {... , -2, -1, 0, 1, 2, ...}
+;;
+;; - Rational numbers: (a.k.a. fractions) where the top and bottom numbers are
+;;   integers; e.g., 1/2, 3/4, 7/2, ⁻4/3, 4/1.  Note: The denominator cannot be
+;;   0, but the numerator can be.
+;;
+;; - Real numbers: All numbers that can be written as a decimal.  This includes
+;;   fractions written in decimal form e.g., 0.5, 0.75 2.35, ⁻0.073, 0.3333, or
+;;   2.142857. It also includes all the irrational numbers such as π, √2 etc.
+;;   Every real number corresponds to a point on the number line.
+;;
+;; The functions defined herein attempt to capture the mathematical definitions
+;; of numbers and their classifications as defined above.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst number-test? t
+  "When t, run the test suite defined herein.")
+
+;; TODO: What about int.el?
+
+;; TODO: How do we handle a number typeclass?
+
+(defun number-positive? (x)
+  "Return t if `X' is a positive number."
+  (> x 0))
+
+(defun number-negative? (x)
+  "Return t if `X' is a positive number."
+  (< x 0))
+
+;; TODO: Don't rely on this. Need to have 10.0 and 10 behave similarly.
+(defun number-float? (x)
+  "Return t if `X' is a floating point number."
+  (floatp x))
+
+(defun number-natural? (x)
+  "Return t if `X' is a natural number."
+  (and (number-positive? x)
+       (not (number-float? x))))
+
+(defun number-whole? (x)
+  "Return t if `X' is a whole number."
+  (or (= 0 x)
+      (number-natural? x)))
+
+(defun number-integer? (x)
+  "Return t if `X' is an integer."
+  (or (number-whole? x)
+      (number-natural? (- x))))
+
+;; TODO: How defensive should these guards be?  Should we assert that the inputs
+;; are integers before checking evenness or oddness?
+
+;; TODO: Look up Runar (from Unison) definition of handling zero as even or odd.
+
+;; TODO: How should rational numbers be handled? Lisp is supposedly famous for
+;; its handling of rational numbers.
+;; TODO: `calc-mode' supports rational numbers as "1:2" meaning "1/2"
+;; (defun number-rational? (x))
+
+;; TODO: Can or should I support real numbers?
+;; (defun number-real? (x))
+
+(defun number-even? (x)
+  "Return t if `X' is an even number."
+  (or (= 0 x)
+      (= 0 (mod x 2))))
+
+(defun number-odd? (x)
+  "Return t if `X' is an odd number."
+  (not (number-even? x)))
+
+(defun number-dec (x)
+  "Subtract one from `X'.
+While this function is undeniably trivial, I have unintentionally done (- 1 x)
+  when in fact I meant to do (- x 1) that I figure it's better for this function
+  to exist, and for me to train myself to reach for it and its inc counterpart."
+  (- x 1))
+
+(defun number-inc (x)
+  "Add one to `X'."
+  (+ x 1))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when number-test?
+  (prelude-assert
+   (number-positive? 10))
+  (prelude-assert
+   (number-natural? 10))
+  (prelude-assert
+   (number-whole? 10))
+  (prelude-assert
+   (number-whole? 0))
+  (prelude-assert
+   (number-integer? 10))
+  ;; (prelude-assert
+  ;;  (= 120 (number-factorial 5)))
+  (prelude-assert
+   (number-even? 6))
+  (prelude-refute
+   (number-odd? 6))
+  (prelude-refute
+   (number-positive? -10))
+  (prelude-refute
+   (number-natural? 10.0))
+  (prelude-refute
+   (number-natural? -10))
+  (prelude-refute
+   (number-natural? -10.0)))
+
+(provide 'number)
+;;; number.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/prelude.el b/users/wpcarro/emacs/.emacs.d/wpc/prelude.el
new file mode 100644
index 000000000000..824a80f8047c
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/prelude.el
@@ -0,0 +1,145 @@
+;;; prelude.el --- My attempt at augmenting Elisp stdlib -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.3"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Some of these ideas are scattered across other modules like `fs',
+;; `string-functions', etc.  I'd like to keep everything modular.  I still don't
+;; have an answer for which items belond in `misc'; I don't want that to become
+;; a dumping grounds.  Ideally this file will `require' all other modules and
+;; define just a handful of functions.
+
+;; TODO: Consider removing all dependencies from prelude.el.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'dash)
+(require 's)
+(require 'f)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Utilities
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun prelude-to-string (x)
+  "Convert X to a string."
+  (format "%s" x))
+
+(defun prelude-inspect (&rest args)
+  "Message ARGS where ARGS are any type."
+  (->> args
+       (-map #'prelude-to-string)
+       (apply #'s-concat)
+       message))
+
+(defmacro prelude-call-process-to-string (cmd &rest args)
+  "Return the string output of CMD called with ARGS."
+  `(with-temp-buffer
+     (call-process ,cmd nil (current-buffer) nil ,@args)
+     (buffer-string)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Assertions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Should I `throw' instead of `error' here?
+(defmacro prelude-assert (x)
+  "Errors unless X is t.
+These are strict assertions and purposely do not rely on truthiness."
+  (let ((as-string (prelude-to-string x)))
+    `(unless (equal t ,x)
+       (error (s-concat "Assertion failed: " ,as-string)))))
+
+(defmacro prelude-refute (x)
+  "Errors unless X is nil."
+  (let ((as-string (prelude-to-string x)))
+    `(unless (equal nil ,x)
+       (error (s-concat "Refutation failed: " ,as-string)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Adapter functions
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun prelude-identity (x)
+  "Return X unchanged."
+  x)
+
+(defun prelude-const (x)
+  "Return a variadic lambda that will return X."
+  (lambda (&rest _) x))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Miscellaneous
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Consider packaging these into a linum-color.el package.
+;; TODO: Generate the color used here from the theme.
+(defvar prelude--linum-safe? nil
+  "Flag indicating whether it is safe to work with function `linum-mode'.")
+
+(defvar prelude--linum-mru-color nil
+  "Stores the color most recently attempted to be applied.")
+
+(add-hook 'linum-mode-hook
+          (lambda ()
+            (setq prelude--linum-safe? t)
+            (when (maybe-some? prelude--linum-mru-color)
+              (set-face-foreground 'linum prelude--linum-mru-color))))
+
+(defun prelude-set-line-number-color (color)
+  "Safely set linum color to `COLOR'.
+
+If this is called before Emacs initializes, the color will be stored in
+`prelude--linum-mru-color' and applied once initialization completes.
+
+Why is this safe?
+If `(set-face-foreground 'linum)' is called before initialization completes,
+Emacs will silently fail.  Without this function, it is easy to introduce
+difficult to troubleshoot bugs in your init files."
+  (if prelude--linum-safe?
+      (set-face-foreground 'linum color)
+    (setq prelude--linum-mru-color color)))
+
+(defun prelude-prompt (prompt)
+  "Read input from user with PROMPT."
+  (read-string prompt))
+
+(cl-defun prelude-start-process (&key name command)
+  "Pass command string, COMMAND, and the function name, NAME.
+This is a wrapper around `start-process' that has an API that resembles
+`shell-command'."
+  ;; TODO: Fix the bug with tokenizing here, since it will split any whitespace
+  ;; character, even though it shouldn't in the case of quoted string in shell.
+  ;; e.g. - "xmodmap -e 'one two three'" => '("xmodmap" "-e" "'one two three'")
+  (prelude-refute (s-contains? "'" command))
+  (let* ((tokens (s-split " " command))
+         (program-name (nth 0 tokens))
+         (program-args (cdr tokens)))
+    (apply #'start-process
+           `(,(format "*%s<%s>*" program-name name)
+             ,nil
+             ,program-name
+             ,@program-args))))
+
+(defun prelude-executable-exists? (name)
+  "Return t if CLI tool NAME exists according to the variable `exec-path'."
+  (let ((file (locate-file name exec-path)))
+    (require 'maybe)
+    (if (maybe-some? file)
+        (f-exists? file)
+      nil)))
+
+(defmacro prelude-time (x)
+  "Print the time it takes to evaluate X."
+  `(benchmark 1 ',x))
+
+(provide 'prelude)
+;;; prelude.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/pulse-audio.el b/users/wpcarro/emacs/.emacs.d/wpc/pulse-audio.el
new file mode 100644
index 000000000000..d22cace46de9
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/pulse-audio.el
@@ -0,0 +1,70 @@
+;;; pulse-audio.el --- Control audio with Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Because everything in my configuration is turning into Elisp these days.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'string)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst pulse-audio--step-size 5
+  "The size by which to increase or decrease the volume.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun pulse-audio--message (x)
+  "Output X to *Messages*."
+  (message (string-format "[pulse-audio.el] %s" x)))
+
+(defun pulse-audio-toggle-mute ()
+  "Mute the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-toggle-mute"
+   :command "pactl set-sink-mute @DEFAULT_SINK@ toggle")
+  (pulse-audio--message "Mute toggled."))
+
+(defun pulse-audio-toggle-microphone ()
+  "Mute the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-toggle-microphone"
+   :command "pactl set-source-mute @DEFAULT_SOURCE@ toggle")
+  (pulse-audio--message "Microphone toggled."))
+
+(defun pulse-audio-decrease-volume ()
+  "Low the volume output of the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-decrease-volume"
+   :command (string-format "pactl set-sink-volume @DEFAULT_SINK@ -%s%%"
+                           pulse-audio--step-size))
+  (pulse-audio--message "Volume decreased."))
+
+(defun pulse-audio-increase-volume ()
+  "Raise the volume output of the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-increase-volume"
+   :command (string-format "pactl set-sink-volume @DEFAULT_SINK@ +%s%%"
+                           pulse-audio--step-size))
+  (pulse-audio--message "Volume increased."))
+
+(provide 'pulse-audio)
+;;; pulse-audio.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/random.el b/users/wpcarro/emacs/.emacs.d/wpc/random.el
new file mode 100644
index 000000000000..aa3c3071bb8f
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/random.el
@@ -0,0 +1,81 @@
+;;; random.el --- Functions for working with randomness -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Functions for working with randomness.  Some of this code is not as
+;; functional as I'd like from.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'number)
+(require 'math)
+(require 'series)
+(require 'list)
+(require 'set)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun random-int (x)
+  "Return a random integer from 0 to `X'."
+  (random x))
+
+;; TODO: Make this work with sequences instead of lists.
+(defun random-choice (xs)
+  "Return a random element of `XS'."
+  (let ((ct (list-length xs)))
+    (list-get
+     (random-int ct)
+     xs)))
+
+(defun random-boolean? ()
+  "Randonly return t or nil."
+  (random-choice (list t nil)))
+
+;; TODO: This may not work if any of these generate numbers like 0, 1, etc.
+(defun random-uuid ()
+  "Return a generated UUID string."
+  (let ((eight  (number-dec (math-triangle-of-power :base 16 :power 8)))
+        (four   (number-dec (math-triangle-of-power :base 16 :power 4)))
+        (twelve (number-dec (math-triangle-of-power :base 16 :power 12))))
+    (format "%x-%x-%x-%x-%x"
+            (random-int eight)
+            (random-int four)
+            (random-int four)
+            (random-int four)
+            (random-int twelve))))
+
+(defun random-token (length)
+  "Return a randomly generated hexadecimal string of LENGTH."
+  (->> (series/range 0 (number-dec length))
+       (list-map (lambda (_) (format "%x" (random-int 15))))
+       (list-join "")))
+
+;; TODO: Support random-sample
+;; (defun random-sample (n xs)
+;;   "Return a randomly sample of list XS of size N."
+;;   (prelude-assert (and (>= n 0) (< n (list-length xs))))
+;;   (cl-labels ((do-sample
+;;                (n xs y ys)
+;;                (if (= n (set-count ys))
+;;                    (->> ys
+;;                         set-to-list
+;;                         (list-map (lambda (i)
+;;                                     (list-get i xs))))
+;;                  (if (set-contains? y ys)
+;;                      (do-sample n xs (random-int (list-length xs)) ys)
+;;                    (do-sample n xs y (set-add y ys))))))
+;;     (do-sample n xs (random-int (list-length xs)) (set-new))))
+
+(provide 'random)
+;;; random.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/region.el b/users/wpcarro/emacs/.emacs.d/wpc/region.el
new file mode 100644
index 000000000000..f915f24ec851
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/region.el
@@ -0,0 +1,24 @@
+;;; region.el --- Functions for working with regions -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Sometimes Emacs's function names and argument ordering is great; other times,
+;; it isn't.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun region-to-string ()
+  "Return the string in the active region."
+  (buffer-substring-no-properties (region-beginning)
+                                  (region-end)))
+
+(provide 'region)
+;;; region.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/scope.el b/users/wpcarro/emacs/.emacs.d/wpc/scope.el
new file mode 100644
index 000000000000..267baac9fb14
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/scope.el
@@ -0,0 +1,107 @@
+;;; scope.el --- Work with a scope data structure -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Exposing an API for working with a scope data structure in a non-mutative
+;; way.
+;;
+;; What's a scope?  Think of a scope as a stack of key-value bindings.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'al)
+(require 'stack)
+(require 'struct)
+(require '>)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Create
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct scope scopes)
+
+(defun scope-new ()
+  "Return an empty scope."
+  (make-scope :scopes (->> (stack-new)
+                           (stack-push (al-new)))))
+
+(defun scope-flatten (xs)
+  "Return a flattened representation of the scope, XS.
+The newest bindings eclipse the oldest."
+  (->> xs
+       scope-scopes
+       stack-to-list
+       (list-reduce (al-new)
+                    (lambda (scope acc)
+                      (al-merge acc scope)))))
+
+(defun scope-push-new (xs)
+  "Push a new, empty scope onto XS."
+  (struct-update scope
+                 scopes
+                 (>-> (stack-push (al-new)))
+                 xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Read
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope-get (k xs)
+  "Return K from XS if it's in scope."
+  (->> xs
+       scope-flatten
+       (al-get k)))
+
+(defun scope-current (xs)
+  "Return the newest scope from XS."
+  (let ((xs-copy (copy-scope xs)))
+    (->> xs-copy
+         scope-scopes
+         stack-peek)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Update
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope-set (k v xs)
+  "Set value, V, at key, K, in XS for the current scope."
+  (struct-update scope
+                 scopes
+                 (>-> (stack-map-top (>-> (al-set k v))))
+                 xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Delete
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope-pop (xs)
+  "Return a new scope without the top element from XS."
+  (->> xs
+       scope-scopes
+       stack-pop))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun scope-defined? (k xs)
+  "Return t if K is in scope of XS."
+  (->> xs
+       scope-flatten
+       (al-has-key? k)))
+
+;; TODO: Find a faster way to write aliases like this.
+(defun scope-instance? (xs)
+  "Return t if XS is a scope struct."
+  (scope-p xs))
+
+(provide 'scope)
+;;; scope.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/screen-brightness.el b/users/wpcarro/emacs/.emacs.d/wpc/screen-brightness.el
new file mode 100644
index 000000000000..30973607bb03
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/screen-brightness.el
@@ -0,0 +1,49 @@
+;;; screen-brightness.el --- Control laptop screen brightness -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Mainly just Elisp wrappers around `xbacklight`.
+
+;;; Code:
+
+;; TODO: Define some isomorphisms. E.g. int->string, string->int.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst screen-brightness-step-size 15
+  "The size of the increment or decrement step for the screen's brightness.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun screen-brightness-increase ()
+  "Increase the screen brightness."
+  (interactive)
+  (prelude-start-process
+   :name "screen-brightness-increase"
+   :command (string-format "xbacklight -inc %s" screen-brightness-step-size))
+  (message "[screen-brightness.el] Increased screen brightness."))
+
+(defun screen-brightness-decrease ()
+  "Decrease the screen brightness."
+  (interactive)
+  (prelude-start-process
+   :name "screen-brightness-decrease"
+   :command (string-format "xbacklight -dec %s" screen-brightness-step-size))
+  (message "[screen-brightness.el] Decreased screen brightness."))
+
+(provide 'screen-brightness)
+;;; screen-brightness.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/scrot.el b/users/wpcarro/emacs/.emacs.d/wpc/scrot.el
new file mode 100644
index 000000000000..e7231b44fd95
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/scrot.el
@@ -0,0 +1,58 @@
+;;; scrot.el --- Screenshot functions -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; scrot is a Linux utility for taking screenshots.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 'string)
+(require 'ts)
+(require 'clipboard)
+(require 'kbd)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst scrot-screenshot-directory "~/Downloads"
+  "The default directory for screenshot outputs.")
+
+(defconst scrot-path-to-executable "/usr/bin/scrot"
+  "Path to the scrot executable.")
+
+(defconst scrot-output-format "screenshot_%H:%M:%S_%Y-%m-%d.png"
+  "The format string for the output screenshot file.
+See scrot's man page for more information.")
+
+(defun scrot--copy-image (path)
+  "Use xclip to copy the image at PATH to the clipboard.
+This currently only works for PNG files because that's what I'm outputting"
+  (call-process "xclip" nil nil nil
+                "-selection" "clipboard" "-t" "image/png" path)
+  (message (string-format "[scrot.el] Image copied to clipboard!")))
+
+(defun scrot-select ()
+  "Click-and-drag to screenshot a region.
+The output path is copied to the user's clipboard."
+  (interactive)
+  (let ((screenshot-path (f-join scrot-screenshot-directory
+                                 (ts-format scrot-output-format (ts-now)))))
+    (make-process
+     :name "scrot-select"
+     :command `(,scrot-path-to-executable "--select" ,screenshot-path)
+     :sentinel (lambda (proc _err)
+                 (when (= 0 (process-exit-status proc))
+                   (scrot--copy-image screenshot-path))))))
+
+(provide 'scrot)
+;;; scrot.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/sequence.el b/users/wpcarro/emacs/.emacs.d/wpc/sequence.el
new file mode 100644
index 000000000000..9da3ba4575f9
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/sequence.el
@@ -0,0 +1,109 @@
+;;; sequence.el --- Working with the "sequence" types -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Elisp supports a typeclass none as "sequence" which covers the following
+;; types:
+;; - list: '(1 2 3 4 5)
+;; - vector: ["John" 27 :blue]
+;; - string: "To be or not to be..."
+
+;; TODO: Document the difference between a "reduce" and a "fold".  I.e. - reduce
+;; has an initial value whereas fold uses the first element in the sequence as
+;; the initial value.
+;;
+;; Note: This should be an approximation of Elixir's Enum protocol albeit
+;; without streams.
+;;
+;; Elisp has done a lot of this work already and these are mostly wrapper
+;; functions.
+;; See the following list for reference:
+;; - sequencep
+;; - elt
+;; - copy-sequence
+;; - reverse
+;; - nreverse
+;; - sort
+;; - seq-elt
+;; - seq-length
+;; - seqp
+;; - seq-drop
+;; - seq-take
+;; - seq-take-while
+;; - seq-drop-while
+;; - seq-do
+;; - seq-map
+;; - seq-mapn
+;; - seq-filter
+;; - seq-remove
+;; - seq-reduce
+;; - seq-some
+;; - seq-find
+;; - seq-every-p
+;; - seq-empty-p
+;; - seq-count
+;; - seq-sort
+;; - seq-contains
+;; - seq-position
+;; - seq-uniq
+;; - seq-subseq
+;; - seq-concatenate
+;; - seq-mapcat
+;; - seq-partition
+;; - seq-intersection
+;; - seq-difference
+;; - seq-group-by
+;; - seq-into
+;; - seq-min
+;; - seq-max
+;; - seq-doseq
+;; - seq-let
+
+;;; Code:
+
+;; Perhaps we can provide default implementations for `filter' and `map' derived
+;; from the `reduce' implementation.
+;; (defprotocol sequence
+;;   :functions (reduce))
+;; (definstance sequence list
+;;   :reduce #'list-reduce
+;;   :filter #'list-filter
+;;   :map    #'list-map)
+;; (definstance sequence vector
+;;   :reduce #'vector/reduce)
+;; (definstance sequence string
+;;   :reduce #'string)
+
+(defun sequence-classify (xs)
+  "Return the type of `XS'."
+  (cond
+   ((listp xs) 'list)
+   ((vectorp xs) 'vector)
+   ((stringp xs) 'string)))
+
+(defun sequence-reduce (acc f xs)
+  "Reduce of `XS' calling `F' on x and `ACC'."
+  (seq-reduce
+   (lambda (acc x)
+     (funcall f x acc))
+   xs
+   acc))
+
+;; Elixir also turned everything into a list for efficiecy reasons.
+
+(defun sequence-filter (p xs)
+  "Filter `XS' with predicate, `P'.
+Returns a list regardless of the type of `XS'."
+  (seq-filter p xs))
+
+(defun sequence-map (f xs)
+  "Maps `XS' calling `F' on each element.
+Returns a list regardless of the type of `XS'."
+  (seq-map f xs))
+
+(provide 'sequence)
+;;; sequence.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/series.el b/users/wpcarro/emacs/.emacs.d/wpc/series.el
new file mode 100644
index 000000000000..00be03a976f0
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/series.el
@@ -0,0 +1,93 @@
+;;; series.el --- Hosting common series of numbers -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Encoding number series as I learn about them.
+;;
+;; These are the following series I'm interested in supporting:
+;; - Fibonacci
+;; - Catalan numbers
+;; - Figurate number series
+;;   - Triangular
+;;   - Square
+;;   - Pentagonal
+;;   - Hexagonal
+;;   - Lazy-caterer
+;; - Magic square
+;; - Look-and-say
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'number)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun series-range (beg end)
+  "Create a list of numbers from `BEG' to `END'.
+This is an inclusive number range."
+  (if (< end beg)
+      (list-reverse
+       (number-sequence end beg))
+    (number-sequence beg end)))
+
+(defun series-fibonacci-number (i)
+  "Return the number in the fibonacci series at `I'."
+  (cond
+   ((= 0 i) 0)
+   ((= 1 i) 1)
+   (t (+ (series-fibonacci-number (- i 1))
+         (series-fibonacci-number (- i 2))))))
+
+(defun series-fibonacci (n)
+  "Return the first `N' numbers of the fibonaccci series starting at zero."
+  (if (= 0 n)
+      '()
+    (list-reverse
+     (list-cons (series-fibonacci-number (number-dec n))
+                (list-reverse
+                 (series-fibonacci (number-dec n)))))))
+
+;; TODO: Consider memoization.
+(defun series-triangular-number (i)
+  "Return the number in the triangular series at `I'."
+  (if (= 0 i)
+      0
+    (+ i (series-triangular-number (number-dec i)))))
+
+;; TODO: Improve performance.
+;; TODO: Consider creating a stream protocol with `stream/next' and implement
+;; this using that.
+(defun series-triangular (n)
+  "Return the first `N' numbers of a triangular series starting at 0."
+  (if (= 0 n)
+      '()
+    (list-reverse
+     (list-cons (series-triangular-number (number-dec n))
+                (list-reverse
+                 (series-triangular (number-dec n)))))))
+
+(defun series-catalan-number (i)
+  "Return the catalan number in the series at `I'."
+  (if (= 0 i)
+      1
+    (/ (number-factorial (* 2 i))
+       (* (number-factorial (number-inc i))
+          (number-factorial i)))))
+
+(defun series-catalan (n)
+  "Return the first `N' numbers in a catalan series."
+  (->> (series-range 0 (number-dec n))
+       (list-map #'series-catalan-number)))
+
+(provide 'series)
+;;; series.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/set.el b/users/wpcarro/emacs/.emacs.d/wpc/set.el
new file mode 100644
index 000000000000..51c0c434f54e
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/set.el
@@ -0,0 +1,175 @@
+;;; set.el --- Working with mathematical sets -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; The set data structure is a collection that deduplicates its elements.
+
+;;; Code:
+
+(require 'ht) ;; friendlier API for hash-tables
+(require 'dotted)
+(require 'struct)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Wish List
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; - TODO: Support enum protocol for set.
+;; - TODO: Prefer a different hash-table library that doesn't rely on mutative
+;;   code.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct set xs)
+
+(defconst set-enable-testing? t
+  "Run tests when t.")
+
+(defun set-from-list (xs)
+  "Create a new set from the list XS."
+  (make-set :xs (->> xs
+                     (list-map #'dotted-new)
+                     ht-from-alist)))
+
+(defun set-new (&rest args)
+  "Create a new set from ARGS."
+  (set-from-list args))
+
+(defun set-to-list (xs)
+  "Map set XS into a list."
+  (->> xs
+       set-xs
+       ht-keys))
+
+(defun set-add (x xs)
+  "Add X to set XS."
+  (struct-update set
+                 xs
+                 (lambda (table)
+                   (let ((table-copy (ht-copy table)))
+                     (ht-set table-copy x nil)
+                     table-copy))
+                 xs))
+
+;; TODO: Ensure all `*/reduce' functions share the same API.
+(defun set-reduce (acc f xs)
+  "Return a new set by calling F on each element of XS and ACC."
+  (->> xs
+       set-to-list
+       (list-reduce acc f)))
+
+(defun set-intersection (a b)
+  "Return the set intersection between A and B."
+  (set-reduce (set-new)
+              (lambda (x acc)
+                (if (set-contains? x b)
+                    (set-add x acc)
+                  acc))
+              a))
+
+(defun set-count (xs)
+  "Return the number of elements in XS."
+  (->> xs
+       set-xs
+       ht-size))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun set-empty? (xs)
+  "Return t if XS has no elements in it."
+  (= 0 (set-count xs)))
+
+(defun set-contains? (x xs)
+  "Return t if set XS has X."
+  (ht-contains? (set-xs xs) x))
+
+;; TODO: Prefer using `ht.el' functions for this.
+(defun set-equal? (a b)
+  "Return t if A and B share the name members."
+  (ht-equal? (set-xs a)
+             (set-xs b)))
+
+(defun set-distinct? (a b)
+  "Return t if A and B have no shared members."
+  (set-empty? (set-intersection a b)))
+
+(defun set-superset? (a b)
+  "Return t if A has all of the members of B."
+  (->> b
+       set-to-list
+       (list-all? (lambda (x) (set-contains? x a)))))
+
+(defun set-subset? (a b)
+  "Return t if each member of set A is present in set B."
+  (set-superset? b a))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when set-enable-testing?
+  ;; set-distinct?
+  (prelude-assert
+   (set-distinct? (set-new 'one 'two 'three)
+                  (set-new 'a 'b 'c)))
+  (prelude-refute
+   (set-distinct? (set-new 1 2 3)
+                  (set-new 3 4 5)))
+  (prelude-refute
+   (set-distinct? (set-new 1 2 3)
+                  (set-new 1 2 3)))
+  ;; set-equal?
+  (prelude-refute
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'x 'y 'z)))
+  (prelude-refute
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'a 'b)))
+  (prelude-assert
+   (set-equal? (set-new 'a 'b 'c)
+               (set-new 'a 'b 'c)))
+  ;; set-intersection
+  (prelude-assert
+   (set-equal? (set-new 2 3)
+               (set-intersection (set-new 1 2 3)
+                                 (set-new 2 3 4))))
+  ;; set-{from,to}-list
+  (prelude-assert (equal '(1 2 3)
+                         (->> '(1 1 2 2 3 3)
+                              set-from-list
+                              set-to-list)))
+  (let ((primary-colors (set-new "red" "green" "blue")))
+    ;; set-subset?
+    (prelude-refute
+     (set-subset? (set-new "black" "grey")
+                  primary-colors))
+    (prelude-assert
+     (set-subset? (set-new "red")
+                  primary-colors))
+    ;; set-superset?
+    (prelude-refute
+     (set-superset? primary-colors
+                    (set-new "black" "grey")))
+    (prelude-assert
+     (set-superset? primary-colors
+                    (set-new "red" "green" "blue")))
+    (prelude-assert
+     (set-superset? primary-colors
+                    (set-new "red" "blue"))))
+  ;; set-empty?
+  (prelude-assert (set-empty? (set-new)))
+  (prelude-refute (set-empty? (set-new 1 2 3)))
+  ;; set-count
+  (prelude-assert (= 0 (set-count (set-new))))
+  (prelude-assert (= 2 (set-count (set-new 1 1 2 2)))))
+
+(provide 'set)
+;;; set.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/ssh.el b/users/wpcarro/emacs/.emacs.d/wpc/ssh.el
new file mode 100644
index 000000000000..2e5839c04698
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/ssh.el
@@ -0,0 +1,65 @@
+;;; ssh.el --- When working remotely -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Configuration to make remote work easier.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'tramp)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Is "ssh" preferable to "scp"?
+(setq tramp-default-method "ssh")
+
+;; Taken from: https://superuser.com/questions/179313/tramp-waiting-for-prompts-from-remote-shell
+(setq tramp-shell-prompt-pattern "^[^$>\n]*[#$%>] *\\(\[[0-9;]*[a-zA-Z] *\\)*")
+
+;; Sets the value of the TERM variable to "dumb" when logging into the remote
+;; host. This allows me to check for the value of "dumb" in my shell's init file
+;; and control the startup accordingly. You can see in the (shamefully large)
+;; commit, 0b4ef0e, that I added a check like this to my ~/.zshrc. I've since
+;; switched from z-shell to fish. I don't currently have this check in
+;; config.fish, but I may need to add it one day soon.
+(setq tramp-terminal-type "dumb")
+
+;; Maximizes the tramp debugging noisiness while I'm still learning about tramp.
+(setq tramp-verbose 10)
+
+;; As confusing as this may seem, this forces Tramp to use *my* .ssh/config
+;; options, which enable ControlMaster. In other words, disabling this actually
+;; enables ControlMaster.
+(setq tramp-use-ssh-controlmaster-options nil)
+
+(defcustom ssh-hosts '("desktop" "socrates")
+  "List of hosts to which I commonly connect.
+Note: It could be interesting to read these values from ~/.ssh-config, but
+  that's more than I need at the moment.")
+
+(defun ssh-sudo-buffer ()
+  "Open the current buffer with sudo rights."
+  (interactive)
+  (with-current-buffer (current-buffer)
+    (if (s-starts-with? "/ssh:" buffer-file-name)
+        (message "[ssh.el] calling ssh-sudo-buffer for remote files isn't currently supported")
+      (find-file (format "/sudo::%s" buffer-file-name)))))
+
+(defun ssh-cd-home ()
+  "Prompt for an SSH host and open a dired buffer for wpcarro on that machine."
+  (interactive)
+  (let ((machine (completing-read "Machine: " ssh-hosts)))
+    (find-file (format "/ssh:wpcarro@%s:~" machine))))
+
+(provide 'ssh)
+;;; ssh.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/stack.el b/users/wpcarro/emacs/.emacs.d/wpc/stack.el
new file mode 100644
index 000000000000..c90f41e7602d
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/stack.el
@@ -0,0 +1,102 @@
+;;; stack.el --- Working with stacks in Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; A stack is a LIFO queue.
+;; The design goal here is to expose an intuitive API for working with stacks in
+;; non-mutative way.
+;;
+;; TODO: Consider naming a Functor instance "Mappable."
+;; TODO: Consider naming a Foldable instance "Reduceable."
+;;
+;; TODO: Consider implementing an instance for Mappable.
+;; TODO: Consider implementing an instance for Reduceable.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'list)
+(require '>)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Create
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct stack xs)
+
+(defun stack-new ()
+  "Create an empty stack."
+  (make-stack :xs '()))
+
+(defun stack-from-list (xs)
+  "Create a new stack from the list, `XS'."
+  (list-reduce (stack-new) #'stack-push xs))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Read
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun stack-peek (xs)
+  "Look at the top element of `XS' without popping it off."
+  (->> xs
+       stack-xs
+       list-head))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Update
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun stack-push (x xs)
+  "Push `X' on `XS'."
+  (struct-update stack
+                 xs
+                 (>-> (list-cons x))
+                 xs))
+
+;; TODO: How to return something like {(list-head xs), (list-tail xs)} in Elixir
+;; TODO: How to handle popping from empty stacks?
+(defun stack-pop (xs)
+  "Return the stack, `XS', without the top element.
+Since I cannot figure out a nice way of return tuples in Elisp, if you want to
+look at the first element, use `stack-peek' before running `stack-pop'."
+  (struct-update stack
+                 xs
+                 (>-> list-tail)
+                 xs))
+
+(defun stack-map-top (f xs)
+  "Apply F to the top element of XS."
+  (->> xs
+       stack-pop
+       (stack-push (funcall f (stack-peek xs)))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Miscellaneous
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun stack-to-list (xs)
+  "Return XS as a list.
+The round-trip property of `stack-from-list' and `stack-to-list' should hold."
+  (->> xs
+       stack-xs
+       list-reverse))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Create a macro that wraps `cl-defstruct' that automatically creates
+;; things like `new', `instance?'.
+(defun stack-instance? (xs)
+  "Return t if XS is a stack."
+  (stack-p xs))
+
+(provide 'stack)
+;;; stack.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/string.el b/users/wpcarro/emacs/.emacs.d/wpc/string.el
new file mode 100644
index 000000000000..9a43f1664501
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/string.el
@@ -0,0 +1,111 @@
+;;; string.el --- Library for working with strings -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Library for working with string.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 's)
+(require 'dash)
+;; TODO: Resolve the circular dependency that this introduces.
+;; (require 'prelude)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun string-contains? (c x)
+  "Return t if X is in C."
+  (s-contains? c x))
+
+(defun string-hookify (x)
+  "Append \"-hook\" to X."
+  (s-append "-hook" x))
+
+(defun string-split (y x)
+  "Map string X into a list of strings that were separated by Y."
+  (s-split y x))
+
+(defun string-ensure-hookified (x)
+  "Ensure that X has \"-hook\" appended to it."
+  (if (s-ends-with? "-hook" x)
+      x
+    (string-hookify x)))
+
+(defun string-format (x &rest args)
+  "Format template string X with ARGS."
+  (apply #'format (cons x args)))
+
+(defun string-concat (&rest strings)
+  "Joins `STRINGS' into onto string."
+  (apply #'s-concat strings))
+
+(defun string-->symbol (string)
+  "Maps `STRING' to a symbol."
+  (intern string))
+
+(defun string-<-symbol (symbol)
+  "Maps `SYMBOL' into a string."
+  (symbol-name symbol))
+
+(defun string-prepend (prefix x)
+  "Prepend `PREFIX' onto `X'."
+  (s-concat prefix x))
+
+(defun string-append (postfix x)
+  "Appen `POSTFIX' onto `X'."
+  (s-concat x postfix))
+
+(defun string-surround (s x)
+  "Surrounds `X' one each side with `S'."
+  (->> x
+       (string-prepend s)
+       (string-append s)))
+
+;; TODO: Define a macro for defining a function and a test.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Casing
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun string-caps->kebab (x)
+  "Change the casing of `X' from CAP_CASE to kebab-case."
+  (->> x
+       s-downcase
+       (s-replace "_" "-")))
+
+(defun string-kebab->caps (x)
+  "Change the casing of X from CAP_CASE to kebab-case."
+  (->> x
+       s-upcase
+       (s-replace "-" "_")))
+
+(defun string-lower->caps (x)
+  "Change the casing of X from lowercase to CAPS_CASE."
+  (->> x
+       s-upcase
+       (s-replace " " "_")))
+
+(defun string-lower->kebab (x)
+  "Change the casing of `X' from lowercase to kebab-case."
+  (s-replace " " "-" x))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun string-instance? (x)
+  "Return t if X is a string."
+  (stringp x))
+
+(provide 'string)
+;;; string.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/struct.el b/users/wpcarro/emacs/.emacs.d/wpc/struct.el
new file mode 100644
index 000000000000..35957e834449
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/struct.el
@@ -0,0 +1,86 @@
+;;; struct.el --- Helpers for working with structs -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24.3"))
+
+;;; Commentary:
+;; Provides new macros for working with structs.  Also provides adapter
+;; interfaces to existing struct macros, that should have more intuitive
+;; interfaces.
+;;
+;; Sometimes `setf' just isn't enough.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'string)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar struct--enable-tests? t
+  "When t, run the test suite defined herein.")
+
+(defmacro struct-update (type field f xs)
+  "Apply F to FIELD in XS, which is a struct of TYPE.
+This is immutable."
+  (let ((copier (->> type
+                     symbol-name
+                     (string-prepend "copy-")
+                     intern))
+        (accessor (->> field
+                       symbol-name
+                       (string-prepend (string-concat (symbol-name type) "-"))
+                       intern)))
+    `(let ((copy (,copier ,xs)))
+       (setf (,accessor copy) (funcall ,f (,accessor copy)))
+       copy)))
+
+(defmacro struct-set (type field x xs)
+  "Immutably set FIELD in XS (struct TYPE) to X."
+  (let ((copier (->> type
+                     symbol-name
+                     (string-prepend "copy-")
+                     intern))
+        (accessor (->> field
+                       symbol-name
+                       (string-prepend (string-concat (symbol-name type) "-"))
+                       intern)))
+    `(let ((copy (,copier ,xs)))
+       (setf (,accessor copy) ,x)
+       copy)))
+
+(defmacro struct-set! (type field x xs)
+  "Set FIELD in XS (struct TYPE) to X mutably.
+This is an adapter interface to `setf'."
+  (let ((accessor (->> field
+                       symbol-name
+                       (string-prepend (string-concat (symbol-name type) "-"))
+                       intern)))
+    `(progn
+       (setf (,accessor ,xs) ,x)
+       ,xs)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when struct--enable-tests?
+  (cl-defstruct dummy name age)
+  (defvar struct--test-dummy (make-dummy :name "Roofus" :age 19))
+  (struct-set! dummy name "Doofus" struct--test-dummy)
+  (prelude-assert (string= "Doofus" (dummy-name struct--test-dummy)))
+  (let ((result (struct-set dummy name "Shoofus" struct--test-dummy)))
+    ;; Test the immutability of `struct-set'
+    (prelude-assert (string= "Doofus" (dummy-name struct--test-dummy)))
+    (prelude-assert (string= "Shoofus" (dummy-name result)))))
+
+(provide 'struct)
+;;; struct.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/symbol.el b/users/wpcarro/emacs/.emacs.d/wpc/symbol.el
new file mode 100644
index 000000000000..39450caff59e
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/symbol.el
@@ -0,0 +1,49 @@
+;;; symbol.el --- Library for working with symbols -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Library for working with symbols.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'string)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Symbols
+(defun symbol-as-string (callback x)
+  "Treat the symbol, X, as a string while applying CALLBACK to it.
+Coerce back to a symbol on the way out."
+  (->> x
+       #'symbol-name
+       callback
+       #'intern))
+
+(defun symbol-to-string (x)
+  "Map `X' into a string."
+  (string-<-symbol x))
+
+(defun symbol-hookify (x)
+  "Append \"-hook\" to X when X is a symbol."
+  (symbol-as-string #'string-hookify x))
+
+(defun symbol-ensure-hookified (x)
+  "Ensure that X has \"-hook\" appended to it when X is a symbol."
+  (symbol-as-string #'string-ensure-hookified x))
+
+(defun symbol-instance? (x)
+  "Return t if X is a symbol."
+  (symbolp x))
+
+(provide 'symbol)
+;;; symbol.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/timestring.el b/users/wpcarro/emacs/.emacs.d/wpc/timestring.el
new file mode 100644
index 000000000000..a9bf64e9a459
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/timestring.el
@@ -0,0 +1,78 @@
+;;; timestring.el --- Quickly access timestamps in different formats -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+
+;; I was making some API calls where a URL needed a `since` parameter that of an
+;; RFC 3339 encoded string.
+;;
+;; Because I didn't know what a RFC 3339 encoded
+;; string was at the time, and because I didn't know what its format was
+;; according to strftime, and because I'm most likely to forget both of these
+;; things by the next time that I need something similar, I decided to write
+;; this package so that I can accumulate a list of common time encodings.
+;;
+;; Thank you, Emacs.
+;;
+;; p.s. - I may turn this into a proper module and publish it.  But not today.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'ts)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup timestring nil
+  "Customize group for timestring configuration.")
+
+(defcustom timestring-supported-encodings
+  '(("RFC 3339" . "%Y-%m-%dT%H:%M:%SZ")
+    ;; Does anyone recognize this format?
+    ("IDK" . "%Y-%m-%d %H:%M:%S %z"))
+  "Mapping of encoding names to their format strings."
+  :group 'timestring)
+
+(defcustom timestring-supported-times
+  '(("yesterday" . timestring--yesterday)
+    ("now" . ts-now)
+    ("tomorrow" . timestring--tomorrow))
+  "Mapping of a labels to the functions that create those time objects."
+  :group 'timestring)
+
+(defun timestring--yesterday ()
+  "Return a time object for yesterday."
+  (ts-adjust 'day -1 (ts-now)))
+
+(defun timestring--tomorrow ()
+  "Return a time object for yesterday."
+  (ts-adjust 'day +1 (ts-now)))
+
+(defun timestring--completing-read (label xs)
+  "Call `completing-read' with LABEL over the collection XS."
+  (alist-get (completing-read label xs) xs nil nil #'equal))
+
+(defun timestring-copy-encoded-time ()
+  "Select a common time and an encoding.
+
+The selected time will be encoded using the selected encoding and copied onto
+your clipboard."
+  (interactive)
+  (let ((time (funcall (timestring--completing-read
+                        "Time: " timestring-supported-times)))
+        (fmt (timestring--completing-read
+              "Encoding: " timestring-supported-encodings)))
+    (kill-new (ts-format fmt time))
+    (message "Copied!")))
+
+(provide 'timestring)
+;;; timestring.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/tree.el b/users/wpcarro/emacs/.emacs.d/wpc/tree.el
new file mode 100644
index 000000000000..ae5fba7950c9
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/tree.el
@@ -0,0 +1,200 @@
+;;; tree.el --- Working with Trees -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Some friendly functions that hopefully will make working with trees cheaper
+;; and therefore more appealing!
+;;
+;; Tree terminology:
+;; - leaf: node with zero children.
+;; - root: node with zero parents.
+;; - depth: measures a node's distance from the root node.  This implies the
+;;   root node has a depth of zero.
+;; - height: measures the longest traversal from a node to a leaf.  This implies
+;;   that a leaf node has a height of zero.
+;; - balanced?
+;;
+;; Tree variants:
+;; - binary: the maximum number of children is two.
+;; - binary search: the maximum number of children is two and left sub-trees are
+;;   lower in value than right sub-trees.
+;; - rose: the number of children is variable.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'list)
+(require 'set)
+(require 'tuple)
+(require 'series)
+(require 'random)
+(require 'maybe)
+(require 'cl-lib)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct tree xs)
+
+(cl-defstruct node value children)
+
+(cl-defun tree-node (value &optional children)
+  "Create a node struct of VALUE with CHILDREN."
+  (make-node :value value
+             :children children))
+
+(defun tree-reduce-breadth (acc f xs)
+  "Reduce over XS breadth-first applying F to each x and ACC (in that order).
+Breadth-first traversals guarantee to find the shortest path in a graph.
+  They're typically more difficult to implement than DFTs and may also incur
+  higher memory costs on average than their depth-first counterparts.")
+
+;; TODO: Support :order as 'pre | 'in | 'post.
+;; TODO: Troubleshoot why I need defensive (nil? node) check.
+(defun tree-reduce-depth (acc f node)
+  "Reduce over NODE depth-first applying F to each NODE and ACC.
+F is called with each NODE, ACC, and the current depth.
+Depth-first traversals have the advantage of typically consuming less memory
+  than their breadth-first equivalents would have.  They're also typically
+  easier to implement using recursion.  This comes at the cost of not
+  guaranteeing to be able to find the shortest path in a graph."
+  (cl-labels ((do-reduce-depth
+               (acc f node depth)
+               (let ((acc-new (funcall f node acc depth)))
+                 (if (or (maybe-nil? node)
+                         (tree-leaf? node))
+                     acc-new
+                   (list-reduce
+                    acc-new
+                    (lambda (node acc)
+                      (tree-do-reduce-depth
+                       acc
+                       f
+                       node
+                       (number-inc depth)))
+                    (node-children node))))))
+    (do-reduce-depth acc f node 0)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Helpers
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun tree-height (xs)
+  "Return the height of tree XS.")
+
+;; TODO: Troubleshoot why need for (nil? node).  Similar misgiving
+;; above.
+(defun tree-leaf-depths (xs)
+  "Return a list of all of the depths of the leaf nodes in XS."
+  (list-reverse
+   (tree-reduce-depth
+    '()
+    (lambda (node acc depth)
+      (if (or (maybe-nil? node)
+              (tree-leaf? node))
+          (list-cons depth acc)
+        acc))
+    xs)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Generators
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Consider parameterizing height, forced min-max branching, random
+;; distributions, etc.
+
+;; TODO: Bail out before stack overflowing by consider branching, current-depth.
+
+(cl-defun tree-random (&optional (value-fn (lambda (_) nil))
+                                 (branching-factor 2))
+  "Randomly generate a tree with BRANCHING-FACTOR.
+
+This uses VALUE-FN to compute the node values.  VALUE-FN is called with the
+current-depth of the node.  Useful for generating test data.  Warning this
+function can overflow the stack."
+  (cl-labels ((do-random
+               (d vf bf)
+               (make-node
+                :value (funcall vf d)
+                :children (->> (series/range 0 (number-dec bf))
+                               (list-map
+                                (lambda (_)
+                                  (when (random-boolean?)
+                                    (do-random d vf bf))))))))
+    (do-random 0 value-fn branching-factor)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun tree-instance? (tree)
+  "Return t if TREE is a tree struct."
+  (node-p tree))
+
+(defun tree-leaf? (node)
+  "Return t if NODE has no children."
+  (maybe-nil? (node-children node)))
+
+(defun tree-balanced? (n xs)
+  "Return t if the tree, XS, is balanced.
+A tree is balanced if none of the differences between any two depths of two leaf
+  nodes in XS is greater than N."
+  (> n (->> xs
+            tree-leaf-depths
+            set-from-list
+            set-count
+            number-dec)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Tests
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst tree-enable-testing? t
+  "When t, test suite runs.")
+
+;; TODO: Create set of macros for a proper test suite including:
+;; - describe (arbitrarily nestable)
+;; - it (arbitrarily nestable)
+;; - line numbers for errors
+;; - accumulated output for synopsis
+;; - do we want describe *and* it? Why not a generic label that works for both?
+(when tree-enable-testing?
+  (let ((tree-a (tree-node 1
+                           (list (tree-node 2
+                                            (list (tree-node 5)
+                                                  (tree-node 6)))
+                                 (tree-node 3
+                                            (list (tree-node 7)
+                                                  (tree-node 8)))
+                                 (tree-node 4
+                                            (list (tree-node 9)
+                                                  (tree-node 10))))))
+        (tree-b (tree-node 1
+                           (list (tree-node 2
+                                            (list (tree-node 5)
+                                                  (tree-node 6)))
+                                 (tree-node 3)
+                                 (tree-node 4
+                                            (list (tree-node 9)
+                                                  (tree-node 10)))))))
+    ;; instance?
+    (prelude-assert (tree-instance? tree-a))
+    (prelude-assert (tree-instance? tree-b))
+    (prelude-refute (tree-instance? '(1 2 3)))
+    (prelude-refute (tree-instance? "oak"))
+    ;; balanced?
+    (prelude-assert (tree-balanced? 1 tree-a))
+    (prelude-refute (tree-balanced? 1 tree-b))
+    (message "Tests pass!")))
+
+(provide 'tree)
+;;; tree.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/tuple.el b/users/wpcarro/emacs/.emacs.d/wpc/tuple.el
new file mode 100644
index 000000000000..dd8e88f5c34d
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/tuple.el
@@ -0,0 +1,94 @@
+;;; tuple.el --- Tuple API for Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Work with cons cells with two elements with a familiar API for those who have
+;; worked with tuples before.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(cl-defstruct tuple first second)
+
+;; Create
+(defun tuple-new ()
+  "Return an empty tuple."
+  (make-tuple :first nil
+              :second nil))
+
+(defun tuple-from (a b)
+  "Return a new tuple from A and B."
+  (make-tuple :first a
+              :second b))
+
+(defun tuple-from-dotted (dp)
+  "Convert dotted pair, DP, into a tuple."
+  (tuple-from (car dp) (cdr dp)))
+
+;; Read
+(defun tuple-first (pair)
+  "Return the first element of PAIR."
+  (tuple-first pair))
+
+(defun tuple-second (pair)
+  "Return the second element of PAIR."
+  (tuple-second pair))
+
+;; Update
+(defun tuple-map-each (f g pair)
+  "Apply F to first, G to second in PAIR."
+  (->> pair
+       (tuple-map-first f)
+       (tuple-map-second g)))
+
+(defun tuple-map (f pair)
+  "Apply F to PAIR."
+  (let ((pair-copy (copy-tuple pair)))
+    (funcall f pair-copy)))
+
+(defun tuple-map-first (f pair)
+  "Apply function F to the first element of PAIR."
+  (let ((pair-copy (copy-tuple pair)))
+    (setf (tuple-first pair-copy) (funcall f (tuple-first pair-copy)))
+    pair-copy))
+
+(defun tuple-map-second (f pair)
+  "Apply function F to the second element of PAIR."
+  (let ((pair-copy (copy-tuple pair)))
+    (setf (tuple-second pair-copy) (funcall f (tuple-second pair-copy)))
+    pair-copy))
+
+(defun tuple-set-first (a pair)
+  "Return a new tuple with the first element set as A in PAIR."
+  (tuple-map-first (lambda (_) a) pair))
+
+(defun tuple-set-second (b pair)
+  "Return a new tuple with the second element set as B in PAIR."
+  (tuple-map-second (lambda (_) b) pair))
+
+;; Delete
+(defun tuple-delete-first (pair)
+  "Return PAIR with the first element set to nil."
+  (tuple-set-first nil pair))
+
+(defun tuple-delete-second (pair)
+  "Return PAIR with the second element set to nil."
+  (tuple-set-second nil pair))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Predicates
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun tuple-instance? (x)
+  "Return t if X is a tuple."
+  (tuple-p x))
+
+(provide 'tuple)
+;;; tuple.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/vector.el b/users/wpcarro/emacs/.emacs.d/wpc/vector.el
new file mode 100644
index 000000000000..033f8de8347d
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/vector.el
@@ -0,0 +1,85 @@
+;;; vector.el --- Working with Elisp's Vector data type -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; It might be best to think of Elisp vectors as tuples in languages like
+;; Haskell or Erlang.
+;;
+;; Not surprisingly, this API is modelled after Elixir's Tuple API.
+;;
+;; Some Elisp trivia:
+;; - "Array": Usually means vector or string.
+;; - "Sequence": Usually means list or "array" (see above).
+;;
+;; It might be a good idea to think of Array and Sequence as typeclasses in
+;; Elisp.  This is perhaps more similar to Elixir's notion of the Enum protocol.
+;;
+;; Intentionally not supporting a to-list function, because tuples can contain
+;; heterogenous types whereas lists should contain homogenous types.
+
+;;; Code:
+
+;; TODO: Consider supporting an alias named tuple for vector.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst vector-enable-tests? t
+  "When t, run the tests defined herein.")
+
+;; TODO: Consider labelling variadic functions like `vector-concat*'
+;; vs. `vector-concat'.
+(defun vector-concat (&rest args)
+  "Return a new vector composed of all vectors in `ARGS'."
+  (apply #'vconcat args))
+
+;; TODO: Here's a sketch of a protocol macro being consumed.
+;; (definstance monoid vector
+;;   :empty (lambda () []))
+
+(defun vector-prepend (x xs)
+  "Add `X' to the beginning of `XS'."
+  (vector-concat `[,x] xs))
+
+(defun vector-append (x xs)
+  "Add `X' to the end of `XS'."
+  (vector-concat xs `[,x]))
+
+(defun vector-get (i xs)
+  "Return the value in `XS' at index, `I'."
+  (aref xs i))
+
+(defun vector-set (i v xs)
+  "Set index `I' to value `V' in `XS'.
+Returns a copy of `XS' with the updates."
+  (let ((copy (vconcat [] xs)))
+    (aset copy i v)
+    copy))
+
+(defun vector-set! (i v xs)
+  "Set index `I' to value `V' in `XS'.
+This function mutates XS."
+  (aset xs i v))
+
+(when vector-enable-tests?
+  (let ((xs [1 2 3])
+        (ys [1 2 3]))
+    (prelude-assert (= 1 (vector-get 0 ys)))
+    (vector-set 0 4 ys)
+    (prelude-assert (= 1 (vector-get 0 ys)))
+    (prelude-assert (= 1 (vector-get 0 xs)))
+    (vector-set! 0 4 xs)
+    (prelude-assert (= 4 (vector-get 0 xs)))))
+
+;; TODO: Decide between "remove" and "delete" as the appropriate verbs.
+;; TODO: Implement this.
+;; (defun vector/delete (i xs)
+;;   "Remove the element at `I' in `XS'.")
+
+(provide 'vector)
+;;; vector.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/vterm-mgt.el b/users/wpcarro/emacs/.emacs.d/wpc/vterm-mgt.el
new file mode 100644
index 000000000000..ce60bab149c0
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/vterm-mgt.el
@@ -0,0 +1,129 @@
+;;; vterm-mgt.el --- Help me manage my vterm instances -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Supporting functions to instantiate vterm buffers, kill existing vterm
+;; buffers, rename vterm buffers, cycle forwards and backwards through vterm
+;; buffers.
+;;
+;; Many of the functions defined herein are intended to be bound to
+;; `vterm-mode-map'.  Some assertions are made to guard against calling
+;; functions that are intended to be called from outside of a vterm buffer.
+;; These assertions shouldn't error when the functions are bound to
+;; `vterm-mode-map'.  If for some reason, you'd like to bind these functions to
+;; a separate keymap, caveat emptor.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'dash)
+(require 'cycle)
+(require 'vterm)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup vterm-mgt nil
+  "Customization options for `vterm-mgt'.")
+
+(defcustom vterm-mgt-scroll-on-focus nil
+  "When t, call `end-of-buffer' after focusing a vterm instance."
+  :type '(boolean)
+  :group 'vterm-mgt)
+
+(defconst vterm-mgt--instances (cycle-new)
+  "A cycle tracking all of my vterm instances.")
+
+(defun vterm-mgt--instance? (b)
+  "Return t if the buffer B is a vterm instance."
+  (equal 'vterm-mode (buffer-local-value 'major-mode b)))
+
+(defmacro vterm-mgt--assert-vterm-buffer ()
+  "Error when the `current-buffer' is not a vterm buffer."
+  '(prelude-assert (vterm-mgt--instance? (current-buffer))))
+
+(defun vterm-mgt-next ()
+  "Replace the current buffer with the next item in `vterm-mgt--instances'.
+This function should be called from a buffer running vterm."
+  (interactive)
+  (vterm-mgt--assert-vterm-buffer)
+  (cycle-focus-item (current-buffer) vterm-mgt--instances)
+  (switch-to-buffer (cycle-next vterm-mgt--instances))
+  (when vterm-mgt-scroll-on-focus (end-of-buffer)))
+
+(defun vterm-mgt-prev ()
+  "Replace the current buffer with the previous item in `vterm-mgt--instances'.
+This function should be called from a buffer running vterm."
+  (interactive)
+  (vterm-mgt--assert-vterm-buffer)
+  (cycle-focus-item (current-buffer) vterm-mgt--instances)
+  (switch-to-buffer (cycle-prev vterm-mgt--instances))
+  (when vterm-mgt-scroll-on-focus (end-of-buffer)))
+
+(defun vterm-mgt-instantiate ()
+  "Create a new vterm instance.
+
+Prefer calling this function instead of `vterm'.  This function ensures that the
+  newly created instance is added to `vterm-mgt--instances'.
+
+If however you must call `vterm', if you'd like to cycle through vterm
+  instances, make sure you call `vterm-mgt-populate-cycle' to allow vterm-mgt to
+  collect any untracked vterm instances."
+  (interactive)
+  (let ((buffer (vterm)))
+    (cycle-append buffer vterm-mgt--instances)
+    (cycle-focus-item buffer vterm-mgt--instances)))
+
+(defun vterm-mgt-kill ()
+  "Kill the current buffer and remove it from `vterm-mgt--instances'.
+This function should be called from a buffer running vterm."
+  (interactive)
+  (vterm-mgt--assert-vterm-buffer)
+  (let ((buffer (current-buffer)))
+    (cycle-remove buffer vterm-mgt--instances)
+    (kill-buffer buffer)))
+
+(defun vterm-mgt-find-or-create ()
+  "Call `switch-to-buffer' on a focused vterm instance if there is one.
+
+When `cycle-focused?' returns nil, focus the first item in the cycle.  When
+there are no items in the cycle, call `vterm-mgt-instantiate' to create a vterm
+instance."
+  (interactive)
+  (if (cycle-empty? vterm-mgt--instances)
+      (vterm-mgt-instantiate)
+    (if (cycle-focused? vterm-mgt--instances)
+        (switch-to-buffer (cycle-current vterm-mgt--instances))
+      (progn
+        (cycle-jump 0 vterm-mgt--instances)
+        (switch-to-buffer (cycle-current vterm-mgt--instances))))))
+
+(defun vterm-mgt-rename-buffer (name)
+  "Rename the current buffer ensuring that its NAME is wrapped in *vterm*<...>.
+This function should be called from a buffer running vterm."
+  (interactive "SRename vterm buffer: ")
+  (vterm-mgt--assert-vterm-buffer)
+  (rename-buffer (format "vterm<%s>" name)))
+
+(defun vterm-mgt-repopulate-cycle ()
+  "Fill `vterm-mgt--instances' with the existing vterm buffers.
+
+If for whatever reason, the state of `vterm-mgt--instances' is corrupted and
+  misaligns with the state of vterm buffers in Emacs, use this function to
+  restore the state."
+  (interactive)
+  (setq vterm-mgt--instances
+        (->> (buffer-list)
+             (-filter #'vterm-mgt--instance?)
+             cycle-from-list)))
+
+(provide 'vterm-mgt)
+;;; vterm-mgt.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/window-manager.el b/users/wpcarro/emacs/.emacs.d/wpc/window-manager.el
new file mode 100644
index 000000000000..6030461da61b
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/window-manager.el
@@ -0,0 +1,354 @@
+;;; window-manager.el --- Functions augmenting my usage of EXWM -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; I switched to EXWM from i3, and I haven't looked back.  One day I may write a
+;; poem declaring my love for Emacs and EXWM.  For now, I haven't the time.
+
+;; Wish list:
+;; - TODO: Support different startup commands and layouts depending on laptop or
+;;   desktop.
+;; - TODO: Support a Music named-workspace.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'alert)
+(require 'al)
+(require 'prelude)
+(require 'string)
+(require 'cycle)
+(require 'set)
+(require 'kbd)
+(require 'ivy-helpers)
+(require 'display)
+(require 'vterm-mgt)
+(require 'dash)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Associate `window-purpose' window-layouts with each of these named
+;; workspaces.
+
+;; TODO: Associate KBDs for each of these named-layouts.
+
+;; TODO: Decide between window-manager, exwm, or some other namespace.
+
+;; TODO: Support (cycle-from-list '(current previous)) to toggle back and forth
+;; between most recent workspace.
+
+;; TODO: Support ad hoc cycle for loading a few workspaces that can be cycled
+;; between. (cycle-from-list '("Project" "Workspace"))
+
+;; TODO: Consider supporting a workspace for Racket, Clojure, Common Lisp,
+;; Haskell, Elixir, and a few other languages. These could behave very similarly
+;; to repl.it, which I've wanted to have locally for awhile now.
+
+;; TODO: Support MRU cache of workspaces for easily switching back-and-forth
+;; between workspaces.
+
+(cl-defstruct window-manager--named-workspace label kbd display)
+
+(defconst window-manager--install-kbds? t
+  "When t, install the keybindings to switch between named-workspaces.")
+
+;; TODO: Consume `cache/touch' after changing workspaces.  Use this to enable
+;; cycling through workspaces.
+
+(defconst window-manager--named-workspaces
+  (list (make-window-manager--named-workspace
+         :label "Web Browsing"
+         :kbd "c"
+         :display display-4k-horizontal)
+        (make-window-manager--named-workspace
+         :label "Coding"
+         :kbd "d"
+         :display display-4k-horizontal)
+        (make-window-manager--named-workspace
+         :label "Vertical"
+         :kbd "h"
+         :display display-4k-vertical)
+        (make-window-manager--named-workspace
+         :label "Laptop"
+         :kbd "p"
+         :display display-laptop))
+  "List of `window-manager--named-workspace' structs.")
+
+;; Assert that no two workspaces share KBDs.
+(prelude-assert (= (list-length window-manager--named-workspaces)
+                   (->> window-manager--named-workspaces
+                        (list-map #'window-manager--named-workspace-kbd)
+                        set-from-list
+                        set-count)))
+
+(defun window-manager--alert (x)
+  "Message X with a structured format."
+  (alert (string-concat "[exwm] " x)))
+
+;; Use Emacs as my primary window manager.
+(use-package exwm
+  :config
+  (require 'exwm-config)
+
+  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+  ;; Multiple Displays
+  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+  (require 'exwm-randr)
+  (exwm-randr-enable)
+  (setq exwm-randr-workspace-monitor-plist
+        (->> window-manager--named-workspaces
+             (-map-indexed (lambda (i x)
+                             (list i (window-manager--named-workspace-display x))))
+             -flatten))
+  (setq exwm-workspace-number (list-length window-manager--named-workspaces))
+  (setq exwm-input-simulation-keys
+        ;; TODO: Consider supporting M-d and other readline style KBDs.
+        '(([?\C-b] . [left])
+          ([?\M-b] . [C-left])
+          ([?\C-f] . [right])
+          ([?\M-f] . [C-right])
+          ([?\C-p] . [up])
+          ([?\C-n] . [down])
+          ([?\C-a] . [home])
+          ([?\C-e] . [end])
+          ([?\C-d] . [delete])
+          ;; TODO: Assess whether or not this is a good idea.
+          ;; TODO: Ensure C-c copies.
+          ([?\C-c] . [C-c])))
+  (exwm-enable))
+
+;; Here is the code required to allow EXWM to cycle workspaces.
+(defconst window-manager--workspaces
+  (->> window-manager--named-workspaces
+       cycle-from-list)
+  "Cycle of the my EXWM workspaces.")
+
+(prelude-assert
+ (= exwm-workspace-number
+    (list-length window-manager--named-workspaces)))
+
+(defun window-manager-next-workspace ()
+  "Cycle forwards to the next workspace."
+  (interactive)
+  (window-manager--change-workspace (cycle-next window-manager--workspaces)))
+
+(defun window-manager-prev-workspace ()
+  "Cycle backwards to the previous workspace."
+  (interactive)
+  (window-manager--change-workspace (cycle-prev window-manager--workspaces)))
+
+;; TODO: Create friendlier API for working with EXWM.
+
+;; Here is the code required to toggle EXWM's modes.
+(defun window-manager--line-mode ()
+  "Switch exwm to line-mode."
+  (call-interactively #'exwm-input-grab-keyboard)
+  (window-manager--alert "Switched to line-mode"))
+
+(defun window-manager--char-mode ()
+  "Switch exwm to char-mode."
+  (call-interactively #'exwm-input-release-keyboard)
+  (window-manager--alert "Switched to char-mode"))
+
+(defconst window-manager--modes
+  (cycle-from-list (list #'window-manager--char-mode
+                         #'window-manager--line-mode))
+  "Functions to switch exwm modes.")
+
+(defun window-manager-toggle-mode ()
+  "Switch between line- and char- mode."
+  (interactive)
+  (with-current-buffer (window-buffer)
+    (when (eq major-mode 'exwm-mode)
+      (funcall (cycle-next window-manager--modes)))))
+
+;; Ensure exwm apps open in char-mode.
+(add-hook 'exwm-manage-finish-hook #'window-manager--char-mode)
+
+;; Interface to the Linux password manager
+;; TODO: Consider writing a better client for this.
+(use-package ivy-pass)
+
+;; TODO: How do I handle this dependency?
+(defconst window-manager--preferred-browser "google-chrome"
+  "My preferred web browser.")
+
+;; TODO: Consider replacing the `ivy-read' call with something like `hydra' that
+;; can provide a small mode for accepting user-input.
+;; TODO: Put this somewhere more diliberate.
+
+;; TODO: Configure the environment variables for xsecurelock so that the font is
+;; smaller, different, and the glinux wallpaper doesn't show.
+;; - XSECURELOCK_FONT="InputMono-Black 10"
+;; - XSECURE_SAVER=""
+;; - XSECURE_LOGO_IMAGE=""
+;; Maybe just create a ~/.xsecurelockrc
+;; TODO: Is there a shell-command API that accepts an alist and serializes it
+;; into variables to pass to the shell command?
+(defconst window-manager--xsecurelock
+  "/usr/share/goobuntu-desktop-files/xsecurelock.sh"
+  "Path to the proper xsecurelock executable.
+The other path to xsecurelock is /usr/bin/xsecurelock, which works fine, but it
+is not optimized for Goobuntu devices.  Goobuntu attempts to check a user's
+password using the network.  When there is no network connection available, the
+login attempts fail with an \"unknown error\", which isn't very helpful.  To
+avoid this, prefer the goobuntu wrapper around xsecurelock when on a goobuntu
+device.  This all relates to PAM (i.e. pluggable authentication modules).")
+
+(defun window-manager-logout ()
+  "Prompt the user for options for logging out, shutting down, etc.
+
+The following options are supported:
+- Lock
+- Logout
+- Suspend
+- Hibernate
+- Reboot
+- Shutdown
+
+Ivy is used to capture the user's input."
+  (interactive)
+  (let* ((name->cmd `(("Lock" .
+                       (lambda ()
+                         (shell-command window-manager--xsecurelock)))
+                      ("Logout" .
+                       (lambda ()
+                         (let ((default-directory "/sudo::"))
+                           (shell-command "systemctl stop lightdm"))))
+                      ("Suspend" .
+                       (lambda ()
+                         (shell-command "systemctl suspend")))
+                      ("Hibernate" .
+                       (lambda ()
+                         (shell-command "systemctl hibernate")))
+                      ("Reboot" .
+                       (lambda ()
+                         (let ((default-directory "/sudo::"))
+                           (shell-command "reboot"))))
+                      ("Shutdown" .
+                       (lambda ()
+                         (let ((default-directory "/sudo::"))
+                           (shell-command "shutdown now")))))))
+    (funcall
+     (lambda ()
+       (funcall (al-get (ivy-read "System: " (al-keys name->cmd))
+                        name->cmd))))))
+
+(defun window-manager--label->index (label workspaces)
+  "Return the index of the workspace in WORKSPACES named LABEL."
+  (let ((index (-elem-index label (-map #'window-manager--named-workspace-label
+                                        workspaces))))
+    (if index index (error (format "No workspace found for label: %s" label)))))
+
+(defun window-manager--register-kbd (workspace)
+  "Registers a keybinding for WORKSPACE struct.
+Currently using super- as the prefix for switching workspaces."
+  (let ((handler (lambda ()
+                   (interactive)
+                   (window-manager--switch
+                    (window-manager--named-workspace-label workspace))))
+        (key (window-manager--named-workspace-kbd workspace)))
+    (exwm-input-set-key
+     (kbd-for 'workspace key)
+     handler)))
+
+(defun window-manager--change-workspace (workspace)
+  "Switch EXWM workspaces to the WORKSPACE struct."
+  (exwm-workspace-switch
+   (window-manager--label->index
+    (window-manager--named-workspace-label workspace)
+    window-manager--named-workspaces))
+  (window-manager--alert
+   (string-format "Switched to: %s"
+                  (window-manager--named-workspace-label workspace))))
+
+(defun window-manager--switch (label)
+  "Switch to a named workspaces using LABEL."
+  (cycle-focus (lambda (x)
+                 (equal label
+                        (window-manager--named-workspace-label x)))
+               window-manager--workspaces)
+  (window-manager--change-workspace (cycle-current window-manager--workspaces)))
+
+(exwm-input-set-key (kbd "C-S-f") #'window-manager-toggle-previous)
+
+(defun window-manager-toggle-previous ()
+  "Focus the previously active EXWM workspace."
+  (interactive)
+  (window-manager--change-workspace
+   (cycle-focus-previous! window-manager--workspaces)))
+
+(defun window-manager--exwm-buffer? (x)
+  "Return t if buffer X is an EXWM buffer."
+  (equal 'exwm-mode (buffer-local-value 'major-mode x)))
+
+(defun window-manager--application-name (buffer)
+  "Return the name of the application running in the EXWM BUFFER.
+This function asssumes that BUFFER passes the `window-manager--exwm-buffer?'
+predicate."
+  (with-current-buffer buffer exwm-class-name))
+
+;; TODO: Support disambiguating between two or more instances of the same
+;; application. For instance if two `exwm-class-name' values are
+;; "Google-chrome", find a encode this information in the `buffer-alist'.
+(defun window-manager-switch-to-exwm-buffer ()
+  "Use `completing-read' to focus an EXWM buffer."
+  (interactive)
+  (let* ((buffer-alist (->> (buffer-list)
+                            (-filter #'window-manager--exwm-buffer?)
+                            (-map
+                             (lambda (buffer)
+                               (cons (window-manager--application-name buffer)
+                                     buffer)))))
+         (label (completing-read "Switch to EXWM buffer: " buffer-alist)))
+    (exwm-workspace-switch-to-buffer
+     (al-get label buffer-alist))))
+
+(when window-manager--install-kbds?
+  (progn
+    (->> window-manager--named-workspaces
+         (list-map #'window-manager--register-kbd))
+    (window-manager--alert "Registered workspace KBDs!")))
+
+(defun window-manager-current-workspace ()
+  "Output the label of the currently active workspace."
+  (->> window-manager--workspaces
+       cycle-current
+       window-manager--named-workspace-label))
+
+(defun window-manager-swap-workspaces ()
+  "Prompt the user to switch the current workspace with another."
+  (interactive)
+  (let* ((selection (->> window-manager--named-workspaces
+                         (-map #'window-manager--named-workspace-label)
+                         (-reject
+                          (lambda (x)
+                            (s-equals? x (window-manager-current-workspace))))
+                         (completing-read
+                          (format "Swap current workspace (i.e. \"%s\") with: "
+                                  (window-manager-current-workspace)))))
+         (i (-find-index (lambda (x)
+                           (s-equals? selection (window-manager--named-workspace-label x)))
+                                 window-manager--named-workspaces)))
+    (exwm-workspace-swap exwm-workspace--current (elt exwm-workspace--list i))))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Startup Applications in `window-manager--named-workspaces'
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(add-hook 'exwm-init-hook
+          (lambda ()
+            (display-arrange-primary)
+            (window-manager--switch "Coding")))
+
+(provide 'window-manager)
+;;; window-manager.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/window.el b/users/wpcarro/emacs/.emacs.d/wpc/window.el
new file mode 100644
index 000000000000..ee3c109b79b4
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/window.el
@@ -0,0 +1,41 @@
+;;; window.el --- Working with windows -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Utilities to make CRUDing windows in Emacs easier.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'macros)
+(require 'maybe)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun window-find (name)
+  "Find a window by the NAME of the buffer it's hosting."
+  (let ((buffer (get-buffer name)))
+    (if (maybe-some? buffer)
+        (get-buffer-window buffer)
+      nil)))
+
+;; TODO: Find a way to incorporate these into function documentation.
+(macros-comment
+ (window-find "*scratch*"))
+
+(defun window-delete (window)
+  "Delete the WINDOW reference."
+  (delete-window window))
+
+(provide 'window)
+;;; window.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-clojure.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-clojure.el
new file mode 100644
index 000000000000..025ef9aab988
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-clojure.el
@@ -0,0 +1,72 @@
+;;; wpc-clojure.el --- My Clojure preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Hosting my Clojure tooling preferences
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package clojure-mode
+  :config
+  ;; from Ryan Schmukler:
+  (setq cljr-magic-require-namespaces
+        '(("io" . "clojure.java.io")
+          ("sh" . "clojure.java.shell")
+          ("jdbc" . "clojure.java.jdbc")
+          ("set" . "clojure.set")
+          ("time" . "java-time")
+          ("str" . "cuerdas.core")
+          ("path" . "pathetic.core")
+          ("walk" . "clojure.walk")
+          ("zip" . "clojure.zip")
+          ("async" . "clojure.core.async")
+          ("component" . "com.stuartsierra.component")
+          ("http" . "clj-http.client")
+          ("url" . "cemerick.url")
+          ("sql" . "honeysql.core")
+          ("csv" . "clojure.data.csv")
+          ("json" . "cheshire.core")
+          ("s" . "clojure.spec.alpha")
+          ("fs" . "me.raynes.fs")
+          ("ig" . "integrant.core")
+          ("cp" . "com.climate.claypoole")
+          ("re-frame" . "re-frame.core")
+          ("rf" . "re-frame.core")
+          ("re" . "reagent.core")
+          ("reagent" . "reagent.core")
+          ("u.core" . "utopia.core")
+          ("gen" . "clojure.spec.gen.alpha"))))
+
+(use-package cider
+  :config
+  (general-define-key
+    :keymaps 'cider-repl-mode-map
+    "C-l"    #'cider-repl-clear-buffer
+    "C-u"    #'kill-whole-line
+    "<up>"   #'cider-repl-previous-input
+    "<down>" #'cider-repl-next-input)
+  (general-define-key
+   :keymaps 'clojure-mode-map
+   :states '(normal)
+   :prefix "<SPC>"
+   "x" #'cider-eval-defun-at-point
+   "X" #'cider-eval-buffer
+   "d" #'cider-symbol-at-point)
+  (setq cider-prompt-for-symbol nil))
+
+(provide 'wpc-clojure)
+;;; wpc-clojure.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-company.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-company.el
new file mode 100644
index 000000000000..03535621cf2a
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-company.el
@@ -0,0 +1,42 @@
+;;; wpc-company.el --- Autocompletion package, company, preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; Hosts my company mode preferences
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; autocompletion client
+(use-package company
+  :config
+  (general-define-key
+    :keymaps 'company-active-map
+    "C-j" #'company-select-next
+    "C-n" #'company-select-next
+    "C-k" #'company-select-previous
+    "C-p" #'company-select-previous
+    "C-d" #'company-show-doc-buffer)
+  (setq company-tooltip-align-annotations t)
+  (setq company-idle-delay 0)
+  (setq company-show-numbers t)
+  (setq company-minimum-prefix-length 2)
+  (setq company-dabbrev-downcase nil
+        company-dabbrev-ignore-case t)
+  (global-company-mode))
+
+(provide 'wpc-company)
+;;; wpc-company.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-dired.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-dired.el
new file mode 100644
index 000000000000..bd2805c7369c
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-dired.el
@@ -0,0 +1,53 @@
+;;; wpc-dired.el --- My dired preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "25.1"))
+
+;;; Commentary:
+;; File management in Emacs, if learned and configured properly, should be
+;; capable to reduce my dependency on the terminal.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'macros)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(progn
+  (require 'dired)
+  (setq dired-recursive-copies 'always
+        dired-recursive-deletes 'top
+        dired-dwim-target t)
+  (setq dired-listing-switches "-la --group-directories-first")
+  (general-define-key
+   :keymaps 'dired-mode-map
+   :states '(normal)
+   ;; Overriding some KBDs defined in the evil-collection module.
+   "o" #'dired-find-file-other-window
+   "<SPC>" nil ;; This unblocks some of my leader-prefixed KBDs.
+   "s" nil ;; This unblocks my window-splitting KBDs.
+   "c" #'find-file
+   "f" #'project-find-file
+   "-" (lambda () (interactive) (find-alternate-file "..")))
+  (general-add-hook 'dired-mode-hook
+                    (list (macros-enable dired-hide-details-mode)
+                          #'auto-revert-mode)))
+
+(progn
+  (require 'locate)
+  (general-define-key
+   :keymaps 'locate-mode-map
+   :states 'normal
+   "o" #'dired-find-file-other-window))
+
+(provide 'wpc-dired)
+;;; wpc-dired.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-elixir.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-elixir.el
new file mode 100644
index 000000000000..0b5e3917139e
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-elixir.el
@@ -0,0 +1,28 @@
+;;; wpc-elixir.el --- Elixir / Erland configuration -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; My preferences for working with Elixir / Erlang projects
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'macros)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package elixir-mode
+  :config
+  (macros-add-hook-before-save 'elixir-mode-hook #'elixir-format))
+
+(provide 'wpc-elixir)
+;;; wpc-elixir.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-flycheck.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-flycheck.el
new file mode 100644
index 000000000000..1f32ce51361e
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-flycheck.el
@@ -0,0 +1,18 @@
+;;; wpc-flycheck.el --- My flycheck configuration -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Hosts my Flycheck preferences
+
+;;; Code:
+
+(use-package flycheck
+  :config
+  (global-flycheck-mode))
+
+(provide 'wpc-flycheck)
+;;; wpc-flycheck.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-golang.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-golang.el
new file mode 100644
index 000000000000..d73249334f89
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-golang.el
@@ -0,0 +1,48 @@
+;;; wpc-golang.el --- Tooling preferences for Go -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Tooling support for golang development.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'macros)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Support jumping to go source code for fmt.Println, etc.
+
+;; I'm unsure if this belongs in wpc-golang.el because it's a generic setting,
+;; but because go is the first languages I've encountered that enforces tab
+;; usage (I think) I'm configuring it.
+(setq-default tab-width 4)
+
+(use-package go-mode
+  :config
+  (setq gofmt-command "goimports")
+  ;; TODO: Consider configuring `xref-find-definitions' to use `godef-jump'
+  ;; instead of shadowing the KBD here.
+  (general-define-key
+   :states '(normal)
+   :keymaps '(go-mode-map)
+   "M-." #'godef-jump)
+  ;; Support calling M-x `compile'.
+  (add-hook 'go-mode-hook (lambda ()
+                            (set (make-local-variable 'compile-command)
+                                 "go build -v")))
+  (macros-add-hook-before-save 'go-mode-hook #'gofmt-before-save))
+
+(provide 'wpc-golang)
+;;; wpc-golang.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-haskell.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-haskell.el
new file mode 100644
index 000000000000..f9ed8552e0be
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-haskell.el
@@ -0,0 +1,62 @@
+;;; wpc-haskell.el --- My Haskell preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Hosts my Haskell development preferences
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'macros)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; font-locking, glyph support, etc
+(use-package haskell-mode
+  :config
+  (macros-add-hook-before-save 'haskell-mode #'haskell-align-imports))
+
+;; LSP support
+(use-package lsp-haskell
+  :after (haskell-mode)
+  :config
+  (setq lsp-haskell-process-path-hie "hie-wrapper")
+  (add-hook 'haskell-mode-hook #'lsp-haskell-enable)
+  (add-hook 'haskell-mode-hook #'flycheck-mode))
+
+;; Test toggling
+(defun wpc-haskell-module->test ()
+  "Jump from a module to a test."
+  (let ((filename (->> buffer-file-name
+                       (s-replace "/src/" "/test/")
+                       (s-replace ".hs" "Test.hs")
+                       find-file)))
+    (make-directory (f-dirname filename) t)
+    (find-file filename)))
+
+(defun wpc-haskell-test->module ()
+  "Jump from a test to a module."
+  (let ((filename (->> buffer-file-name
+                       (s-replace "/test/" "/src/")
+                       (s-replace "Test.hs" ".hs"))))
+    (make-directory (f-dirname filename) t)
+    (find-file filename)))
+
+(defun wpc-haskell-test<->module ()
+  "Toggle between test and module in Haskell."
+  (interactive)
+  (if (s-contains? "/src/" buffer-file-name)
+      (wpc-haskell-module->test)
+    (wpc-haskell-test->module)))
+
+(provide 'wpc-haskell)
+;;; wpc-haskell.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-javascript.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-javascript.el
new file mode 100644
index 000000000000..da84df66d409
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-javascript.el
@@ -0,0 +1,99 @@
+;;; wpc-javascript.el --- My Javascript preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This module hosts my Javascript tooling preferences.  This also includes
+;; tooling for TypeScript and other frontend tooling.  Perhaps this module will
+;; change names to more accurately reflect that.
+;;
+;; Depends
+;; - yarn global add prettier
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; Constants
+(defconst wpc-javascript--js-hooks
+  '(js-mode-hook
+    web-mode-hook
+    typescript-mode-hook
+    js2-mode-hook
+    rjsx-mode-hook)
+  "All of the commonly used hooks for Javascript buffers.")
+
+(defconst wpc-javascript--frontend-hooks
+  (-insert-at 0 'css-mode-hook wpc-javascript--js-hooks)
+  "All of the commonly user hooks for frontend development.")
+
+;; frontend indentation settings
+(setq typescript-indent-level 2
+      js-indent-level 2
+      css-indent-offset 2)
+
+;; Flow for Javascript
+(use-package add-node-modules-path
+  :config
+  (general-add-hook wpc-javascript--js-hooks #'add-node-modules-path))
+
+(use-package web-mode
+  :mode "\\.html\\'"
+  :config
+  (setq web-mode-css-indent-offset 2)
+  (setq web-mode-code-indent-offset 2)
+  (setq web-mode-markup-indent-offset 2))
+
+;; JSX highlighting
+(use-package rjsx-mode
+  :config
+  (general-unbind rjsx-mode-map "<" ">" "C-d")
+  (general-nmap
+    :keymaps 'rjsx-mode-map
+    "K" #'flow-minor-type-at-pos)
+  (setq js2-mode-show-parse-errors nil
+        js2-mode-show-strict-warnings nil))
+
+(progn
+  (defun wpc-javascript-tide-setup ()
+    (interactive)
+    (tide-setup)
+    (flycheck-mode 1)
+    (setq flycheck-check-syntax-automatically '(save mode-enabled))
+    (eldoc-mode 1)
+    (tide-hl-identifier-mode 1)
+    (company-mode 1))
+  (use-package tide
+    :config
+    (add-hook 'typescript-mode-hook #'wpc-javascript-tide-setup))
+  (require 'web-mode)
+  (add-to-list 'auto-mode-alist '("\\.tsx\\'" . web-mode))
+  (add-hook 'web-mode-hook
+            (lambda ()
+              (when (string-equal "tsx" (f-ext buffer-file-name))
+                (wpc-javascript-tide-setup))))
+  (flycheck-add-mode 'typescript-tslint 'web-mode))
+
+;; JS autoformatting
+(use-package prettier-js
+  :config
+  (general-add-hook wpc-javascript--frontend-hooks #'prettier-js-mode))
+
+;; Support Elm
+(use-package elm-mode
+  :config
+  (add-hook 'elm-mode-hook #'elm-format-on-save-mode))
+
+(provide 'wpc-javascript)
+;;; wpc-javascript.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-lisp.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-lisp.el
new file mode 100644
index 000000000000..f4f8c6931582
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-lisp.el
@@ -0,0 +1,116 @@
+;;; wpc-lisp.el --- Generic LISP preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; parent (up)
+;; child (down)
+;; prev-sibling (left)
+;; next-sibling (right)
+
+;;; Code:
+
+;; TODO: Consider having a separate module for each LISP dialect.
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst wpc-lisp--hooks
+  '(lisp-mode-hook
+    emacs-lisp-mode-hook
+    clojure-mode-hook
+    clojurescript-mode-hook
+    racket-mode-hook)
+  "List of LISP modes.")
+
+(use-package sly
+  :config
+  (setq inferior-lisp-program "sbcl")
+  (general-define-key
+   :keymaps 'sly-mode-map
+   :states '(normal)
+   :prefix "<SPC>"
+   "x" #'sly-eval-defun
+   "X" #'sly-eval-buffer
+   "d" #'sly-describe-symbol))
+
+(use-package rainbow-delimiters
+  :config
+  (general-add-hook wpc-lisp--hooks #'rainbow-delimiters-mode))
+
+(use-package racket-mode
+  :config
+  (general-define-key
+   :keymaps 'racket-mode-map
+   :states 'normal
+   :prefix "<SPC>"
+   "x" #'racket-send-definition
+   "X" #'racket-run
+   "d" #'racket-describe)
+  (setq racket-program "~/.nix-profile/bin/racket"))
+
+(use-package lispyville
+  :init
+  (defconst wpc-lisp--lispyville-key-themes
+    '(c-w
+      operators
+      text-objects
+      prettify
+      commentary
+      slurp/barf-cp
+      wrap
+      additional
+      additional-insert
+      additional-wrap
+      escape)
+    "All available key-themes in Lispyville.")
+  :config
+  (general-add-hook wpc-lisp--hooks #'lispyville-mode)
+  (lispyville-set-key-theme wpc-lisp--lispyville-key-themes)
+  (progn
+    (general-define-key
+     :keymaps 'lispyville-mode-map
+     :states 'motion
+     ;; first unbind
+     "M-h" nil
+     "M-l" nil)
+    (general-define-key
+     :keymaps 'lispyville-mode-map
+     :states 'normal
+     ;; first unbind
+     "M-j" nil
+     "M-k" nil
+     ;; second rebind
+     "C-s-h" #'lispyville-drag-backward
+     "C-s-l" #'lispyville-drag-forward
+     "C-s-e" #'lispyville-end-of-defun
+     "C-s-a" #'lispyville-beginning-of-defun)))
+
+;; Elisp
+(use-package elisp-slime-nav
+  :config
+  (general-add-hook 'emacs-lisp-mode #'ielm-mode))
+
+(general-define-key
+ :keymaps 'emacs-lisp-mode-map
+ :prefix "<SPC>"
+ :states 'normal
+ "x" #'eval-defun
+ "X" #'eval-buffer
+ "d" (lambda ()
+       (interactive)
+       (with-current-buffer (current-buffer)
+         (helpful-function (symbol-at-point)))))
+
+(provide 'wpc-lisp)
+;;; wpc-lisp.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-misc.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-misc.el
new file mode 100644
index 000000000000..574162fbfd82
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-misc.el
@@ -0,0 +1,315 @@
+;;; wpc-misc.el --- Hosting miscellaneous configuration -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+
+;;; Commentary:
+;; This is the home of any configuration that couldn't find a better home.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'project)
+(require 'f)
+(require 'dash)
+(require 'constants)
+(require 'region)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(setq display-time-string-forms
+      '((format-time-string "%H:%M %a %b %d")))
+(display-time-mode 1)
+
+;; Remove the boilerplate in the *scratch* buffer
+(setq initial-scratch-message "")
+
+;; disable custom variable entries from being written to ~/.emacs.d/init.el
+(setq custom-file (f-join user-emacs-directory "custom.el"))
+(load custom-file 'noerror)
+
+;; integrate Emacs with X11 clipboard
+(setq select-enable-primary t)
+(setq select-enable-clipboard t)
+(general-def 'insert
+  "s-v" #'clipboard-yank
+  "C-S-v" #'clipboard-yank)
+
+;; transparently edit compressed files
+(auto-compression-mode t)
+
+;; autowrap when over the fill-column
+(setq-default auto-fill-function #'do-auto-fill)
+
+;; link to Emacs source code
+;; TODO: Update this link.
+(setq find-function-C-source-directory
+      "~/Dropbox/programming/emacs/src")
+
+;; change emacs prompts from "yes or no" -> "y or n"
+(fset 'yes-or-no-p 'y-or-n-p)
+
+;; open photos in Emacs
+(auto-image-file-mode 1)
+
+;; disable line-wrapping
+(setq-default truncate-lines 1)
+
+;; shell file indentation
+(setq sh-basic-offset 2)
+(setq sh-indentation 2)
+
+;; Emacs library that interfaces with my Linux password manager.
+(use-package password-store)
+
+(use-package vterm
+  :config
+  (general-define-key
+   :keymaps '(vterm-mode-map)
+   :states '(insert)
+   "C-S-v" #'vterm-yank)
+  (general-define-key
+   :keymaps '(vterm-mode-map)
+   :states '(normal)
+   "K" #'evil-scroll-line-up
+   "J" #'evil-scroll-line-down
+   "C-b" #'evil-scroll-page-up
+   "C-f" #'evil-scroll-page-down))
+
+;; Use en Emacs buffer as a REST client.
+;; For more information: http://emacsrocks.com/e15.html
+(use-package restclient)
+
+;; Run `package-lint' before publishing to MELPA.
+(use-package package-lint)
+
+;; Parser combinators in Elisp.
+(use-package parsec)
+
+;; disable company mode when editing markdown
+;; TODO: move this out of wpc-misc.el and into a later file to call
+;; `(disable company-mode)'
+(use-package markdown-mode
+  :config
+  ;; TODO: Add assertion that pandoc is installed and it is accessible from
+  ;; Emacs.
+  (setq markdown-command "pandoc")
+  (setq markdown-split-window-direction 'right)
+  ;; (add-hook 'markdown-mode-hook #'markdown-live-preview-mode)
+  )
+
+(use-package alert)
+
+(use-package refine)
+
+;; Required by some google-emacs package commands.
+(use-package deferred)
+
+;; git integration
+(use-package magit
+  :config
+  (add-hook 'git-commit-setup-hook
+            (lambda ()
+              (company-mode -1)
+              (flyspell-mode 1)))
+  (setq magit-display-buffer-function
+        #'magit-display-buffer-fullframe-status-v1))
+
+(use-package magit-popup)
+
+;; http
+(use-package request)
+
+;; perl-compatible regular expressions
+(use-package pcre2el)
+
+;; alternative to help
+(use-package helpful)
+
+;; If called from an existing helpful-mode buffer, reuse that buffer; otherwise,
+;; call `pop-to-buffer'.
+(setq helpful-switch-buffer-function
+      (lambda (buffer-or-name)
+        (if (eq major-mode 'helpful-mode)
+            (switch-to-buffer buffer-or-name)
+          (pop-to-buffer buffer-or-name))))
+
+;; Emacs integration with direnv
+(use-package direnv
+  :config
+  (direnv-mode))
+
+;; Superior Elisp library for working with dates and times.
+;; TODO: Put this where my other installations for dash.el, s.el, a.el, and
+;; other utility Elisp libraries are located.
+(use-package ts)
+
+;; persist history etc b/w Emacs sessions
+(setq desktop-save 'if-exists)
+(desktop-save-mode 1)
+(setq desktop-globals-to-save
+      (append '((extended-command-history . 30)
+                (file-name-history        . 100)
+                (grep-history             . 30)
+                (compile-history          . 30)
+                (minibuffer-history       . 50)
+                (query-replace-history    . 60)
+                (read-expression-history  . 60)
+                (regexp-history           . 60)
+                (regexp-search-ring       . 20)
+                (search-ring              . 20)
+                (shell-command-history    . 50)
+                tags-file-name
+                register-alist)))
+
+;; configure ibuffer
+(setq ibuffer-default-sorting-mode 'major-mode)
+
+;; config Emacs to use $PATH values
+(use-package exec-path-from-shell
+  :if (memq window-system '(mac ns))
+  :config
+  (exec-path-from-shell-initialize))
+
+;; Emacs autosave, backup, interlocking files
+(setq auto-save-default nil
+      make-backup-files nil
+      create-lockfiles nil)
+
+;; ensure code wraps at 80 characters by default
+(setq-default fill-column constants-fill-column)
+
+(put 'narrow-to-region 'disabled nil)
+
+;; trim whitespace on save
+(add-hook 'before-save-hook #'delete-trailing-whitespace)
+
+;; call `git secret hide` after saving secrets.json
+(add-hook 'after-save-hook
+          (lambda ()
+            (when (f-equal? (buffer-file-name)
+                            (f-join constants-briefcase "secrets.json"))
+              (shell-command "git secret hide"))))
+
+;; use tabs instead of spaces
+(setq-default indent-tabs-mode nil)
+
+;; automatically follow symlinks
+(setq vc-follow-symlinks t)
+
+;; fullscreen settings
+(setq ns-use-native-fullscreen nil)
+
+(use-package yasnippet
+  :config
+  (setq yas-snippet-dirs (list (f-join user-emacs-directory "snippets")))
+  (yas-global-mode 1))
+
+(use-package projectile
+  :config
+  (projectile-mode t))
+
+;; TODO: Consider moving this into a briefcase.el module.
+(defun wpc-misc--briefcase-find (dir)
+  "Find the default.nix nearest to DIR."
+  ;; I use 'vc only at the root of my monorepo because 'transient doesn't use my
+  ;; .gitignore, which slows things down. Ideally, I could write a version that
+  ;; behaves like 'transient but also respects my monorepo's .gitignore and any
+  ;; ancestor .gitignore files.
+  (if (f-equal? constants-briefcase dir)
+      (cons 'vc dir)
+    (when (f-ancestor-of? constants-briefcase dir)
+      (if (f-exists? (f-join dir "default.nix"))
+          (cons 'transient dir)
+        (wpc-misc--briefcase-find (f-parent dir))))))
+
+(add-to-list 'project-find-functions #'wpc-misc--briefcase-find)
+
+(defun wpc-misc-pkill (name)
+  "Call the pkill executable using NAME as its argument."
+  (interactive "sProcess name: ")
+  (call-process "pkill" nil nil nil name))
+
+(use-package deadgrep
+  :config
+  (general-define-key
+   :keymaps 'deadgrep-mode-map
+   :states 'normal
+   "o" #'deadgrep-visit-result-other-window)
+  (setq-default deadgrep--context '(0 . 3))
+  (defun wpc-misc-deadgrep-region ()
+    "Run a ripgrep search on the active region."
+    (interactive)
+    (deadgrep (region-to-string)))
+  (defun wpc-misc-deadgrep-dwim ()
+    "If a region is active, use that as the search, otherwise don't."
+    (interactive)
+    (with-current-buffer (current-buffer)
+      (if (region-active-p)
+          (setq deadgrep--additional-flags '("--multiline"))
+          (wpc-misc-deadgrep-region)
+        (call-interactively #'deadgrep))))
+  (advice-add
+   'deadgrep--format-command
+   :filter-return
+   (lambda (cmd)
+     (replace-regexp-in-string
+      "^rg " "rg --hidden " cmd))))
+
+;; TODO: Do I need this when I have swiper?
+(use-package counsel)
+
+(use-package counsel-projectile)
+
+;; search Google, Stackoverflow from within Emacs
+(use-package engine-mode
+  :config
+  (defengine google
+    "http://www.google.com/search?ie=utf-8&oe=utf-8&q=%s"
+    :keybinding "g")
+  (defengine stack-overflow
+    "https://stackoverflow.com/search?q=%s"
+    :keybinding "s"))
+
+;; EGlot (another LSP client)
+(use-package eglot)
+
+;; Microsoft's Debug Adapter Protocol (DAP)
+(use-package dap-mode
+  :after lsp-mode
+  :config
+  (dap-mode 1)
+  (dap-ui-mode 1))
+
+;; Microsoft's Language Server Protocol (LSP)
+(use-package lsp-ui
+  :config
+  (add-hook 'lsp-mode-hook #'lsp-ui-mode))
+
+(use-package company-lsp
+  :config
+  (push 'company-lsp company-backends))
+
+;; Wilfred/suggest.el - Tool for discovering functions basesd on declaring your
+;; desired inputs and outputs.
+(use-package suggest)
+
+;; Malabarba/paradox - Enhances the `list-packages' view.
+(use-package paradox
+  :config
+  (paradox-enable))
+
+;; Start the Emacs server
+(when (not (server-running-p))
+  (server-start))
+
+(provide 'wpc-misc)
+;;; wpc-misc.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-nix.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-nix.el
new file mode 100644
index 000000000000..a555e4621a1f
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-nix.el
@@ -0,0 +1,72 @@
+;;; wpc-nix.el --- Nix support -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "25.1"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Configuration to support working with Nix.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'device)
+(require 'constants)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package nix-mode
+  :mode "\\.nix\\'")
+
+;; TODO(wpcarro): Ensure the sub-process can resolve <briefcase>.
+(defun wpc-nix-rebuild-emacs ()
+  "Use nix-env to rebuild wpcarros-emacs."
+  (interactive)
+  (let* ((pname (format "nix-build <briefcase/emacs.nixos>"))
+         (bname (format "*%s*" pname)))
+    (start-process pname bname
+                   "nix-env"
+                   "-I" (format "briefcase=%s" constants-briefcase)
+                   "-f" "<briefcase>" "-iA" "emacs.nixos")
+    (display-buffer bname)))
+
+(defun wpc-nix-sly-from-briefcase (attr)
+  "Start a Sly REPL configured using the derivation pointed at by ATTR.
+
+  The derivation invokes nix.buildLisp.sbclWith and is built asynchronously.
+  The build output is included in the error thrown on build failures."
+  (interactive "sAttribute: ")
+  (lexical-let* ((outbuf (get-buffer-create (format "*briefcase-out/%s*" attr)))
+         (errbuf (get-buffer-create (format "*briefcase-errors/%s*" attr)))
+         (expression (format "let briefcase = import <briefcase> {}; in briefcase.third_party.depot.nix.buildLisp.sbclWith [ briefcase.%s ]" attr))
+         (command (list "nix-build" "-E" expression)))
+    (message "Acquiring Lisp for <briefcase>.%s" attr)
+    (make-process :name (format "nix-build/%s" attr)
+                  :buffer outbuf
+                  :stderr errbuf
+                  :command command
+                  :sentinel
+                  (lambda (process event)
+                    (unwind-protect
+                        (pcase event
+                          ("finished\n"
+                           (let* ((outpath (s-trim (with-current-buffer outbuf
+                                                     (buffer-string))))
+                                  (lisp-path (s-concat outpath "/bin/sbcl")))
+                             (message "Acquired Lisp for <briefcase>.%s at %s"
+                                      attr lisp-path)
+                             (sly lisp-path)))
+                          (_ (with-current-buffer errbuf
+                               (error "Failed to build '%s':\n%s" attr
+                                      (buffer-string)))))
+                      (kill-buffer outbuf)
+                      (kill-buffer errbuf))))))
+
+(provide 'wpc-nix)
+;;; wpc-nix.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-org.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-org.el
new file mode 100644
index 000000000000..bed4dd067615
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-org.el
@@ -0,0 +1,40 @@
+;;; wpc-org.el --- My org preferences -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.1"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Hosts my org mode preferences
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'f)
+(require 'macros)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package org
+  :config
+  (evil-set-initial-state 'org-mode 'normal)
+  (general-add-hook 'org-mode-hook
+                    (list (macros-disable linum-mode)
+                          (macros-disable company-mode)))
+  (setq org-startup-folded nil)
+  (setq org-todo-keywords '((sequence "TODO" "BLOCKED" "DONE")))
+  (general-unbind 'normal org-mode-map "M-h" "M-j" "M-k" "M-l"))
+
+(use-package org-bullets
+  :config
+  (general-add-hook 'org-mode-hook (macros-enable org-bullets-mode)))
+
+(provide 'wpc-org)
+;;; wpc-org.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-package.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-package.el
new file mode 100644
index 000000000000..3a363df8ec9b
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-package.el
@@ -0,0 +1,33 @@
+;;; wpc-package.el --- My package configuration -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24.1"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; This module hosts all of the settings required to work with ELPA,
+;; MELPA, QUELPA, and co.
+
+;;; Code:
+
+(require 'package)
+
+;; Even though we're packaging our Emacs with Nix, having MELPA registered is
+;; helpful to ad-hoc test out packages before declaratively adding them to
+;; emacs/default.nix.
+(add-to-list 'package-archives '("melpa" . "http://melpa.org/packages/"))
+(package-initialize)
+
+(unless (package-installed-p 'use-package)
+  ;; TODO: Consider removing this to improve initialization speed.
+  (package-refresh-contents)
+  (package-install 'use-package))
+(eval-when-compile
+  (require 'use-package))
+;; TODO: Consider removing this, since I'm requiring general.el in individual
+;; modules.
+(use-package general)
+
+(provide 'wpc-package)
+;;; wpc-package.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-prolog.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-prolog.el
new file mode 100644
index 000000000000..b891a7df6912
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-prolog.el
@@ -0,0 +1,20 @@
+;;; wpc-prolog.el --- For Prologging things -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Code configuring my Prolog work.
+
+;;; Code:
+
+(require 'macros)
+
+;; TODO: Notice that the .pl extension conflicts with Perl files. This may
+;; become a problem should I start working with Perl.
+(macros-support-file-extension "pl" prolog-mode)
+
+(provide 'wpc-prolog)
+;;; wpc-prolog.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-python.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-python.el
new file mode 100644
index 000000000000..cd30f3ea3739
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-python.el
@@ -0,0 +1,25 @@
+;;; wpc-python.el --- Python configuration -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; My Python configuration settings
+;;
+;; Depends
+;; - `apti yapf`
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package py-yapf
+  :config
+  (add-hook 'python-mode-hook #'py-yapf-enable-on-save))
+
+(provide 'wpc-python)
+;;; wpc-python.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-rust.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-rust.el
new file mode 100644
index 000000000000..396d6349ae6a
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-rust.el
@@ -0,0 +1,48 @@
+;;; wpc-rust.el --- Support Rust language -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Supports my Rust work.
+;;
+;; Dependencies:
+;; - `rustup`
+;; - `rustup component add rust-src`
+;; - `rustup toolchain add nightly && cargo +nightly install racer`
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'macros)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package racer
+  :config
+  (setq rust-sysroot (->> "~/.cargo/bin/rustc --print sysroot"
+                          shell-command-to-string
+                          s-trim-right))
+  (setq racer-rust-src-path (f-join rust-sysroot "lib/rustlib/src/rust/src"))
+  (add-hook 'racer-mode-hook #'eldoc-mode))
+
+(use-package rust-mode
+  :config
+  (add-hook 'rust-mode-hook #'racer-mode)
+  (macros-add-hook-before-save 'rust-mode-hook #'rust-format-buffer)
+  (define-key rust-mode-map
+    (kbd "TAB")
+    #'company-indent-or-complete-common)
+  (define-key rust-mode-map
+    (kbd "M-d")
+    #'racer-describe))
+
+(provide 'wpc-rust)
+;;; wpc-rust.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-shell.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-shell.el
new file mode 100644
index 000000000000..855f234b281d
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-shell.el
@@ -0,0 +1,32 @@
+;;; wpc-shell.el --- POSIX Shell scripting support -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+;; Homepage: https://user.git.corp.google.com/wpcarro/briefcase
+
+;;; Commentary:
+;; Helpers for my shell scripting.  Includes bash, zsh, etc.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'zle)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Code
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(use-package flymake-shellcheck
+  :commands flymake-shellcheck-load
+  :init
+  (add-hook 'sh-mode-hook #'flymake-shellcheck-load)
+  (add-hook 'sh-mode-hook #'zle-minor-mode))
+
+(use-package fish-mode)
+
+(provide 'wpc-shell)
+;;; wpc-shell.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/wpc-ui.el b/users/wpcarro/emacs/.emacs.d/wpc/wpc-ui.el
new file mode 100644
index 000000000000..fd025ddd8fb3
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/wpc-ui.el
@@ -0,0 +1,181 @@
+;;; wpc-ui.el --- Any related to the UI/UX goes here -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Hosts font settings, scrolling, color schemes.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'constants)
+(require 'prelude)
+(require 'al)
+(require 'fonts)
+(require 'colorscheme)
+(require 'device)
+(require 'laptop-battery)
+(require 'modeline)
+(require 'general)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Configuration
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; line height
+(setq-default line-spacing 0)
+
+(when window-system
+  (setq frame-title-format '(buffer-file-name "%f" ("%b"))))
+
+;; Ensure that buffers update when their contents change on disk.
+(global-auto-revert-mode t)
+
+;; smooth scrolling settings
+(setq scroll-step 1
+      scroll-conservatively 10000)
+
+;; clean up modeline
+(use-package diminish
+  :config
+  (diminish 'emacs-lisp-mode "elisp")
+  (diminish 'evil-commentary-mode)
+  (diminish 'flycheck-mode)
+  (diminish 'auto-revert-mode)
+  (diminish 'which-key-mode)
+  (diminish 'yas-minor-mode)
+  (diminish 'lispyville-mode)
+  (diminish 'undo-tree-mode)
+  (diminish 'company-mode)
+  (diminish 'projectile-mode)
+  (diminish 'eldoc-mode)
+  ;; This is how to diminish `auto-fill-mode'.
+  (diminish 'auto-fill-function)
+  (diminish 'counsel-mode)
+  (diminish 'ivy-mode))
+
+;; TODO: Further customize `mode-line-format' variable.
+(delete 'mode-line-modes mode-line-format)
+(delete '(vc-mode vc-mode) mode-line-format)
+
+;; disable startup screen
+(setq inhibit-startup-screen t)
+
+;; disable toolbar
+(tool-bar-mode -1)
+
+;; set default buffer for Emacs
+(setq initial-buffer-choice constants-current-project)
+
+;; premium Emacs themes
+(use-package doom-themes
+  :config
+  (setq doom-themes-enable-bold t
+        doom-themes-enable-italic t)
+  (doom-themes-visual-bell-config)
+  (doom-themes-org-config))
+
+;; kbd discovery
+(use-package which-key
+  :config
+  (setq which-key-idle-delay 0.25)
+  (which-key-mode))
+
+;; completion framework
+(use-package ivy
+  :config
+  (counsel-mode t)
+  (ivy-mode t)
+  ;; Remove preceding "^" from ivy prompts
+  (setq ivy-initial-inputs-alist nil)
+  ;; prefer using `helpful' variants
+  (progn
+    (setq counsel-describe-function-function #'helpful-callable)
+    (setq counsel-describe-variable-function #'helpful-variable))
+  (general-define-key
+   :keymaps '(ivy-minibuffer-map ivy-switch-buffer-map)
+   ;; prev
+   "C-k" #'ivy-previous-line
+   "<backtab>" #'ivy-previous-line
+   ;; next
+   "C-j" #'ivy-next-line
+   "<tab>" #'ivy-next-line))
+
+(use-package ivy-prescient
+  :config
+  (ivy-prescient-mode 1)
+  (prescient-persist-mode 1))
+
+;; all-the-icons
+(use-package all-the-icons
+  :config
+  (when (not constants-ci?)
+    (unless (f-exists? "~/.local/share/fonts/all-the-icons.ttf")
+      (all-the-icons-install-fonts t))))
+
+;; icons for Ivy
+(use-package all-the-icons-ivy
+  :after (ivy all-the-icons)
+  :config
+  (all-the-icons-ivy-setup))
+
+;; disable menubar
+(menu-bar-mode -1)
+
+;; reduce noisiness of auto-revert-mode
+(setq auto-revert-verbose nil)
+
+;; highlight lines that are over `constants-fill-column' characters long
+(use-package whitespace
+  :config
+  ;; TODO: This should change depending on the language and project. For
+  ;; example, Google Java projects prefer 100 character width instead of 80
+  ;; character width.
+  (setq whitespace-line-column constants-fill-column)
+  (setq whitespace-style '(face lines-tail))
+  (add-hook 'prog-mode-hook #'whitespace-mode))
+
+;; dirname/filename instead of filename<dirname>
+(setq uniquify-buffer-name-style 'forward)
+
+;; highlight matching parens, brackets, etc
+(show-paren-mode 1)
+
+;; hide the scroll-bars in the GUI
+(scroll-bar-mode -1)
+
+;; TODO: Learn how to properly integrate this with dunst or another system-level
+;; notification program.
+;; GUI alerts in emacs
+(use-package alert
+  :commands (alert)
+  :config
+  (setq alert-default-style 'notifier))
+
+;; TODO: Should `device-work-laptop?' be a function or a constant that gets set
+;; during initialization?
+(when (device-work-laptop?)
+  (laptop-battery-display))
+
+(if window-system
+    (progn
+      (fonts-whitelist-set "JetBrainsMono")
+      (fonts-enable-ligatures)
+      (colorscheme-whitelist-set 'doom-solarized-light)
+      ;; the doom-acario-dark theme uses "Monospace Serif" as the font for
+      ;; comments, and I'd prefer JetBrainsMono (no italics).
+      (set-face-attribute font-lock-comment-face nil
+                          :family "JetBrainsMono"
+                          :slant 'normal))
+  (load-theme 'wombat))
+
+(modeline-setup)
+
+(provide 'wpc-ui)
+;;; wpc-ui.el ends here
diff --git a/users/wpcarro/emacs/.emacs.d/wpc/zle.el b/users/wpcarro/emacs/.emacs.d/wpc/zle.el
new file mode 100644
index 000000000000..0e0baad2d974
--- /dev/null
+++ b/users/wpcarro/emacs/.emacs.d/wpc/zle.el
@@ -0,0 +1,92 @@
+;;; zle.el --- Functions to mimmick my ZLE KBDs -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; URL: https://git.wpcarro.dev/wpcarro/briefcase
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; This is primarily for personal use.  The keybindings that I choose are those
+;; that feel slightly mnemonic while also not shadowing important bindings.
+;; It's quite possible that our tastes will differ here.
+;;
+;; All of these keybindings are intended to shave off milliseconds off your
+;; typing.  I don't expect these numbers to sum up to a meaningful amount.  The
+;; primary reason that I wrote this, is that it introduces a small amount of
+;; structural editing to my workflow.  I've been using these exact keybindings
+;; on the command line, and I find them subtely delightful to use.  So much so
+;; that I decided to bring them to my Emacs configuration.
+;;
+;; ZLE is the Z-shell line editor.  I have some KBDs and functions that I often
+;; want in Emacs.
+;;
+;; Usage:
+;; Consider running `(zle-minor-mode)' to run this globally.  Depending on your
+;; configuration, it could be non-disruptive, disruptive, or extremely
+;; disruptive.
+
+;;; Code:
+
+;; subshell (C-j)
+(defun zle-subshell ()
+  "Insert the characters necessary to create a subshell."
+  (interactive)
+  (insert-char ?$)
+  (insert-char ?\()
+  (save-excursion
+    (insert-char ?\))))
+
+;; variable (C-v)
+(defun zle-variable ()
+  "Insert the characters to reference a variable."
+  (interactive)
+  (insert-char ?$)
+  (insert-char ?{)
+  (save-excursion
+    (insert-char ?})))
+
+;; 2x dash (C-M--)
+(defun zle-dash-dash ()
+  "Insert the characters for flags with 2x dashes."
+  (interactive)
+  (insert-char ? )
+  (insert-char ?-)
+  (insert-char ?-))
+
+;; 1x quotes (M-')
+(defun zle-single-quote ()
+  "Insert the characters to quickly create single quotes."
+  (interactive)
+  (insert-char ? )
+  (insert-char ?')
+  (save-excursion
+    (insert-char ?')))
+
+;; 2x quotes (M-")
+(defun zle-double-quote ()
+  "Insert the characters to quickly create double quotes."
+  (interactive)
+  (insert-char ? )
+  (insert-char ?\")
+  (save-excursion
+    (insert-char ?\")))
+
+(defvar zle-kbds
+  (let ((map (make-sparse-keymap)))
+    (bind-keys :map map
+               ("C-j"   . zle-subshell)
+               ("C-v"   . zle-variable)
+               ("C-M--" . zle-dash-dash)
+               ("M-'"   . zle-single-quote)
+               ("M-\""  . zle-double-quote))
+    map)
+  "Keybindings shaving milliseconds off of typing.")
+
+(define-minor-mode zle-minor-mode
+  "A minor mode mirroring my ZLE keybindings."
+  :init-value nil
+  :lighter " zle"
+  :keymap zle-kbds)
+
+(provide 'zle)
+;;; zle.el ends here