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+;;; window-manager.el --- Functions augmenting my usage of EXWM -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; 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.
+
+;; Wist List:
+;; - TODO: Consider supporting MRU cache of worksapces.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'alert)
+(require 'cycle)
+(require 'dash)
+(require 'kbd)
+(require 's)
+(require 'exwm)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Variables
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defgroup window-manager nil
+  "Customization options for `window-manager'.")
+
+(cl-defstruct window-manager-named-workspace
+  label kbd display)
+
+(defcustom window-manager-named-workspaces nil
+  "List of `window-manager-named-workspace' structs."
+  :group 'window-manager
+  :type (list 'window-manager-named-workspace))
+
+(defcustom window-manager-screenlocker "xsecurelock"
+  "Reference to a screen-locking executable."
+  :group 'window-manager
+  :type 'string)
+
+(defvar window-manager--workspaces nil
+  "Cycle of the my EXWM workspaces.")
+
+(defconst window-manager--modes
+  (cycle-from-list (list #'window-manager--char-mode
+                         #'window-manager--line-mode))
+  "Functions to switch exwm modes.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun window-manager--alert (x)
+  "Message X with a structured format."
+  (alert (s-concat "[exwm] " x)))
+
+(cl-defun window-manager-init (&key init-hook)
+  "Call `exwm-enable' alongside other bootstrapping functions."
+  (require 'exwm-config)
+  (require 'exwm-randr)
+  (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 (length window-manager-named-workspaces))
+  (setq exwm-input-simulation-keys
+        '(([?\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])
+          ([?\C-c] . [C-c])))
+  ;; Install workspace KBDs
+  (progn
+    (->> window-manager-named-workspaces
+         (list-map #'window-manager--register-kbd))
+    (window-manager--alert "Registered workspace KBDs!"))
+  ;; Ensure exwm apps open in char-mode.
+  (add-hook 'exwm-manage-finish-hook #'window-manager--char-mode)
+  (add-hook 'exwm-init-hook init-hook)
+  (setq window-manager--workspaces
+        (cycle-from-list window-manager-named-workspaces))
+  (exwm-randr-enable)
+  (exwm-enable))
+
+(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)))
+
+;; 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"))
+
+(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)))))
+
+(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
+   (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)))
+
+(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))))
+
+(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-workspace-move ()
+  "Prompt the user to move the current workspace to another."
+  (interactive)
+  (exwm-workspace-move
+   exwm-workspace--current
+   (window-manager--label->index
+    (completing-read "Move current workspace to: "
+                     (->> window-manager-named-workspaces
+                          (-map #'window-manager-named-workspace-label))
+                     nil
+                     t)
+    window-manager-named-workspaces)))
+
+(defun window-manager-move-window ()
+  "Prompt the user to move the current window to another workspace."
+  (interactive)
+  (let ((window (get-buffer-window))
+        (dest (completing-read "Move current window to: "
+                               (->> window-manager-named-workspaces
+                                    (-map #'window-manager-named-workspace-label))
+                               nil
+                               t)))
+    (exwm-workspace-move-window
+     (exwm-workspace--workspace-from-frame-or-index
+      (window-manager--label->index dest window-manager-named-workspaces))
+     (exwm--buffer->id window))
+    (window-manager--switch dest)))
+
+(provide 'window-manager)
+;;; window-manager.el ends here