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+(require 'chart)
+(require 'dash)
+(require 'map)
+
+(defun load-file-if-exists (filename)
+  (if (file-exists-p filename)
+      (load filename)))
+
+(defun goto-line-with-feedback ()
+  "Show line numbers temporarily, while prompting for the line number input"
+  (interactive)
+  (unwind-protect
+      (progn
+        (setq-local display-line-numbers t)
+        (let ((target (read-number "Goto line: ")))
+          (avy-push-mark)
+          (goto-line target)))
+    (setq-local display-line-numbers nil)))
+
+;; These come from the emacs starter kit
+
+(defun esk-add-watchwords ()
+  (font-lock-add-keywords
+   nil '(("\\<\\(FIX\\(ME\\)?\\|TODO\\|DEBUG\\|HACK\\|REFACTOR\\|NOCOMMIT\\)"
+          1 font-lock-warning-face t))))
+
+(defun esk-sudo-edit (&optional arg)
+  (interactive "p")
+  (if (or arg (not buffer-file-name))
+      (find-file (concat "/sudo:root@localhost:" (read-file-name "File: ")))
+    (find-alternate-file (concat "/sudo:root@localhost:" buffer-file-name))))
+
+;; Open the NixOS man page
+(defun nixos-man ()
+  (interactive)
+  (man "configuration.nix"))
+
+;; Get the nix store path for a given derivation.
+;; If the derivation has not been built before, this will trigger a build.
+(defun nix-store-path (derivation)
+  (let ((expr (concat "with import <nixos> {}; " derivation)))
+    (s-chomp (shell-command-to-string (concat "nix-build -E '" expr "'")))))
+
+(defun insert-nix-store-path ()
+  (interactive)
+  (let ((derivation (read-string "Derivation name (in <nixos>): ")))
+    (insert (nix-store-path derivation))))
+
+(defun toggle-force-newline ()
+  "Buffer-local toggle for enforcing final newline on save."
+  (interactive)
+  (setq-local require-final-newline (not require-final-newline))
+  (message "require-final-newline in buffer %s is now %s"
+           (buffer-name)
+           require-final-newline))
+
+(defun list-external-commands ()
+  "Creates a list of all external commands available on $PATH
+  while filtering NixOS wrappers."
+  (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)))
+
+(defvar external-command-flag-overrides
+  '(("google-chrome" . "--force-device-scale-factor=1.4"))
+
+  "This setting lets me add additional flags to specific commands
+  that are run interactively via `run-external-command'.")
+
+(defun run-external-command--handler (cmd)
+  "Execute the specified command and notify the user when it
+  finishes."
+    (let* ((extra-flags (cdr (assoc cmd external-command-flag-overrides)))
+           (cmd (if extra-flags (s-join " " (list cmd extra-flags)) cmd)))
+      (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 run-external-command ()
+  "Prompts the user with a list of all installed applications and
+  lets them select one to launch."
+
+  (interactive)
+  (let ((external-commands-list (list-external-commands)))
+    (run-external-command--handler
+     (completing-read "Command: " external-commands-list
+                      nil                             ;; predicate
+                      t                               ;; require-match
+                      nil                             ;; initial-input
+                      ;; hist
+                      'external-commands-history))))
+
+(defun password-store-lookup (&optional password-store-dir)
+  "Interactive password-store lookup function that actually uses
+the GPG agent correctly."
+
+  (interactive)
+
+  (let* ((entry (completing-read "Copy password of entry: "
+                   (password-store-list (or password-store-dir
+                                            (password-store-dir)))
+                   nil ;; predicate
+                   t   ;; require-match
+                   ))
+         (password (auth-source-pass-get 'secret entry)))
+    (password-store-clear)
+    (kill-new password)
+    (setq password-store-kill-ring-pointer kill-ring-yank-pointer)
+    (message "Copied %s to the kill ring. Will clear in %s seconds."
+             entry (password-store-timeout))
+    (setq password-store-timeout-timer
+          (run-at-time (password-store-timeout)
+                       nil 'password-store-clear))))
+
+(defun browse-repositories ()
+  "Select a git repository and open its associated magit buffer."
+
+  (interactive)
+  (magit-status
+   (completing-read "Repository: " (magit-list-repos))))
+
+(defun bottom-right-window-p ()
+  "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))))
+
+(defhydra mc/mark-more-hydra (:color pink)
+  ("<up>" mmlte--up "Mark previous like this")
+  ("<down>" mc/mmlte--down "Mark next like this")
+  ("<left>" mc/mmlte--left (if (eq mc/mark-more-like-this-extended-direction 'up)
+                               "Skip past the cursor furthest up"
+                             "Remove the cursor furthest down"))
+  ("<right>" mc/mmlte--right (if (eq mc/mark-more-like-this-extended-direction 'up)
+                                 "Remove the cursor furthest up"
+                               "Skip past the cursor furthest down"))
+  ("f" nil "Finish selecting"))
+
+;; Mute the message that mc/mmlte wants to print on its own
+(advice-add 'mc/mmlte--message :around (lambda (&rest args) (ignore)))
+
+(defun mc/mark-dwim (arg)
+  "Select multiple things, but do what I mean."
+
+  (interactive "p")
+  (if (not (region-active-p)) (mc/mark-next-lines arg)
+    (if (< 1 (count-lines (region-beginning)
+                          (region-end)))
+        (mc/edit-lines arg)
+      ;; The following is almost identical to `mc/mark-more-like-this-extended',
+      ;; but uses a hydra (`mc/mark-more-hydra') instead of a transient key map.
+      (mc/mmlte--down)
+      (mc/mark-more-hydra/body))))
+
+(defun memespace-region ()
+  "Make a meme out of it."
+
+  (interactive)
+  (let* ((start (region-beginning))
+         (end (region-end))
+         (memed
+          (message
+           (s-trim-right
+            (apply #'string
+                   (-flatten
+                    (nreverse
+                     (-reduce-from (lambda (acc x)
+                                     (cons (cons x (-repeat (+ 1 (length acc)) 32)) acc))
+                                   '()
+                                   (string-to-list (buffer-substring-no-properties start end))))))))))
+
+    (save-excursion (delete-region start end)
+                    (goto-char start)
+                    (insert memed))))
+
+(defun insert-todo-comment (prefix todo)
+  "Insert a comment at point with something for me to do."
+
+  (interactive "P\nsWhat needs doing? ")
+  (save-excursion
+    (move-end-of-line nil)
+    (insert (format " %s TODO(%s): %s"
+                    (s-trim-right comment-start)
+                    (if prefix (read-string "Who needs to do this? ")
+                      (getenv "USER"))
+                    todo))))
+
+;; Custom text scale adjustment functions that operate on the entire instance
+(defun modify-text-scale (factor)
+  (set-face-attribute 'default nil
+                      :height (+ (* factor 5) (face-attribute 'default :height))))
+
+(defun increase-default-text-scale (prefix)
+  "Increase default text scale in all Emacs frames, or just the
+  current frame if PREFIX is set."
+
+  (interactive "P")
+  (if prefix (text-scale-increase 1)
+    (modify-text-scale 1)))
+
+(defun decrease-default-text-scale (prefix)
+  "Increase default text scale in all Emacs frames, or just the
+  current frame if PREFIX is set."
+
+  (interactive "P")
+  (if prefix (text-scale-decrease 1)
+    (modify-text-scale -1)))
+
+(defun set-default-text-scale (prefix &optional to)
+  "Set the default text scale to the specified value, or the
+  default. Restores current frame's text scale only, if PREFIX is
+  set."
+
+  (interactive "P")
+  (if prefix (text-scale-adjust 0)
+    (set-face-attribute 'default nil :height (or to 120))))
+
+(defun scrot-select ()
+  "Take a screenshot based on a mouse-selection and save it to
+  ~/screenshots."
+  (interactive)
+  (shell-command "scrot '$a_%Y-%m-%d_%s.png' -s -e 'mv $f ~/screenshots/'"))
+
+(defun graph-unread-mails ()
+  "Create a bar chart of unread mails based on notmuch tags.
+  Certain tags are excluded from the overview."
+
+  (interactive)
+  (let ((tag-counts
+         (-keep (-lambda ((name . search))
+                  (let ((count
+                         (string-to-number
+                          (s-trim
+                           (notmuch-command-to-string "count" search "and" "tag:unread")))))
+                    (when (>= count 1) (cons name count))))
+                (notmuch-hello-generate-tag-alist '("unread" "signed" "attachment" "important")))))
+
+    (chart-bar-quickie
+     (if (< (length tag-counts) 6)
+         'vertical 'horizontal)
+     "Unread emails"
+     (-map #'car tag-counts) "Tag:"
+     (-map #'cdr tag-counts) "Count:")))
+
+(defun notmuch-show-open-or-close-subthread (&optional prefix)
+  "Open or close the subthread from (and including) the message at point."
+  (interactive "P")
+  (save-excursion
+    (let ((current-depth (map-elt (notmuch-show-get-message-properties) :depth 0)))
+      (loop do (notmuch-show-message-visible (notmuch-show-get-message-properties) prefix)
+            until (or (not (notmuch-show-goto-message-next))
+                      (= (map-elt (notmuch-show-get-message-properties) :depth) current-depth)))))
+  (force-window-update))
+
+(defun vterm-send-ctrl-x ()
+  "Sends `C-x' to the libvterm."
+  (interactive)
+  (vterm-send-key "x" nil nil t))
+
+(defun find-depot-project (dir)
+  "Function used in the `project-find-functions' hook list to
+  determine the current project root of a depot project."
+  (when (s-starts-with? "/depot" dir)
+    (if (f-exists-p (f-join dir "default.nix"))
+        (cons 'transient dir)
+      (find-depot-project (f-parent dir)))))
+
+(add-to-list 'project-find-functions #'find-depot-project)
+
+(defun magit-find-file-worktree ()
+  (interactive)
+  "Find a file in the current (ma)git worktree."
+  (magit-find-file--internal "{worktree}"
+                             (magit-read-file-from-rev "HEAD" "Find file")
+                             #'pop-to-buffer-same-window))
+
+(defun songwhip--handle-result (status &optional cbargs)
+  ;; TODO(tazjin): Inspect status, which looks different in practice
+  ;; than the manual claims.
+  (if-let* ((response (json-parse-string
+                       (buffer-substring url-http-end-of-headers (point-max))))
+            (sw-path (ht-get* response "data" "path"))
+            (link (format "https://songwhip.com/%s" sw-path))
+            (select-enable-clipboard t))
+      (progn
+        (kill-new link)
+        (message "Copied Songwhip link (%s)" link))
+    (warn "Something went wrong while retrieving Songwhip link!")
+    ;; For debug purposes, the buffer is persisted in this case.
+    (setq songwhip--debug-buffer (current-buffer))))
+
+(defun songwhip-lookup-url (url)
+  "Look up URL on Songwhip and copy the resulting link to the clipboard."
+  (interactive "sEnter source URL: ")
+  (let ((songwhip-url "https://songwhip.com/api/")
+        (url-request-method "POST")
+        (url-request-extra-headers '(("Content-Type" . "application/json")))
+        (url-request-data
+         (json-serialize `((country . "GB")
+                           (url . ,url)))))
+    (url-retrieve "https://songwhip.com/api/" #'songwhip--handle-result nil t t)
+    (message "Requesting Songwhip URL ... please hold the line.")))
+
+(defun rg-in-project (&optional prefix)
+  "Interactively call ripgrep in the current project, or fall
+  back to ripgrep default behaviour if prefix is set."
+  (interactive "P")
+  (counsel-rg nil (unless prefix
+                    (if-let ((pr (project-current)))
+                        (project-root pr)))))
+
+(provide 'functions)