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+;;; keyboard.el --- Managing keyboard preferences with Elisp -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Setting key repeat and other values.
+;;
+;; Be wary of suspiciously round numbers.  Especially those divisible by ten!
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'string)
+(require 'number)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; 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.")
+
+(defcustom keyboard/install-kbds? nil
+  "When t, install keybindings.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; 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."
+   (shell-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)
+  (shell-command "xmodmap -e 'remove Lock = Caps_Lock'")
+  (shell-command "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))
+
+;; TODO: Define minor-mode for this.
+(when keyboard/install-kbds?
+  (general-unbind 'motion "C-i" "C-y")
+  (general-define-key
+   ;; TODO: Choose better KBDs for these that don't interfere with useful evil
+   ;; ones.
+   ;; Use C-y when you accidentally send the key-repeat too high or too low to
+   ;; be meaningful.
+   "C-y" #'keyboard/reset-key-repeat
+   "C-i" #'keyboard/inc-repeat-rate
+   "C-u" #'keyboard/dec-repeat-rate
+   "C-S-i" #'keyboard/inc-repeat-delay
+   "C-S-u" #'keyboard/dec-repeat-delay))
+
+(provide 'keyboard)
+;;; keyboard.el ends here