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+;;; 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