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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
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