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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."
(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))
;; 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
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