tvl-depot/configs/shared/.emacs.d/wpc/screen-brightness.el
William Carroll 5785a5d126 Support prelude/start-process
If you refer to the previous commit where I change shell-command usages to
start-process function calls, you'll see the rationale for why I prefer
start-process.

This commit introduces a more ergonomic API for start-process that fits most of
my current use-cases of it. This cleans up the code. I have introduced a bug in
the way that I'm tokenizing the COMMAND value. I've tracked that with a
TODO. For now it only affects the `xmodmap -e '<command-string>'` calls, which
isn't too disruptive.
2020-01-06 15:25:25 +00:00

54 lines
1.9 KiB
EmacsLisp

;;; screen-brightness.el --- Control laptop screen brightness -*- lexical-binding: t -*-
;; Author: William Carroll <wpcarro@gmail.com>
;;; Commentary:
;; Mainly just Elisp wrappers around `xbacklight`.
;;; Code:
;; TODO: Define some isomorphisms. E.g. int->string, string->int.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Dependencies
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(require 'prelude)
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Constants
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defconst screen-brightness/step-size 15
"The size of the increment or decrement step for the screen's brightness.")
(defcustom screen-brightness/install-kbds? t
"If t, install the keybindings to control screen brightness.")
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;; Library
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
(defun screen-brightness/increase ()
"Increase the screen brightness."
(interactive)
(prelude/start-process
:name "screen-brightness/increase"
:command (string/format "xbacklight -inc %s" screen-brightness/step-size))
(message "[screen-brightness.el] Increased screen brightness."))
(defun screen-brightness/decrease ()
"Decrease the screen brightness."
(interactive)
(prelude/start-process
:name "screen-brightness/decrease"
:command (string/format "xbacklight -dec %s" screen-brightness/step-size))
(message "[screen-brightness.el] Decreased screen brightness."))
(when screen-brightness/install-kbds?
(exwm-input-set-key
(kbd "<XF86MonBrightnessUp>") #'screen-brightness/increase)
(exwm-input-set-key
(kbd "<XF86MonBrightnessDown>") #'screen-brightness/decrease))
(provide 'screen-brightness)
;;; screen-brightness.el ends here