;;; display.el --- Working with single or multiple displays -*- lexical-binding: t -*-
;; Author: William Carroll <wpcarro@gmail.com>
;; Version: 0.0.1
;; URL: https://git.wpcarro.dev/wpcarro/briefcase
;; Package-Requires: ((emacs "24"))
;;; Commentary:
;; Mostly wrappers around xrandr.
;;
;; Troubleshooting:
;; The following commands help me when I (infrequently) interact with xrandr.
;; - xrandr --listmonitors
;; - xrandr --query
;;; Code:
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;; Dependencies
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(require 'prelude)
(require 'dash)
(require 's)
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;; Library
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(cl-defmacro display-register (name &key
output
primary
coords
size
rate
dpi
rotate)
"Macro to define constants and two functions for {en,dis}abling a display.
NAME - the human-readable identifier for the display
OUTPUT - the xrandr identifier for the display
PRIMARY - if true, send --primary flag to xrandr
COORDS - X and Y offsets
SIZE - the pixel resolution of the display (width height)
RATE - the refresh rate
DPI - the pixel density in dots per square inch
rotate - one of {normal,left,right,inverted}
See the man-page for xrandr for more details."
`(progn
(defconst ,(intern (format "display-%s" name)) ,output
,(format "The xrandr identifier for %s" name))
(defconst ,(intern (format "display-%s-args" name))
,(replace-regexp-in-string
"\s+" " "
(s-format "--output ${output} ${primary-flag} --auto \
--size ${size-x}x${size-y} --rate ${rate} --dpi ${dpi} \
--rotate ${rotate} ${pos-flag}"
#'aget
`(("output" . ,output)
("primary-flag" . ,(if primary "--primary" "--noprimary"))
("pos-flag" . ,(if coords
(format "--pos %dx%d"
(car coords)
(cadr coords))
""))
("size-x" . ,(car size))
("size-y" . ,(cadr size))
("rate" . ,rate)
("dpi" . ,dpi)
("rotate" . ,rotate))))
,(format "The arguments we pass to xrandr for display-%s." name))
(defconst ,(intern (format "display-%s-command" name))
(format "xrandr %s" ,(intern (format "display-%s-args" name)))
,(format "The command we run to configure %s" name))
(defun ,(intern (format "display-enable-%s" name)) ()
,(format "Attempt to enable my %s monitor" name)
(interactive)
(prelude-start-process
:name ,(format "display-enable-%s" name)
:command ,(intern (format "display-%s-command" name))))
(defun ,(intern (format "display-disable-%s" name)) ()
,(format "Attempt to disable my %s monitor." name)
(interactive)
(prelude-start-process
:name ,(format "display-disable-%s" name)
:command ,(format
"xrandr --output %s --off"
output)))))
(defmacro display-arrangement (name &key displays)
"Create a function, display-arrange-<NAME>, to enable all your DISPLAYS."
`(defun ,(intern (format "display-arrange-%s" name)) ()
(interactive)
(prelude-start-process
:name ,(format "display-configure-%s" name)
:command ,(format "xrandr %s"
(->> displays
(-map (lambda (x)
(eval (intern (format "display-%s-args" x)))))
(s-join " "))))))
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;; Configuration
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(display-register laptop
:output "eDP1"
:primary nil
:coords (2560 1440)
:size (1920 1080)
:rate 30.0
:dpi 144
:rotate normal)
(display-register 4k-horizontal
:output "DP2"
:primary t
:coords (0 0)
:size (2560 1440)
:rate 30.0
:dpi 144
:rotate normal)
(display-register 4k-vertical
:output "HDMI1"
:primary nil
:coords (-1440 -560)
:size (2560 1440)
:rate 30.0
:dpi 144
:rotate left)
(display-arrangement primary
:displays (laptop 4k-horizontal 4k-vertical))
(provide 'display)
;;; display.el ends here
