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+;;; display.el --- Working with single or multiple displays -*- lexical-binding: t -*-
+;; Author: William Carroll <wpcarro@gmail.com>
+
+;;; Commentary:
+;; Mostly wrappers around xrandr.
+;;
+;; TODO: Look into autorandr to see if it could be useful.
+;;
+;; Troubleshooting:
+;; The following commands help me when I (infrequently) interact with xrandr.
+;; - xrandr --listmonitors
+;; - xrandr --query
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst display/install-kbds? t
+  "When t, install the keybindings defined in this module.")
+
+;; TODO: Consider if this logic should be conditioned by `device/work-laptop?'.
+(defconst display/laptop-monitor "eDP1"
+  "The xrandr identifier for my primary screen (on work laptop).")
+
+;; TODO: Why is HDMI-1, eDP-1 sometimes and HDMI1, eDP1 other times.
+(defconst display/4k-monitor "HDMI1"
+  "The xrandr identifer for my 4K monitor.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+;; TODO: Debug why something this scales to 4k appropriately and other times it
+;; doesn't.
+(defun display/enable-4k ()
+  "Attempt to connect to my 4K monitor."
+  (interactive)
+  (prelude/start-process
+   :name "display/enable-4k"
+   :command (string/format
+             "xrandr --output %s --above %s --primary --auto --dpi 144"
+             display/4k-monitor
+             display/laptop-monitor)))
+
+(defun display/disable-4k ()
+  "Disconnect from the 4K monitor."
+  (interactive)
+  (prelude/start-process
+   :name "display/disable-4k"
+   :command (string/format "xrandr --output %s --off"
+                           display/4k-monitor)))
+
+(defun display/enable-laptop ()
+  "Turn the laptop monitor off.
+Sometimes this is useful when I'm sharing my screen in a Google Hangout and I
+  only want to present one of my monitors."
+  (interactive)
+  (prelude/start-process
+   :name "display/disable-laptop"
+   :command (string/format "xrandr --output %s --auto"
+                           display/laptop-monitor)))
+
+(defun display/disable-laptop ()
+  "Turn the laptop monitor off.
+Sometimes this is useful when I'm sharing my screen in a Google Hangout and I
+  only want to present one of my monitors."
+  (interactive)
+  (prelude/start-process
+   :name "display/disable-laptop"
+   :command (string/format "xrandr --output %s --off"
+                           display/laptop-monitor)))
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Keybindings
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(when display/install-kbds?
+  (general-define-key
+   :prefix "<SPC>"
+   :states '(normal)
+   "d0" #'display/disable-laptop
+   "d1" #'display/enable-laptop)
+  (general-define-key
+   :prefix "<SPC>"
+   :states '(normal)
+   "D0" #'display/disable-4k
+   "D1" #'display/enable-4k))
+
+(provide 'display)
+;;; display.el ends here