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+;;; display.el --- Working with single or multiple displays -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; 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:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'dash)
+(require 's)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(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 " "))))))
+
+(provide 'display)
+;;; display.el ends here