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+;;; pulse-audio.el --- Control audio with Elisp -*- lexical-binding: t -*-
+
+;; Author: William Carroll <wpcarro@gmail.com>
+;; Version: 0.0.1
+;; Package-Requires: ((emacs "24"))
+
+;;; Commentary:
+;; Because everything in my configuration is turning into Elisp these days.
+
+;;; Code:
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Dependencies
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(require 'prelude)
+(require 'string)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Constants
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defconst pulse-audio--step-size 5
+  "The size by which to increase or decrease the volume.")
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+;; Library
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defun pulse-audio--message (x)
+  "Output X to *Messages*."
+  (message (string-format "[pulse-audio.el] %s" x)))
+
+(defun pulse-audio-toggle-mute ()
+  "Mute the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-toggle-mute"
+   :command "pactl set-sink-mute @DEFAULT_SINK@ toggle")
+  (pulse-audio--message "Mute toggled."))
+
+(defun pulse-audio-toggle-microphone ()
+  "Mute the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-toggle-microphone"
+   :command "pactl set-source-mute @DEFAULT_SOURCE@ toggle")
+  (pulse-audio--message "Microphone toggled."))
+
+(defun pulse-audio-decrease-volume ()
+  "Low the volume output of the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-decrease-volume"
+   :command (string-format "pactl set-sink-volume @DEFAULT_SINK@ -%s%%"
+                           pulse-audio--step-size))
+  (pulse-audio--message "Volume decreased."))
+
+(defun pulse-audio-increase-volume ()
+  "Raise the volume output of the default sink."
+  (interactive)
+  (prelude-start-process
+   :name "pulse-audio-increase-volume"
+   :command (string-format "pactl set-sink-volume @DEFAULT_SINK@ +%s%%"
+                           pulse-audio--step-size))
+  (pulse-audio--message "Volume increased."))
+
+(provide 'pulse-audio)
+;;; pulse-audio.el ends here