Add sound control widget to awesome.

awesome/.config/awesome/rc.lua

@@ -10,6 +10,7 @@ local beautiful = require("beautiful")
 -- Notification library
 local naughty = require("naughty")
 local menubar = require("menubar")
+local volume = require("volume")
 
 -- {{{ Error handling
 -- Check if awesome encountered an error during startup and fell back to
@@ -191,6 +192,7 @@ for s = 1, screen.count() do
 	local battery = require("battery")
 
     right_layout:add(mytextclock)
+	right_layout:add(volume)
 	right_layout:add(battery)
     right_layout:add(mylayoutbox[s])
 
@@ -276,6 +278,11 @@ globalkeys = awful.util.table.join(
     -- Menubar
 	awful.key({ modkey }, "p", function() menubar.show() end),
 
+	-- Volume control
+	awful.key({ }, "XF86AudioLowerVolume", function () volume.decrease() end),
+	awful.key({ }, "XF86AudioRaiseVolume", function () volume.increase() end),
+	awful.key({ }, "XF86AudioMute", function () volume.mute() end),
+
 	-- Backlight control
 	awful.key({ }, "XF86MonBrightnessDown", function ()
 		awful.util.spawn("xbacklight -dec 15") end),

awesome/.config/awesome/volume.lua

@@ -0,0 +1,50 @@
+-- Volume widget
+
+local vicious = require("vicious")
+local wibox = require("wibox")
+local awful = require("awful")
+
+module("volume")
+
+local widget = wibox.widget.textbox()
+
+local function volume_callback (_, args)
+	local muted = args[2]
+	local volume = args[1]
+
+	if muted == "♫" then
+		return "🔊" .. volume .. "%"
+	else
+		return "🔇"
+	end
+end
+
+local function volume_command (command)
+	local step = "5%"
+	local base = "amixer set Master "
+
+	if command == "mute" then
+		awful.util.spawn(base .. "toggle")
+	else
+		awful.util.spawn(base .. step .. command)
+	end
+
+	vicious.force({widget})
+end
+
+
+widget.increase = function()
+	volume_command("+")
+end
+
+widget.decrease = function()
+	volume_command("-")
+end
+
+widget.mute = function()
+	volume_command("mute")
+end
+
+vicious.register(widget, vicious.widgets.volume, volume_callback, 60, "Master")
+
+return widget