Add audio widget

audio.lua

@@ -0,0 +1,48 @@
+local vicious = require("vicious")
+local wibox = require("wibox")
+
+local icon_mute
+local icon_low
+local icon_medium
+local icon_high
+
+
+-- Create layout with widgets
+local widget = wibox.widget {
+   {
+      id = "icon",
+      widget = wibox.widget.imagebox,
+      resize = true
+   },
+   {
+      id = "text",
+      widget = wibox.widget.textbox,
+      resize = true
+   },
+   layout = wibox.layout.align.horizontal
+}
+vicious.register(widget.text, vicious.widgets.volume,
+    function (w, args)
+        if (args[2] ~= "🔈" ) then  -- this is emoji of "off", see https://github.com/vicious-widgets/vicious/blob/master/widgets/volume_linux.lua#L37
+            if args[1] >= 66 then
+                widget.icon:set_image(icon_high)
+            elseif args[1] >= 33 then
+                widget.icon:set_image(icon_medium)
+            else 
+                widget.icon:set_image(icon_low)
+            end
+        else
+            widget.icon:set_image(icon_mute)
+        end
+        return " " .. args[1] .. "%"
+    end, 1, "Master")
+
+-- Widget function that is available from the outside.
+function widget.set_icons(mute, low, medium, high)
+    icon_mute = mute
+    icon_low = low
+    icon_medium = medium
+    icon_high = high
+end
+
+return widget