Add display backlight control notification

displaybacklight.lua

@@ -0,0 +1,67 @@
+-- requires xorg-xbacklight installed
+
+local awful = require("awful")
+local vicious = require("vicious")
+local wibox = require("wibox")
+local naughty = require("naughty")
+local beautiful = require("beautiful")
+
+local icon_brightness
+local brightness_id
+
+
+-- Create layout with widgets
+local widget = wibox.widget {
+   {
+      id = "icon",
+      widget = wibox.widget.imagebox,
+      resize = true
+   },
+   layout = wibox.layout.align.horizontal
+}
+
+local function change_brightness(amount)
+    if (amount < 0) then
+        awful.util.spawn("xbacklight -dec " .. math.abs(amount))
+    else
+        awful.util.spawn("xbacklight -inc " .. math.abs(amount))
+    end
+    local f = io.popen("xbacklight -get")
+    local bright = 0
+    for line in f:lines() do
+        bright = line
+    end
+    -- add changed amount as the current value is not yet changed when calling io.popen
+    return tonumber(bright) + amount
+end
+
+-- Widget functions that are available from the outside.
+function widget.set_icons(brightness)
+    icon_brightness = brightness
+end
+
+function widget.notify_brightness(delta)
+    local brightness = change_brightness(delta)
+    notify_icon = icon_brightness
+    local notify_icon_bright = naughty.notify({
+            position = "top_middle",
+            border_width = 0,
+            icon = notify_icon,
+            replaces_id = brightness_id })
+    brightness_id = notify_icon_bright.id
+    local notify_width = notify_icon_bright.width
+    local bar = wibox.widget.progressbar()
+    bar:set_value(brightness)
+    bar:set_max_value(100)
+    bar:set_color(beautiful.archcolor)
+    bar:set_background_color(beautiful.archcolor_bg)
+    wibox.widget.draw_to_svg_file(bar, "/tmp/bright-bar.svg", 128, 10)
+    brightness_id_1 = naughty.notify({
+            position = "top_middle",
+            border_width = 0,
+            icon = "/tmp/bright-bar.svg",
+            width = notify_width,
+            replaces_id = brightness_id_1 }).id
+end
+
+return widget