Backlight fixes

defaults.lua

@@ -35,8 +35,13 @@ config.screenshot = { enabled = true }
 config.simple_widgets = { enabled = true }
 config.keymap_popup = { enabled = true }
 config.battery = { enabled = false }
-config.backlight = { enabled = false }
 config.picom = { enabled = true }
+config.backlight = {
+	enabled = false,
+	button_step = 5,
+	scroll_step = 5,
+	backend = "xbacklight"
+}
 
 config.core = {
 	-- Icon to use when a window doesn't provide one

modules/backlight/popup.lua

@@ -129,6 +129,10 @@ return function(s)
 	awesome.connect_signal("module::backlight:update",
 		function(value)
 
+			if value == nil then
+				value = 0
+			end
+
 			-- Update slider
 			widget.
 				container.

modules/backlight/util.lua

@@ -1,6 +1,69 @@
-local backlight = {}
+local brightnessctl = {}
+brightnessctl.parse = function(s)
+	local batpec = string.match(s, ",%d?%d?%d%%,")
+	batpec = batpec:sub(2, batpec:len() - 2)
+	return tonumber(batpec)
+end
 
-backlight.get = function(callback)
+brightnessctl.get = function(callback)
+	awful.spawn.easy_async(
+		"brightnessctl info -m",
+		function(stdout, stderr, exitreason, exitcode)
+			callback(brightnessctl.parse(stdout))
+		end
+	)
+end
+
+brightnessctl.set = function(value)
+	awful.spawn.easy_async(
+		"brightnessctl set " .. value .. "% -m",
+		function(stdout, stderr, exitreason, exitcode)
+			awesome.emit_signal(
+				"module::backlight:update",
+				brightnessctl.parse(stdout)
+			)
+		end
+	)
+end
+
+brightnessctl.watch = function(timeout, callback, widget)
+	awful.widget.watch(
+		"brightnessctl get -m",
+		timeout,
+		function(stdout, stderr, exitreason, exitcode)
+			callback(brightnessctl.parse(stdout))
+		end,
+		widget
+	)
+end
+
+brightnessctl.backlight_up = function(value)
+	awful.spawn.easy_async(
+		"brightnessctl set " .. value .. "%+ -m",
+		function(stdout, stderr, exitreason, exitcode)
+			awesome.emit_signal(
+				"module::backlight:update",
+				brightnessctl.parse(stdout)
+			)
+		end
+	)
+end
+
+brightnessctl.backlight_down = function(value)
+	awful.spawn.easy_async(
+		"brightnessctl set " .. value .. "%- -m",
+		function(stdout, stderr, exitreason, exitcode)
+			awesome.emit_signal(
+				"module::backlight:update",
+				brightnessctl.parse(stdout)
+			)
+		end
+	)
+end
+
+
+local xbacklight = {}
+xbacklight.get = function(callback)
 	awful.spawn.easy_async(
 		"xbacklight -get",
 		function(stdout, stderr, exitreason, exitcode)
@@ -9,11 +72,11 @@ backlight.get = function(callback)
 	)
 end
 
-backlight.set = function(value)
+xbacklight.set = function(value)
 	awful.spawn("xbacklight -set " .. value, false)
 end
 
-backlight.watch = function(timeout, callback, widget)
+xbacklight.watch = function(timeout, callback, widget)
 	awful.widget.watch(
 		"xbacklight -get",
 		timeout,
@@ -23,7 +86,7 @@ backlight.watch = function(timeout, callback, widget)
 end
 
 
-backlight.backlight_up = function(value)
+xbacklight.backlight_up = function(value)
 	awful.spawn.easy_async(
 		"xbacklight -inc " .. value,
 		function(stdout, stderr, exitreason, exitcode)
@@ -32,7 +95,7 @@ backlight.backlight_up = function(value)
 	)
 end
 
-backlight.backlight_down = function(value)
+xbacklight.backlight_down = function(value)
 	awful.spawn.easy_async(
 		"xbacklight -dec " .. value,
 		function(stdout, stderr, exitreason, exitcode)
@@ -41,6 +104,18 @@ backlight.backlight_down = function(value)
 	)
 end
 
+
+local backlight = {}
+if config.backlight.backend == "xbacklight" then
+	backlight = xbacklight
+elseif  config.backlight.backend == "brightnessctl" then
+	backlight = brightnessctl
+else
+	backlight = xbacklight
+end
+
+
+
 awesome.connect_signal("module::backlight:update_read",
 	function()
 		backlight.get(