simple-awesome/simple/media_control.lua

--
-- Control playing music/media and sound volume
-- Currently supports :
-- - playerctl
-- - Spotify
--

--
-- DEBUG
--
local inspect = require("simple/debug/inspect")

local awful = require("awful")
local beautiful = require("beautiful")
local gears = require("gears")
local naughty = require("naughty")
local wibox = require("wibox")

local hotkey = require("simple/core/hotkey")

local config = require("config")

local hasPlayerctl = os.execute("playerctl -v") == true

-- playerctl
function sendToPlayerctl(command, callback)
	callback = callback or function()
	end
	awful.spawn.easy_async("playerctl " .. command, callback)
end

-- Spotify
function sendToSpotify(command, callback)
	callback = callback or function()
	end
	awful.spawn.easy_async_with_shell("dbus-send --print-reply --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player." .. command, callback)
end

-- Brightness control
function getBrightness(callback)
	callback = callback or function()
	end

	awful.spawn.easy_async("xbacklight -get", function(stdout, stderr, reason, exit_code)
		callback(stdout)
	end)
end

function increaseBrightness(callback)
	callback = callback or function()
	end
	awful.spawn.easy_async("xbacklight -inc 2", callback)
end

function decreaseBrightness(callback)
	callback = callback or function()
	end
	awful.spawn.easy_async("xbacklight -dec 2", callback)
end


-- Volume control
function isMuted(callback)
	awful.spawn.easy_async_with_shell("amixer " .. config.audio.card .. " sget '" .. config.audio.device .. "' | egrep 'Playback.*?\\[o' | egrep -o '\\[o.+\\]'", function(stdout, stderr, reason, exit_code)
		callback(string.match(string.gsub(stdout, "[\n]+", ""), "off"))
	end)
end

function getVolume(callback)
	awful.spawn.easy_async_with_shell("amixer " .. config.audio.card .. " sget '" .. config.audio.device .. "' -M | awk -F\"[][]\" '/%/ { print $2 }' | head -n 1", function(stdout, stderr, reason, exit_code)
		callback(string.gsub(stdout, "[\n%%]+", "") / 100)
	end)
end

function getVolumeImage(volume)
	local path = beautiful.volume_osd_icon_3
	if volume < 0.667 then
		path = beautiful.volume_osd_icon_2
	end
	if volume < 0.334 then
		path = beautiful.volume_osd_icon_1
	end
	if volume <= 0 then
		path = beautiful.volume_osd_icon_0
	end
	return gears.color.recolor_image(path, beautiful.volume_osd_image_color)
end

local volumeWibox = wibox({
	ontop = true,
	bg = beautiful.volume_osd_bg,
	border_width = beautiful.volume_osd_border_width,
	border_color = beautiful.volume_osd_border_color,
	shape = beautiful.volume_osd_shape,
	width = beautiful.volume_osd_width,
	height = beautiful.volume_osd_bar_height + beautiful.volume_osd_padding * 3,
	widget = wibox.widget {
		{
			{
				image = getVolumeImage(1),
				widget = wibox.widget.imagebox
			},
			left = beautiful.volume_osd_padding,
			right = beautiful.volume_osd_padding,
			top = beautiful.volume_osd_padding,
			bottom = 0,
			widget = wibox.container.margin,
		},
		{
			{
				{
					max_value = 1,
					value = 0.33,
					shape = gears.shape.rounded_bar,
					bar_shape = gears.shape.rounded_bar,
					margins = beautiful.volume_osd_padding + 4,
					color = beautiful.volume_osd_progress_color,
					background_color = beautiful.volume_osd_progress_bg,
					border_color = beautiful.volume_osd_progress_border_color,
					border_width = beautiful.volume_osd_progress_border_width,
					widget = wibox.widget.progressbar
				},
				forced_width = 80,
				forced_height = 80,
				direction = "east",
				layout = wibox.container.rotate,
			},
			left = beautiful.volume_osd_padding,
			right = beautiful.volume_osd_padding,
			top = 0,
			bottom = beautiful.volume_osd_padding,
			widget = wibox.container.margin,
		},
		layout = wibox.layout.align.vertical
	},
})

local imagebox = volumeWibox.widget:get_children()[1]:get_children()[1]
local progressbar = volumeWibox.widget:get_children()[2]:get_children()[1]:get_children()[1]

local timer = nil

-- {{{ Control
local playPause = function()
	if hasPlayerctl then
		sendToPlayerctl("play-pause")
	else
		sendToSpotify("PlayPause")
	end
end

local nextTrack = function()
	if hasPlayerctl then
		sendToPlayerctl("next")
	else
		sendToSpotify("Next")
	end
end

local previousTrack = function()
	if hasPlayerctl then
		sendToPlayerctl("previous")
	else
		sendToSpotify("Previous")
	end
end

local displayVolume = function()
	isMuted(function(muted)
		getVolume(function(volume)
			-- Update values
			imagebox.image = getVolumeImage(muted and 0 or volume)
			progressbar.value = volume
			progressbar.color = muted and beautiful.volume_osd_progress_color_muted or beautiful.volume_osd_progress_color

			if timer ~= nil and timer.started then
				timer:again()
				return
			end

			-- Update screen
			local screen = awful.screen:focused()
			volumeWibox.screen = screen

			-- Position
			local position = beautiful.volume_osd_position(screen.geometry.width, screen.geometry.height, beautiful.volume_osd_width, beautiful.volume_osd_height)
			volumeWibox:geometry({
				x = (screen.geometry.x + position[1]),
				y = (screen.geometry.y + position[2])
			})

			-- Show
			volumeWibox.visible = true

			-- Schedule hide
			if timer ~= nil then
				timer:stop()
			end
			timer = gears.timer {
				timeout = config.volume_osd_timeout,
				callback = function()
					volumeWibox.visible = false
					timer:stop()
					timer = nil
				end
			}
			timer:start()
		end)
	end)
end
local raiseVolume = function()
	awful.spawn.easy_async("amixer " .. config.audio.card .. " set '" .. config.audio.device .. "' 5%+ -M", function(stdout, stderr, reason, exit_code)
		displayVolume()
	end)
end
local lowerVolume = function()
	awful.spawn.easy_async("amixer " .. config.audio.card .. " set '" .. config.audio.device .. "' 5%- -M", function(stdout, stderr, reason, exit_code)
		displayVolume()
	end)
end
local toggleMute = function()
	isMuted(function(muted)
		awful.spawn.easy_async("amixer " .. config.audio.card .. " set '" .. config.audio.device .. "' " .. (muted and 'on' or 'off'), function(stdout, stderr, reason, exit_code)
			displayVolume()
		end)
	end)
end
-- }}}

function getKeys(keys)
	if config.audio.card == 'disabled' then
		return
		-- Media control
		hotkey.make(keys.playPause, playPause,
				{ description = "Toggle Play / Pause", group = "media control" }),
		hotkey.make(keys.nextTrack, nextTrack,
				{ description = "Next track", group = "media control" }),
		hotkey.make(keys.previousTrack, previousTrack,
				{ description = "Previous track", group = "media control" })
	end

	return
	-- Volume control
	hotkey.make(keys.raiseVolume, raiseVolume,
			{ description = "Raise volume", group = "media control" }),
	hotkey.make(keys.lowerVolume, lowerVolume,
			{ description = "Lower volume", group = "media control" }),
	hotkey.make(keys.toggleMute, toggleMute,
			{ description = "Toggle mute audio", group = "media control" }),

	-- Media control
	hotkey.make(keys.playPause, playPause,
			{ description = "Toggle Play / Pause", group = "media control" }),
	hotkey.make(keys.nextTrack, nextTrack,
			{ description = "Next track", group = "media control" }),
	hotkey.make(keys.previousTrack, previousTrack,
			{ description = "Previous track", group = "media control" }),

	-- Backlight control
	hotkey.make(keys.brightnessUp, increaseBrightness,
			{ description = "Increase screen backlight brightness", group = "media control" }),
	hotkey.make(keys.brightnessDown, decreaseBrightness,
			{ description = "Decrease screen backlight brightness", group = "media control" })
end

return {
	getKeys = getKeys,
}