Added spotify daemon and example spotify widget

Former-commit-id: c0cb2979b2
Former-commit-id: b49f80e039a49894ca2cd98679150fba4c091404
Former-commit-id: 785592b3bc72bebb2dad98c6f12ecaa514eaa206
Former-commit-id: 795b8b77c387b84fb24509fa97733a4b578df2d9

config/awesome/evil/init.lua

@@ -8,5 +8,6 @@ require("evil.ram")
 require("evil.weather")
 require("evil.mpd")
 require("evil.brightness")
+require("evil.spotify")
 
 -- return evil

config/awesome/evil/spotify.lua

@@ -0,0 +1,32 @@
+-- Provides:
+-- evil::spotify
+--      artist (string)
+--      song (string)
+--      status (string) [playing | paused | stopped]
+local awful = require("awful")
+
+local function emit_info(playerctl_output)
+    local artist = playerctl_output:match('artist_start(.*)title_start')
+    local title = playerctl_output:match('title_start(.*)status_start')
+    -- Use the lower case of status
+    local status = playerctl_output:match('status_start(.*)'):lower()
+    status = string.gsub(status, '^%s*(.-)%s*$', '%1')
+
+    awesome.emit_signal("evil::spotify", artist, title, status)
+end
+
+-- Sleeps until spotify changes state (pause/play/next/prev)
+local spotify_script = [[
+  sh -c '
+    playerctl metadata --format 'artist_start{{artist}}title_start{{title}}status_start{{status}}' --follow
+  ']]
+
+-- Kill old playerctl process
+awful.spawn.easy_async_with_shell("ps x | grep \"playerctl metadata\" | grep -v grep | awk '{print $1}' | xargs kill", function ()
+    -- Emit song info with each line printed
+    awful.spawn.with_line_callback(spotify_script, {
+        stdout = function(line)
+            emit_info(line)
+        end
+    })
+end)

config/awesome/noodle/spotify.lua

@@ -0,0 +1,42 @@
+local wibox = require("wibox")
+local awful = require("awful")
+local naughty = require("naughty")
+
+-- Declare widgets
+local spotify_artist = wibox.widget.textbox()
+local spotify_title = wibox.widget.textbox()
+
+-- Main widget that includes all others
+local spotify_widget = wibox.widget {
+    -- Title widget
+    {
+        align = "center",
+        text = "---",
+        font = "sans 14",
+        widget = spotify_title
+    },
+    -- Artist widget
+    {
+        align = "center",
+        text = "---",
+        font = "sans 10",
+        widget = spotify_artist
+    },
+    spacing = 2,
+    layout = wibox.layout.fixed.vertical
+}
+
+-- Subcribe to spotify updates
+awesome.connect_signal("evil::spotify", function(artist, title, status)
+    -- Do whatever you want with artist, title, status
+    -- ...
+    spotify_artist.text = artist
+    spotify_title.text = title
+
+    -- Example notification (might not be needed if spotify already sends one)
+    if status == "playing" then
+        naughty.notify({ title = "Spotify | Now Playing", message = title.." by "..artist })
+    end
+end)
+
+return spotify_widget