Polybar: Add spotify status script, adjust default bar size

Thanks Jvanrhijn for the script

.config/polybar/config

@@ -19,6 +19,7 @@ icon-date = ${res/colors.primary}
 icon-dropbox = ${res/colors.primary}
 icon-fs = ${xrdb:color11}
 icon-memory = ${xrdb:color13}
+icon-spotify = ${xrdb:color2}
 icon-tor = ${xrdb:color13}
 icon-volume = ${res/colors.primary}
 icon-network = ${xrdb:color14}
@@ -35,7 +36,7 @@ bar-empty = ${self.border}
 
 [res/config]
 padding = 4
-bar-width = ${env:PB_MODULE_BAR_WIDTH:50}
+bar-width = ${env:PB_MODULE_BAR_WIDTH:45}
 bar-indicator = 
 bar-fill = |
 
@@ -96,7 +97,7 @@ tray-position = center
 
 modules-left = ${env:PB_BAR_PRIMARY_MODULES_LEFT:battery cpu memory}
 modules-center = ${env:PB_BAR_PRIMARY_MODULES_CENTER: }
-modules-right = ${env:PB_BAR_PRIMARY_MODULES_RIGHT:xbacklight volume | dropbox date}
+modules-right = ${env:PB_BAR_PRIMARY_MODULES_RIGHT:xbacklight volume | spotify dropbox date}
 
 [bar/primary-2]
 monitor = ${env:PB_MONITOR:eDP-1}
@@ -305,6 +306,16 @@ type = custom/text
 content = ${env:PB_MONITOR:eDP-1}
 content-foreground = ${res/colors.background-alt}
 
+[module/spotify]
+type = custom/script
+format = <label>
+format-prefix = "Spotify: "
+format-prefix-foreground = ${res/colors.icon-spotify}
+interval = 3
+
+exec = python $HOME/.config/polybar/scripts/spotify.py
+exec-if = pgrep spotify
+
 [module/swap]
 type = internal/memory
 format = <label>

.config/polybar/scripts/spotify.py

@@ -0,0 +1,67 @@
+#!/bin/python
+
+import sys
+import dbus
+import argparse
+
+
+parser = argparse.ArgumentParser()
+parser.add_argument(
+    '-t',
+    '--trunclen',
+    type=int,
+    metavar='trunclen'
+)
+parser.add_argument(
+    '-f',
+    '--format',
+    type=str,
+    metavar='custom format',
+    dest='custom_format'
+)
+args = parser.parse_args()
+
+# Default parameters
+output = '{artist}: {song}'
+trunclen = 25
+
+# parameters can be overwritten by args
+if args.trunclen is not None:
+    trunclen = args.trunclen
+if args.custom_format is not None:
+    output = args.custom_format
+
+try:
+    session_bus = dbus.SessionBus()
+    spotify_bus = session_bus.get_object(
+        'org.mpris.MediaPlayer2.spotify',
+        '/org/mpris/MediaPlayer2'
+    )
+
+    spotify_properties = dbus.Interface(
+        spotify_bus,
+        'org.freedesktop.DBus.Properties'
+    )
+
+    metadata = spotify_properties.Get('org.mpris.MediaPlayer2.Player', 'Metadata')
+
+    artist = metadata['xesam:artist'][0]
+    song = metadata['xesam:title']
+
+    if len(song) > trunclen:
+        song = song[0:trunclen]
+        song += '...' 
+        if ('(' in song) and (')' not in song):
+            song += ')'
+    
+    # Python3 uses UTF-8 by default. 
+    if sys.version_info.major == 3:
+        print(output.format(artist=artist, song=song))
+    else:
+        print(output.format(artist=artist, song=song).encode('UTF-8'))
+except Exception as e:
+    if isinstance(e, dbus.exceptions.DBusException):
+        print('')
+    else:
+        print(e)
+