Get Spotify info to tmux

spotify.rb

#!/usr/bin/env ruby

# Return a short string with spotify status

require 'json'

sym = {
	:play => '►',
	:pause => '￭'
}

truncate_length = 20 

%x(pgrep -x 'Spotify')
exit 0 if $? != 0

def truncate(string, max)
  string.length > max ? "#{string[0...max]}…" : string
end

def osascript(script)
	%x(osascript -e '#{script}')
end

def spotify_info()
	script=<<EOS
tell application "Spotify" 
	set dM to round ((duration of current track / 1000) / 60) rounding down
	set dS to round ((duration of current track / 1000) mod 60) rounding down
	set pM to round (player position / 60) rounding down
	set pS to round (player position mod 60) rounding down
  set info to "{"
	set info to info & "\\"artist\\": \\"" & artist of current track as string & "\\","
	set info to info & "\\"album\\": \\"" & album of current track as string & "\\","
	set info to info & "\\"track\\": \\"" & name of current track as string & "\\","
	set info to info & "\\"uri\\": \\"" & spotify url of current track as string & "\\","
	set info to info & "\\"duration_min\\": \\"" & dM as string & "\\","
	set info to info & "\\"duration_sec\\": \\"" & dS as string & "\\","
	set info to info & "\\"state\\": \\"" & player state & "\\","
	set info to info & "\\"position_min\\": \\"" & pM as string & "\\","
	set info to info & "\\"position_sec\\": \\"" & pS as string & "\\""
  set info to info & "}"
end tell
return info
EOS
	JSON.parse(osascript(script))
end

# playing, paused
info = spotify_info

# do not show anything if not playing
exit 0 if info['state'] != 'playing'

info['state_icon'] = info['state'] == 'playing' ? sym[:play] : sym[:pause]

printf("[%s %s - %s]", 
	info['state_icon'], 
	truncate(info['artist'], truncate_length), 
	truncate(info['track'], truncate_length)
)