pianobar event script to maintain a JSON file of the last 10 songs played

pianobar_recent_json.rb

#!/usr/bin/ruby

# pianobar event script to maintain a JSON file of the last 10 songs played

# Copyright (c) 2010
# Matthew M. Boedicker <matthewm@boedicker.org>

# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.

# add this script to ~/.config/pianobar/config by adding
# event_command = path_to_this_script/pianobar_recent_json.rb

require 'json'

event = ARGV.first

filename = 'recent_music.json'
local_path = File.join('/home/mmb/', filename)

if event == 'songfinish'
  new_song = {}

  STDIN.each_line { |line| new_song.store(*line.chomp.split('=', 2)) }

  percent_played = new_song['songPlayed'].to_f / new_song['songDuration'].to_i

  if percent_played > 0.75
    recent_songs = []

    if File.exists?(local_path)
      open(local_path) do |f|
        json = f.read
        recent_songs = JSON.parse(json) unless json.empty?
      end
    end

    new_song['time'] = Time.now.httpdate

    recent_songs.unshift(new_song)

    open(local_path, 'w') do |f|
      f.write(JSON.pretty_generate(recent_songs.slice(0..9)))
    end

    `rsync #{local_path} you@yourhost.com:#{filename}`
  end

end