M.rb

#!/usr/bin/env ruby

require "pp"

module M

  def self.run(arg)
    r = `#{arg} 2>&1`
    return r
  end
  
  def self.call(args)
    _player.each do |mp|
      mp.call_if_authoritative(args)
    end
  end

  def self._player
    @_player ||= []
  end

  def self.<<(o)
    _player << o
  end

  class Player

    def self.inherited(o)
      M << o
    end

    def self.authoritative?
      false
    end

    def self.call_if_authoritative(args)
      if authoritative?
        new.do_command(args)
      end
    end

    def do_command(arg, *rest)
      if arg.to_s.size == 0
        return
      end
      cmd = send(arg)
      puts ">> #{self.class}:send: `#{cmd}` #{arg} #{PP.pp(rest, "")}"
      M.run(cmd)
    end

    def self.status
      @status ||= M.run(status_command).strip 
    end
    
    def play
      toggle
    end
  end

  class MPD < Player
    def self.status_command
      "mpc status"
    end

    def self.authoritative?
      if status =~ /^\[playing\]/ || status =~ /^\[paused\]/
        return true
      end
      false
    end

    def stop
      "mpc stop"
    end

    def toggle
      "mpc toggle"
    end

    def next
      "mpc next"
    end

    def prev
      "mpc prev"
    end
  end

  class Spotify < Player
    def self.status_command
      "playerctl -p spotify status"
    end

    def self.authoritative?
      status == "Playing" || status == "Paused"
    end

    def stop
      "sp stop"
    end

    def toggle
      #"dbus-send --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.PlayPause"
      "sp play"
    end

    def next
      #"dbus-send --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.Next"
      "sp next"
    end

    def prev
      "sp prev"
      #"dbus-send --dest=org.mpris.MediaPlayer2.spotify /org/mpris/MediaPlayer2 org.mpris.MediaPlayer2.Player.PlayPause"
    end
  end

  class Brave < Player
    def self.status_command
      "playerctl -p brave status"
    end

    def self.authoritative?
      status == "Playing" || status == "Paused"
    end

    def mk_cmd(what)
      "playerctl -p brave %s" % what
    end
    
    def stop
      mk_cmd("stop")
    end

    def pause
      mk_cmd("pause")
    end

    def toggle
      if Brave.status == "Playing"
        pause
      else
        play
      end
    end

    def next
      mk_cmd("next")
    end

    def prev
      mk_cmd("previous")
    end

    def play
      mk_cmd("play")
    end
  end

  
end

M.call(ARGV.join)