Hook up MPD (MPC) to work with the CM Storm Ninja (And Filcos?) in Karabiner.

private.xml

<?xml version="1.0"?>
<root>
  <vkopenurldef>
    <name>KeyCode::VK_OPEN_URL_SHELL_mpc_playpause</name>
    <url type="shell">
      <![CDATA[
      MPC=/usr/local/bin/mpc

      if $MPC status | grep -q 'playing'
      then
        $MPC pause
      else
        $MPC play
      fi
      ]]>
    </url>

  </vkopenurldef>

  <vkopenurldef>
    <name>KeyCode::VK_OPEN_URL_SHELL_mpc_previous</name>
    <url type="shell">
      <![CDATA[ /usr/local/bin/mpc prev ]]>
    </url>
  </vkopenurldef>

  <vkopenurldef>
    <name>KeyCode::VK_OPEN_URL_SHELL_mpc_next</name>
    <url type="shell">
      <![CDATA[ /usr/local/bin/mpc next ]]>
    </url>
  </vkopenurldef>

  <item>
    <name>Make Play/Pause work with MPD.</name>
    <identifier>private.play_pause_mpd</identifier>
    <autogen>
      __KeyToKey__
      ConsumerKeyCode::MUSIC_PLAY,
      KeyCode::VK_OPEN_URL_SHELL_mpc_playpause
    </autogen>
  </item>

  <item>
    <name>Make Previous work with MPD.</name>
    <identifier>private.mpc_previous</identifier>
    <autogen>
      __KeyToKey__
      ConsumerKeyCode::MUSIC_PREV_0x12,
      KeyCode::VK_OPEN_URL_SHELL_mpc_previous
    </autogen>
  </item>

  <item>
    <name>Make Next work with MPD.</name>
    <identifier>private.mpc_next</identifier>
    <autogen>
      __KeyToKey__
      ConsumerKeyCode::MUSIC_NEXT_0x11,
      KeyCode::VK_OPEN_URL_SHELL_mpc_next
    </autogen>
  </item>
</root>