[multimedia] Add just-play-something.sh

MPC/MPD script to start playing "just something".

multimedia/README

@@ -1,3 +1,39 @@
+# just-play-something.sh #
+
+As its name indicates, the main goal of just-play-something.sh is to put
+some music on. Just anything. What the name doesn't indicate is that the
+music is played by MPD.
+
+Its use case is to be binded to a physical button of my router (which is
+also my music box), so that I don't have to start a device with an MPD
+client to start music (this is especially useful when I first wake up in
+the morning). Therefore, it is written with portability in mind and
+doesn't use any utility that might not be present on embedded systems.
+Here are the required dependencies (beside MPD itself and its
+command-like client, mpc):
+- time
+- ps
+- date
+- md5sum
+- sed
+
+What this script will do for you:
+- first of all, if the MPD daemon looks down, it will be restarted;
+  then,
+- if there are songs in the playlist but the playback is paused, it will
+  unpause;
+- if there are songs in the playlist but the playback is stopped, it
+  will start playing the playlist from the begining;
+- if there are no songs in the playlist, it will add a random album from
+  your library and play it;
+- if music is already playing, it will be paused.
+
+Tip: you can bind a short button press to just-play-something, and a
+long press (or another button) to mpc clear && just-play-something, so
+that if you don't like what is currently in the playlist, you can force
+playing a random album with a long press.
+
+
 # metflac-field2field.sh #
 
 [Français ci-dessous.]

multimedia/just-play-something.sh

@@ -0,0 +1,42 @@
+#!/bin/sh
+#
+# just-play-something.sh, Copyright © 2013 Matteo Cypriani
+#
+# This program is free software. It comes without any warranty, to
+# the extent permitted by applicable law. You can redistribute it
+# and/or modify it under the terms of the Do What The Fuck You Want
+# To Public License, Version 2, as published by Sam Hocevar. See
+# http://sam.zoy.org/wtfpl/COPYING for more details.
+#
+# This script's goal is to put some music on on your MPD server, with
+# some additional features: restart the server if it doesn't respond,
+# add a random album to the playlist if it's empty, and pause the music
+# if something is playing already.
+
+#set -x
+
+TIME="/usr/bin/time 2>&1"
+
+# Returns a random number between 1 and its first argument
+random()
+{
+  MAX=$1
+  RAND=0`(echo $$ ; /usr/bin/time ps 2>&1 ; date) | md5sum | sed 's/[a-z]//g' | sed -r 's/(.{8}).*/\1/'`
+  expr $RAND % $MAX + 1
+}
+
+# If we can't reach the server, restart it
+if ! mpc >/dev/null 2>&1 ; then
+  /etc/init.d/mpd restart
+fi
+
+# If the playlist is empty, add a random album to the playlist
+if [ "$(mpc playlist 2>/devlnull)" = "" ] ; then
+  NB_ALBUMS=`mpc list Album | wc -l`
+  RAND_ALBUM_NUM=`random $NB_ALBUMS`
+  RANDOM_ALBUM=`mpc list Album | sed -n ${RAND_ALBUM_NUM}p`
+  mpc findadd Album "$RANDOM_ALBUM"
+fi
+
+# Start playing or toggle pause
+mpc toggle >/dev/null 2>&1