#!/bin/bash
#####################################################################
####### G15 Amarok Plugin Plus v1.0 (released under GPL 2.0) ########
#####################################################################
# Author:                        Robert Riemann                     #
# Report bugs and requests to:   robert.riemann@physik.hu-berlin.de #
# Requires:                      g15composer, amarok with dcop      #
#####################################################################
# The script shows the meta info to the actual track of amarok      #
# meta infos on screen: title, artist, album, current-/total-time,  #
#                       rating, bitrate and filetype                #
#####################################################################

# Check installation of g15composer
if [ -z $(which g15composer) ]; then
	echo 'g15composer could not be found. Aborting.'
	exit 1
fi

# Read Options
while getopts ":hp:s:" opt; do
	case $opt in
		p  )	if [ -p $opt ]; then
				pipe=$OPTARG
			else
				echo "$opt wasn't found or is no pipe. Aborting."
				exit 1
			fi;;
		s  )	if [ -n $OPTARG ]; then
				speed=$OPTARG
			else
				echo "Speed has to be a positive number (real). Aborting."
				exit 1
			fi;;
		? )	echo -e 'Usage:\tamarok_script_plus.sh [-h] [-p Pipe] [-s speed]'
			echo -e '\t-h : Print this help'
			echo -e '\t-p : Sets pipe to use (default: /tmp/g15amarokpluginplus'
			echo -e '\t-s : Set speed to refresh the screen (in seconds, values like 0.5 are possible)'
			exit 1;;
	esac
done

# Set standard values for pipe ( /tmp/g15amarokpluginplus ) and speed ( 1 second )
pipe=${pipe:-'/tmp/g15amarokpluginplus'}
speed=${speed:-1}

# Check for an already running g15composer with our pipe - Normally there is'nt one
composer_pid=$(pgrep -f -x "g15composer $pipe")
if [ -z $composer_pid ]; then
	g15composer $pipe & composer_pid=$!
fi
echo "g15composer - PID: $composer_pid"

# Get control about the signals to stop the g15composer and remove the pipe
trap "kill $composer_pid; rm $pipe; exit" HUP INT QUIT FPE KILL TERM

# Startposition for scrolling the title/band/album
post="0"
posb="0"
posa="0"

# Counts time for showing volume change message
timer="0"

# volume change message will be shown screentimes times. ex.: 3 seconds / 1 seconds -> 3 times. ex.: 2 / 0.3 -> 6
screentime=$(echo "3/$speed"| bc)

# Main loop, which refreshs every speed seconds the screen
while true; do
	read -t $speed amarok_stdin
	amarok_stdin_last=${amarok_stdin:-$amarok_stdin_last}

	# Shows the volume change message
	if  [ $(($timer)) -gt 0 ] || [ "${amarok_stdin%:*}" = "volumeChange" ]; then
		if [ $(( $timer )) -gt 0 ] && [ $(( $timer )) -lt $(( $screentime )) ]; then
			timer=$(( $timer - 1 ))
		else
			timer=$(( $screentime - 1 ))
		fi
		cat > $pipe << EOF # Reads the following lines up to EOF and sends it to our pipe
MC 1
PB 0 0 159 42
TO 1 2 2 1 "Volume"
DB 10 20 149 30 1 ${amarok_stdin_last#* } 100 2
TO 1 32 2 1 "${amarok_stdin_last#* }%"
MC 0
EOF

	# Show the meta infos if amarok is'nt stopped
	elif [ $(dcop amarok player status) != 0 ]; then
		# Prepares the scrolling of title, artist/band and album
		title=$(dcop amarok player title)
		if [ ${#title} -gt 16 ] && [ $((${#title} - $post)) -gt 0 ] && [ "$title" = "$titlelast" ]; then
			post=$((post + 1)); else post="0"; fi; titlelast=$title
		artist=$(dcop amarok player artist)
		if [ ${#artist} -gt 16 ] && [ $((${#artist} - $posb)) -gt 0 ] && [ "$artist" = "$artistlast" ]; then
			posb=$((posb + 1)); else posb="0"; fi; artistlast=$artist
		album=$(dcop amarok player album)
		if [ ${#album} -gt 16 ] && [ $((${#album} - $posa)) -gt 0 ] && [ "$album" = "$albumlast" ]; then
			posa=$((posa + 1)); else posa="0"; fi; albumlast=$album

		rating=$(dcop amarok player rating)
		bitrate=$(dcop amarok player bitrate)

		cat > $pipe << EOF # Reads the following lines up to EOF and sends it to our pipe
MC 1
TO 2 2 1 0 "Piste "
TO 31 2 2 0 "${title:$post:16}"
DB 0 11 159 11 1 $(dcop amarok player trackCurrentTime) $(dcop amarok player trackTotalTime) 1
TO 2 15 1 0 "Groupe  "
TO 31 15 2 0 "${artist:$posb:16}"
TO 2 24 1 0 "Album "
TO 31 24 2 0 "${album:$posa:16}"
DL 1 32 158 32 1
TO 2 34 1 0 "$(dcop amarok player currentTime)/$(dcop amarok player totalTime)"
#TO 2 34 1 1 "rating:$(printf "%2d" $rating)"
TO 2 34 1 2 "$(dcop amarok player type)${bitrate:+"/($bitrate)"}"
PB 0 0 159 42
MC 0
EOF

	# Shows the amarok stopped status screen
	else
		cat > $pipe << EOF # Reads the following lines up to EOF and sends it to our pipe
MC 1
PB 0 0 159 42
TO 1 2 2 1 "Pas de Lecture"
MC 0
EOF
	fi
	unset amarok_stdin

done