xes (light radio-streaming script with tracks titles saving)

#! /bin/bash
#22.02.17
#08.01.18
#Csandriel


#depends on: mpv

#username, will be used to launch the script, if it called by root.
#To avoid ussues with permissions
USER=user
#keep track of all played traks ^_^. Must have liberal permissions
#items for the best-list is taken from the tail of this "journal"
LOG="/home/bin/.xes-mus.log"
#these files too must be accesible for writing to everyone
#best list
BEST="/home/bin/.xes-bestmusic.log"

#We'll run in background. Need a reference to be killed with.
PIDFILE="/home/bin/.xes.pid"

ADDRESSeS=(\
#radio address:port. Put additional adresses here. Obey '\' finisher in all strings except the last
"http://radio.heavy-music.ru:8107/320" \
"https://stream.laut.fm/moshhead-gothic" \
"http://streams.radiobob.de/gothic/mp3" \
"https://stream.spreeradio.de/spree-live/mp3" \
"https://0n-gothic.radionetz.de/0n-gothic.mp3" \
"http://channels.fonotron.ru/stream/Chan_74_256.mp3" \
"http://chanson.hostingradio.ru:8041/chanson256.mp3" \
"http://ic2.101.ru:8000/v11_1" \
"http://ep256.hostingradio.ru:8052/europaplus256.mp3" \
"http://video.tvr.by:8000/culture" \
"http://air2.radiorecord.ru:805/mdl_320"
"http://ice912.echo.msk.ru:9120/32.aac" \
"http://rfe04.akacast.akamaistream.net/7/894/437768/v1/ibb/akacast.akamaistream.net/rfe04" \
"http://rfe10.akacast.akamaistream.net/7/894/437768/v1/ibb/akacast.akamaistream.net/rfe10" \
"http://stream.euroradio.fm:8000/euroradio1"
)




USAGE_MSG="  \n Usage: xes [-k|-s|-l|-c|-h <number>|-r|-v <number>] \n
where \n -k -- kill; \n -s -- save current track to the best-list \n -l -- roll-out the best-list
-r -- clear the best-list \n -n -- show current playing track \n -c <number> -- select a chanell; if not selected CHAN 0 is used \n -v <number> -- set volume in percetage; if not set then 100 by default"
#username.
USER=user
RESTART_MSG=\'"$PIDFILE' exists. It seems xes have been launched yet. Killing/Cleaning/Restart. \n Log-file will be reseted."

#if launched as root then restart script as user
if [ $UID -eq 0 ] ; then echo "DROP ROOT & recurse"; STRING="$@"; su $USER -c "$0 $STRING"; exit; fi



dokill () {
    cat "$PIDFILE"|xargs kill; rm "$PIDFILE" "$LOG"
    }

doplay (){

    #-----------------------
    #is xes running?
    if [ -f $PIDFILE ]; then
        echo -e $RESTART_MSG; dokill;
        fi

    #-----------------------
    #is $CHAN a valid index?
    if [ $((CHAN)) -gt $((${#ADDRESSeS[@]}-1)) ]; then
        echo "lenght of ADDRESSeS= ${#ADDRESSeS[@]}"
        echo "requested CHAN index exeeds existig array"
        exit 1;
    fi

    #-----------------------
    #if $CHAN or $VOL is not set  then using by defaults
    ADDRESS=${ADDRESSeS[${CHAN:-0}]}
    echo "address set to $ADDRESS; "
    VOLUME=${VOL:-100}
    echo "volume set to $VOLUME"

    mpv --volume="$VOLUME" "$ADDRESS"  1>"$LOG" 2>/dev/null &
    PID=$!
    echo '$PID='"$PID"

        echo "$PID" > "$PIDFILE"
    }
    while getopts kslnrv:c: Option
    do
        case "$Option" in
            "k") if [ -f $PIDFILE ] ; then dokill ;
            else echo "xes is down. There is left only to kill yourself"; fi
                exit 0
                ;;
            "s") cat $LOG|tail -n 2|grep icy|sed "s_.*title:\([^;]*\).*_\1_" >> $BEST
                exit 0
                ;;
            "l") cat "$BEST"
                exit 0
                ;;
            "n") echo "Now playing:"
                cat $LOG|tail -n2|grep icy|sed "s_.*title:\([^;]*\).*_\1_"

                exit 0
                ;;
            "r") echo "BEST-LIST WILL BE CLEANCED! Are You sure? [y/<any key>]"
                read r; if [ "$r" == "y" ] ; then > "$BEST" ; else exit 0; fi
                exit 0
                ;;
            "c") CHAN=$OPTARG
                ;;
            "v") VOL=$OPTARG
                ;;
            * ) echo -e "$USAGE_MSG"
            exit 1

            ;;
        esac
    done
doplay