radio

#!/usr/bin/env bash
# vim: set fileencoding=utf-8 :
#======================================================================================================================#
#
#   Copyright © 2012 George A Stamoulis (g.a.stamoulis@gmail.com)
#
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
#======================================================================================================================#
#
# Bash script for listening to internet radio stations via the terminal.
# It is depending on vlc (vlc -I dummy) and cut.
#
# Insert any station you like in the stations file.
# Separate the name and the address by a whitespace and
# don't forget to separate the entries with newlines as well.
#
# Enjoy ;)
#
#======================================================================================================================#

tempdir="$HOME/temp"
radiopid="$tempdir/radio.pid"
stations="/etc/stations.csv"
[[ ! -d $tempdir ]] && mkdir $tempdir

# Killing the process without hassle!
if [ "$1" == "kill" ]; then
    if [ -e "$radiopid" ]; then
        kill $(cat "$radiopid") &> /dev/null
        if [ $? -gt 0 ]; then
            echo "Invalid pid. Please kill manyally (or use \"killall\")." 1>&2
            exit 2
        fi
        rm -f "$radiopid"
        exit 0
    else
        echo "Unable to retrieve pid. Please kill manually (or use \"killall\")." 1>&2
        exit 2
    fi
elif [ "$1" == "killall" ]; then
        e=0
    for pid in $(ps -eo pid,cmd | grep "vlc -I dummy" | grep -v "grep" | sed s'/^\s*//'g | cut -d' ' -f1); do
        kill $pid
        let e+=$?
    done
    if [ $pid ]; then
        echo "Some were found."
        exit $e
    else
        echo "Nothing found.." 1>&2
        exit 2
    fi
fi

if [ $# -lt 1 ]; then # If user doesn't provide a station, we will ask him to choose.
    i=0
    while read line; do
        names[$i]=$(echo $line | cut -d',' -f1)
        let i++
    done < $stations

    PS3="Select station. " #PS3 is the prompt that select uses. We set it to something more relevant than "#?".
    select choise in ${names[@]}; do
        if [[ -n $choise ]]; then
            station=$choise
            break
        else
            echo "Invalid input."
        fi
    done
elif [ $# -gt 1 ]; then # If user provides more than 1 argument, we exit gracefully!
    echo -e "You can listen only one radio station at a time.\nKeep that in mind!" 1>&2
    exit 1
else # Finally, user has provided one station at the command line and we assign it to our variable.
    station=$1
fi

# We get the address for the requested station.
while read line; do
    name=$(echo $line | cut -d',' -f1)
    if [ "$name" == "$station" ]; then
        address=$(echo $line | cut -d',' -f2)
        break
    fi
done < $stations

# We assert that we got a valid address from our list and if not we exit.
if [[ -n $address ]]; then
    [ -e "$radiopid" ] && kill $(cat "$radiopid")  &> /dev/null # We kill previous instance if exists.
    vlc -I dummy --quiet $address 0<&- &> /dev/null &
    echo $! > "$radiopid"
    exit 0
else
    echo "Unknown station \"$station\". Please try again." 1>&2
    exit 2
fi

#======================================================================================================================#