#!/bin/bash
# Script:	pulseaudioselector.sh
# Task:		Provide a zenity GUI to select sinks and sources for Audio

# global variables
SCRIPTNAME=$(basename ${0} .sh)

EXIT_SUCCESS=0
EXIT_FAILURE=1
EXIT_ERROR=2
EXIT_BUG=10

# variables for option switches with default values
SINKORSOURCE="both"

# functions
function usage {
	echo "${SCRIPTNAME} lets you select an input and output device" >&2
	echo "for the PulseAudio audiosystem. Unfortunately, the GUI" >&2
	echo "padevchooser doesn't have that functionality..." >&2
	echo >&2
	echo "Usage: ${SCRIPTNAME} [-o (both|sink|source)]" >&2
	[[ ${#} -eq 1 ]] && exit ${1} || exit ${EXIT_FAILURE}
}

# Option -o takes one argument, either "both", "sink" or "source" and
# defines what io device to change.
while getopts 'o:' OPTION ; do
	case ${OPTION} in
		o)	SINKORSOURCE="${OPTARG}"
			if [ "${SINKORSOURCE}" != "both" -a "${SINKORSOURCE}" != "sink" -a "${SINKORSOURCE}" != "source" ] ; then
				usage ${EXIT_ERROR}
			fi
			;;
		h)	usage ${EXIT_SUCCESS}
			;;
		\?)	echo "unknown option \"-${OPTARG}\"." >&2
			usage ${EXIT_ERROR}
			;;
		:)	echo "option \"-${OPTARG}\" requires an argument." >&2
			usage ${EXIT_ERROR}
			;;
		*)	echo "Impossible error. parameter: ${OPTION}" >&2
			usage ${EXIT_BUG}
			;;
	esac
done

if [ "${SINKORSOURCE}" == "both" ] ; then
# Call ourselves twice
	$0 -o sink
	$0 -o source
	exit ${EXIT_SUCCESS}
fi

# set language to C so that we get parsable output
export LANG=C

tmpdir="`mktemp -d`"
if [ -z "${tmpdir}" ] ; then
	zenity --error --text='Could not create a temporary directory!'
	exit ${EXIT_ERROR}
fi

trap "rm -f \${tmpdir}/*; rmdir \${tmpdir}" EXIT

unset name description devices
while IFS=: read key value ; do
	if [ "${key}" == "index" -o "${key}" == "* index" ] ; then
		if [ -n "${name}" -a -n "${description}" ]; then
			devices="${devices}${devices:+ }${active} \"${description}\" \"${name}\""
		fi
		active="FALSE"
		[ "${key:0:1}" == "*" ] && active="TRUE"
		unset name description
	fi
	if [ "${key}" == "name" ] ; then
		name="${value}"
		name="${name##*<}"
		name="${name%%>*}"
		name="${name#\"}"
		name="${name%\"}"
	fi
	if [ "${key}" == "device.description" ] ; then
		description="${value}"
		description="${description#\"}"
		description="${description%\"}"
	fi
done < <( pacmd list-${SINKORSOURCE}s | sed -e 's,^[ \t]\+,,g' -e 's, = ,:,' ; echo -e "\nindex: -1" )

io="output"
[ "${SINKORSOURCE}" == "source" ] && io="input"
eval zenity --list '--title="Please select ${io} device"' --radiolist '--text="Please select ${io} device"' \
	     --column '" "' --column '"Description"' --column '" "' --hide-column 3 --print-column "ALL" \
	     --height 400 --width 800 ${devices} > ${tmpdir}/newdevice
IFS=\| read desc newdevice < ${tmpdir}/newdevice

# User pressed Cancel
[ -z "${newdevice}" ] && exit ${EXIT_FAILURE}

( echo "set-default-${SINKORSOURCE} ${newdevice}" ) | pacmd 2>&1 > ${tmpdir}/returnmessage

if [ ${?} -eq 0 ] ; then
	zenity --info --text "New ${io} device: ${desc}"
else
	zenity --error < ${tmpdir}/returnmessage
fi

exit ${EXIT_SUCCESS}