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#!/bin/sh
help() {
cat << EOF
${0}: Wrapper script to change volume
options:
-i [Vol] Increase volume by Vol
-d [Vol] Decrease volume by Vol
-s [Vol] Set volume to Vol
-p Show the current volume
-t Toggle between mute and unmute
-h Print this message and exit
EOF
}
err() {
for line in "${@}"; do
echo "${line}" >&2
done
exit 1
}
run() {
if ! ${1} > /dev/null 2>&1; then
err "${2}"
fi
[ -n "${3}" ] && echo "${3}"
exit 0
}
if ! command -v pactl > /dev/null 2>&1; then
err "${0}: pulseaudio must be installed"
fi
if [ $# != 1 ] && [ $# != 2 ]; then
err "${0}: Invalid usage" "Try '$0 -h' for help."
fi
while getopts "i:d:s:pth" option; do
case "${option}" in
i)
run "pactl set-sink-volume @DEFAULT_SINK@ +${OPTARG}%" \
"${0}: Failed to increase volume"
;;
d)
run "pactl set-sink-volume @DEFAULT_SINK@ -${OPTARG}%" \
"${0}: Failed to decrease volume"
;;
s)
run "pactl set-sink-volume @DEFAULT_SINK@ ${OPTARG}%" \
"${0}: Failed to set volume"
;;
t)
run "pactl set-sink-mute @DEFAULT_SINK@ toggle" \
"${0}: Failed to toggle volume"
;;
p)
if ! pactl get-sink-volume @DEFAULT_SINK@ 2>/dev/null; then
err "Failed to get current volume"
else
exit 0
fi
;;
h) help; exit 0 ;;
*) err "Try '${0} -h' for help" ;;
esac
done
err "${0}: Invalid usage" "Try '$0 -h' for help."
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