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|
#!/bin/sh
set -eu
usage() {
cat <<-'EOF'
Usage:
volume ACTION
volume -h
EOF
}
help() {
cat <<-'EOF'
Options:
-h, --help show this message
ACTION one of:
- up
- down
- toggle
- rotate
Manage the audio output.
Examples:
Increase the volume:
$ volume up
Toggle mute/unmute in the current audio output:
$ volume toggle
Change the audio output:
$ volume rotate
EOF
}
for flag in "$@"; do
case "$flag" in
(--)
break
;;
(--help)
usage
help
exit
;;
(*)
;;
esac
done
while getopts 'h' flag; do
case "$flag" in
(h)
usage
help
exit
;;
(*)
usage >&2
exit 2
;;
esac
done
shift $((OPTIND - 1))
ACTION="${1:-}"
eval "$(assert-arg -- "$ACTION" 'ACTION')"
rotate() {
# This script assumes that at most 2 sinks exist at any time.
# When this premise is no longer true, it needs to be upgraded.
CURRENT="$(pacmd list-sinks | grep '\* index' | cut -d: -f2 | tr -d ' ')"
OTHER="$(pacmd list-sinks | grep index | grep -v '\* index' | tail -n1 | cut -d: -f2 | tr -d ' ')"
if [ "$CURRENT" = 0 ]; then
pacmd set-default-sink "$OTHER"
else
pacmd set-default-sink 0
fi
}
case "$ACTION" in
up)
pactl set-sink-volume @DEFAULT_SINK@ +10%
;;
down)
pactl set-sink-volume @DEFAULT_SINK@ -10%
;;
toggle)
pactl set-sink-mute @DEFAULT_SINK@ toggle
;;
rotate)
rotate
;;
*)
printf 'Bad ACTION: %s.\n\n' "$ACTION" >&2
usage >&2
exit 2
;;
esac
|
