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#!/bin/sh
# SPDX-FileCopyrightText: 2023-2024 The Remph <lhr@disroot.org>
# SPDX-License-Identifier: GPL-3.0-or-later
set ${BASH_VERSION:+-o pipefail} -efmu
wobfifo=$XDG_RUNTIME_DIR/$WAYLAND_DISPLAY.swob
wobini=
set_wobini() {
for dir in ${XDG_CONFIG_HOME:+"$XDG_CONFIG_HOME"} ~/.config /etc; do
if test -r "$dir"/swob/wob.ini; then
wobini=$dir/swob/wob.ini
return
fi
done
# fine, I will make my own wob.ini(5)
wobini=${XDG_CONFIG_HOME:-~/.config}/swob/wob.ini
echo >&2 "$0: no swob/wob.ini found; writing default to $wobini"
mkdir -p "${wobini%/*}"
cat >$wobini <<EOF
[style.volume]
background_color = 000000
[style.mute]
background_color = af0000
[style.brightness]
background_color = a89800
EOF
}
start_wob() {
if test -e "$wobfifo"; then
return # Already started
fi
# temporary fifo (call mkfifo(1) asap to minimise possibility of races)
# TODO: should this be in C, so we can call mkfifo(2) and check for
# EEXIST, rather than using test(1)? Alternatively, there is flock(1),
# or any other IPC or SHM system
mkfifo -m600 "$wobfifo"
set_wobini
# spawn wob process with temporary file(s)
(
trap 'rm "$wobfifo"' 0
# Don't `exec' wob here, else the trap won't work
wob -c "$wobini" -v <$wobfifo
) &
}
do_cmd_get_percent() {
case $1 in
volume|vol)
amixer sset Master "$2" | sed -E '
# Extract percentage, keep original line for later
h
s/.*\[([0-9]+)%\].*/\1/
t match
d
: match
# Get original line back
x
# Test if audio is muted
/\[off\]/ {
g
s/$/ mute/
b
}
# else
g
s/$/ volume/
' ;;
brightness|brt)
brightnessctl -m set "$2" | sed -En 's/(.*[^0-9])?([0-9]+)%.*/\2 brightness/p'
;;
*)
echo >&2 "$0: error: unrecognised argument: $target"
exit -1
;;
esac
}
## MAIN ##
start_wob
{
do_cmd_get_percent "$@"
sleep 3 # Needs to be long enough that there aren't too many wob(1)
# processes spawned and respawned consecutively on repeated
# taps, but short enough that there aren't too many /bin/sh
# processes hanging around simultaneously running sleep(1)
# from this script! 3 seconds is an uneducated guess.
} >$wobfifo
# Don't let wob die if it's still receiving input from another process; wait
# until it says it's finished
# To solve the above mentioned problem of too many /bin/sh processes hanging
# around, we could setsid(1) wob so the script can exit without waiting as
# soon as it's done sleeping (the existing situation is that as long as one
# script sleeps, the shell that spawned the wob process will wait until that
# sleep is done)
test -z $! || wait $!
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