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#!/bin/sh
# SPDX-FileCopyrightText: 2023-2024 The Remph <lhr@disroot.org>
# SPDX-License-Identifier: FSFULLRWD
wobfifo=${XDG_RUNTIME_DIR:-${TMPDIR:-/tmp}}/wob
readonly wobfifo
set -o pipefail -e # `set -e' comes after readonly and pipefail, they
# aren't vital enough to kill the script for
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"
default_wobini=
for dir in ${XDG_CONFIG_HOME:+"$XDG_CONFIG_HOME"} ~/.config /etc; do
if test -r "$dir"/wob/wob.ini; then
default_wobini="$dir"/wob/wob.ini
break
fi
done
# temporary wob.ini(5) file, to set wob colours
wobini=`mktemp`
{
# This order means that a user can change the styles in
# their own config if they like
printf '[style.mute]\nbackground_color = af0000\n\n'
cat - ${default_wobini:+"$default_wobini"} <<EOF
[style.volume]
background_color = 000000
[style.mute]
background_color = af0000
[style.brightness]
background_color = a89800
EOF
} >$wobini
# spawn wob process with temporary files
(
trap 'rm "$wobini" "$wobfifo"' 0
# Don't `exec' wob here, else the trap won't work
wob -c "$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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