diff options
Diffstat (limited to 'swob.sh')
| -rwxr-xr-x | swob.sh | 107 |
1 files changed, 107 insertions, 0 deletions
@@ -0,0 +1,107 @@ +#!/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 $! |