#!/bin/sh
#
# SPDX-FileCopyrightText: 2023 Daniel Kalak
# SPDX-License-Identifier: Apache-2.0
#
# how to install:
#   rename this file to setroot
#   move it somewhere in your $PATH
#   change it to executable with chmod +x setroot
#
# dependencies:
#   amixer (install as alsa-utils)
#   brightnessctl
#   scrot
#   xdg-user-dir (install as xdg-user-dirs)
#   xsetroot (install as xorg-xsetroot)

case "$1" in
screenshot)
	pictures="$(xdg-user-dir PICTURES)"
	scrot "${pictures:?}/%Y-%m-%d.%H-%M-%S.png"
	msg='Screenshot taken!'
	;;
volup    ) amixer sset Master 1%+     ;;
voldown  ) amixer sset Master 1%-     ;;
voltoggle) amixer sset Master toggle  ;;
micup    ) amixer sset Capture 1%+    ;;
micdown  ) amixer sset Capture 1%-    ;;
mictoggle) amixer sset Capture toggle ;;
lightup  ) brightnessctl s +1%        ;;
lightdown) brightnessctl s 1%-        ;;
esac

title="$(date -R | sed 's/:.. / /')"

charge="$(cat /sys/class/power_supply/BAT0/capacity)"
flow="$(cat /sys/class/power_supply/BAT0/status | cut -c1)"
title="B $charge $flow | $title"

amixer_filter='s/.*\[\([0-9]*\)%\].*\[\(on\|off\)\].*/\1 \2/p; T; q'
vol="$(amixer sget Master | sed -n "$amixer_filter")"
mic="$(amixer sget Capture | sed -n "$amixer_filter")"
light="$((100 * $(brightnessctl g) / $(brightnessctl m)))"
title="L $light | M $mic | V $vol | $title"

if [ "$msg" ]
then
	title="$msg | $title"
	{ sleep 1; sh "$0"; } &
fi

xsetroot -name "$title"