dotfiles/sway/brightness_lock.sh

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#!/usr/bin/env bash
# Locks the screens and lowers-brightness. Restores brightness on unlock
# Defaults for levels when restored
declare light_restore=3
declare ddc_restore=3
# Levels when dimmed
declare -ri light_dim=1
declare -ri ddc_dim=1
get_brightness() {
local lvl
if command -v light &>/dev/null; then
lvl="$(light -G)"
if [[ $lvl =~ ^[0-9]+(\.[0-9]+)?$ ]]; then
light_restore="$lvl"
fi
fi
if command -v ddcutil &>/dev/null; then
lvl="$(ddcutil getvcp 10 | awk '{
gsub(" ",""); # Remove spaces
split($0, a, "=");
split(a[2], a, ","); print a[1]
}')"
if [[ $lvl =~ ^[0-9]+$ ]]; then
ddc_restore="$lvl"
fi
fi
}
set_brightness() {
local -r light_lvl="$1"
local -r ddc_lvl="$2"
if command -v light &>/dev/null; then
light -S "$light_lvl"
fi
if command -v ddcutil &>/dev/null; then
ddcutil setvcp 10 "$ddc_lvl"
fi
}
swaylock &
get_brightness
set_brightness $light_dim $ddc_dim
wait %swaylock
set_brightness $light_restore $ddc_restore