#!/bin/bash

MUTEX="${HOME}/.config/i3/i3-lock"
LOG="${HOME}/.config/i3/lock-log"
NOLOCK="${HOME}/.config/i3/NOLOCK"

VERSION="0.5"

log () {
	when=$(date "+%Y-%m-%d %H:%M:%S")
	msg="[lock ${VERSION}] ${when} $1"
	echo "${msg}" >> "${LOG}"
}

lock () {
	if [ ! -f "${NOLOCK}" ]; then
		i3lock --nofork --image ~/.config/i3/i3lock.png --tiling --ignore-empty-password --show-failed-attempts
	else
		log "${NOLOCK} found, not locking"
	fi
}

if [ "$1" = force ]; then
	log "Forcing lock, removing ${NOLOCK} and ${MUTEX}"
	rm -rf "${NOLOCK}"
	rm -rf "${MUTEX}"
fi

# See https://mywiki.wooledge.org/BashFAQ/045
if /bin/mkdir "$MUTEX"; then
	log "Successfully acquired lock"

	trap 'rm -rf "$MUTEX"' 0	# remove mutex when script finishes

	lock
else
	log "cannot acquire lock, giving up on $MUTEX"
	exit 0
fi