#!/bin/bash

# This is a simple program that blurs the current screen and uses it as
# a screensaver. scrot and i3lock have to be installed in order to make it 
# work. 

# i3-blur - A simple i3lock addon for a blurred screensaver
# Copyright (C) 2017 Fabrizio Romano Genovese <egonigredo@gmail.com>

# This copyrighted material is made available to anyone wishing to use,
# modify, copy, or redistribute it subject to the terms and conditions of
# the GNU General Public License v.2, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY expressed or implied, including the implied warranties of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General
# Public License for more details.

# You should have received a copy of the
# GNU General Public License along with this program; if not, 
# see <http://www.gnu.org/licenses/>

# Put this file in /bin/ or in /usr/bin. Do not forget to give 
# sudo chmod +x i3-blur 
# to make it executable.

version=1.0

if [[ "$#" -ge 2 ]]; then
	echo "Usage: $0 {-v, --version | -h --help}"
        exit 0
elif [[ "$#" -eq 1 ]]; then
	case $1 in
        -v | --version)
                echo "$0 - Version $version"
                exit 0;;
        -h | --help)
		echo "This is a simple program that blurs the current screen and uses it as a screensaver. scrot and i3lock have to be installed in order to make it work."
		echo "- v, --version            Display current version"
                echo "-h, --help                Display this message"
		exit 0;;
 	*)
		echo "Usage: $0 {-v, --version | -h, --help}"
		exit 2;;
	esac
fi

# Check if scrot and i3lock are installed
if [ -f /bin/scrot -a -f /bin/i3lock ]; then

# Take a screenshot
	scrot /tmp/screenshot.png
# Blur it
	convert /tmp/screenshot.png -blur 0x5 /tmp/screenshotblur.png
# Invoke the i3lock screensaver using it as a background
	i3lock -f -i /tmp/screenshotblur.png
else 
# Abort if they are not
	echo "i3lock and/or scrot are not installed. Please install them."
	exit 2
fi