#!/usr/bin/perl

# Copyright (C) 2019 Sean Whitton
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or (at
# your option) any later version.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty 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/>.

use 5.028;
use strict;
use warnings;

our $tolerance = 50;
our $jitter    = 50;

my $xdpyinfo = `xdpyinfo`;
$xdpyinfo =~ /dimensions:    ([0-9]+)x([0-9]+)/;
my ($width, $height) = ($1, $2);
my $getmouselocation = `xdotool getmouselocation`;
$getmouselocation =~ /x:([0-9]+) y:([0-9]+)/;
my ($x, $y) = ($1, $2);

if ($width - $x > 0 && $width - $x < $tolerance) {
    move(-$jitter, 0);
} elsif ($x < $tolerance) {
    move($jitter, 0);
}
if ($height - $y > 0 && $height - $y < $tolerance) {
    move(0, -$jitter);
} elsif ($y < $tolerance) {
    move(0, $jitter);
}

sub move { system "xdotool mousemove_relative --sync -- $_[0] $_[1]" }