use strict;
use warnings;

package incdec;

sub incdec {
	my ($line, $increment_by, $point_position, $is_backward) = @_;

	$point_position ||= 0;
	$is_backward ||= 0;

	my $start_position = 0;
	my $previous_match_start = 0;
	while ($line =~ /(-?\d+)/g) {
		if ($is_backward) {
			# Set start position to the current match start. This gives us the
			# correct start position when incrementing the last number in a
			# line.
			$start_position = $-[0];

			# If point is not at the end, set start position to the number
			# closest to the point position.
			if ($point_position < $-[0]) {
				$start_position = $previous_match_start;

				last;
			}

			$previous_match_start = $-[0];
		}
		else {
			if ($point_position < $+[0]) {
				$start_position = $-[0];

				last;
			}
		}
	}

	pos($line) = $start_position;
	$line =~ s/\G([^-\d]*)(-?\d+)/$1 . ($2 + $increment_by)/e;

	return $line;
}

1;