#!/usr/bin/perl

die "usage: $0 [git-log-options] num" unless @ARGV;

my $num = 1;

for (@ARGV) {
	m{^\d+$} && (($change,$_) = ($_,undef));
	m{^-\d+$} && (($num,$_) = (-$_,undef));
}

my $grep = "--grep=^p4raw-id:.*\@$change\$";
@ARGV = grep { defined } @ARGV;

if ( -t STDOUT or @ARGV ) {
	system(qw(git log), $grep, "-$num", "--all", @ARGV);
}
else {
	system(qw(git rev-list -1 --all), $grep);
}