git-commit-version.pl

#!/usr/bin/perl

use File::Basename qw<dirname>;

$branch = `git branch | grep '^\*' | sed -e 's/^\* //'`; chomp $branch;
die if $branch eq "";

if (!open(S,"git --no-pager log --max-count=1 |")) { exit 1; }
my $lcommit = "x";
my $i,$lcdate = "unknown";
foreach my $line (<S>) {
	chomp $line;

	if ($line =~ m/^commit +/) {
		$lcommit = lc($');
		$lcommit =~ s/ +$//;
	}
	else {
		my @nv = split(/: +/,$line);
		my $value = $nv[1];
		my $name = $nv[0];

		if ($name =~ m/^Date$/i) {
			# Fri Apr 15 08:51:32 2011 -0700
			#  0   1   2  3        4     5
			my @b = split(/ +/,$value);

			$mon = lc($b[1]);
			$day = $b[2];
			$time = $b[3];
			$year = $b[4];
			$mon = 1 if $mon eq "jan";
			$mon = 2 if $mon eq "feb";
			$mon = 3 if $mon eq "mar";
			$mon = 4 if $mon eq "apr";
			$mon = 5 if $mon eq "may";
			$mon = 6 if $mon eq "jun";
			$mon = 7 if $mon eq "jul";
			$mon = 8 if $mon eq "aug";
			$mon = 9 if $mon eq "sep";
			$mon = 10 if $mon eq "oct";
			$mon = 11 if $mon eq "nov";
			$mon = 12 if $mon eq "dec";
			$mon = $mon+0;
			$date = sprintf("%04u%02u%02u",$year+0,$mon,$day+0);
			$time =~ s/://g;
			$lcdate = $date."-".$time;
		}
	}
}
close(S);

print "$lcdate-$lcommit-$branch\n";