#!/usr/bin/env perl

## commit-check --- Simple git commit style checker
# Copyright (C) 2014  Tom Willemse <tom@ryuslash.org>

# commit-check 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.

# commit-check 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 commit-ccheck. If not, see <http://www.gnu.org/licenses/>.

use strict;
use warnings;

my $lineno = 0;
my $status = 0;

sub err {
    my ($msg) = @_;

    print STDERR "Error on line $lineno (actual line $.): ". $msg ."\n";
    $status = 1;
}

open(my $commitfile, "<", $ARGV[0]) or die "Couldn't open $ARGV[0]";

while (<$commitfile>) {
    next if /^#/;                 # Discard comments
    next if $lineno == 0 && /^$/; # Discard leading empty lines
    $lineno++;                    # Start at 1, so increment first

    if ($lineno == 1) {
        err "Not capitalized" if /^[^[:upper:]]/;
        err "Longer than 50 characters" if /^.{51,}/;
        next;
    }

    err "Should be empty" if $lineno == 2 && /.+/;
    err "Longer than 72 characters" if /^.{73,}/;
}

close $commitfile;
exit $status;