#!/usr/bin/env perl 

use strict;
use warnings;

# FILENAME: ls_sha1.pl
# CREATED: 29/05/12 16:42:08 by Kent Fredric (kentnl) <kentfredric@gmail.com>
# ABSTRACT: List all sha1's in parent order in current git repo

use Path::Class qw( dir );

my $cwd = dir( q{.} );

sub is_git_dir {
	my ( $dir ) = @_;
	return unless -e $dir->subdir( 'objects' );
	return unless -e $dir->subdir( 'refs' );
	return unless -e $dir->file( 'HEAD' );
	return 1;
}

sub find_git_dir {
	my $start = shift;
	if ( is_git_dir( $start ) ) {
		return $start;
	}
	if ( -e $start->subdir( '.git' ) && is_git_dir( $start->subdir( q{.git} ) ) ) {
		return $start->subdir( '.git' );
	}
	if ( $start->parent->stringify ne $start->stringify ) {
		return find_git_dir( $start->parent );
	}
	die "No Git Directory found";
}

require Git::PurePerl;
require Git::PurePerl::Walker;
require Git::PurePerl::Walker::Method::FirstParent;

sub trim {
	my $comment = shift;
	$comment =~ s/\s+/ /g;

	#if ( length( $comment ) > 80 ) {
	#	return substr( $comment, 0, 80 ) . '...';
	#}
	return $comment;
}

sub abbr_sha {
	my $sha = shift;
	return substr $sha, 0, 8;
}

my $repo = Git::PurePerl->new( gitdir => find_git_dir( $cwd ), );
use CPAN::Changes;
use CPAN::Changes::Release;
my $release = CPAN::Changes::Release->new(
	version => '1.0',
	date    => '2012-05-30',

);

my $walker = Git::PurePerl::Walker->new(
	repo      => $repo,
	method    => 'FirstParent::FromHEAD',
	on_commit => sub {
		my $commit = shift;
		$release->add_changes(
			{ group => 'Git::Changes' },
			sprintf "%s %s (%s)",
			abbr_sha( $commit->sha1 ),
			trim( $commit->comment ),
			$commit->author->name
		);
	},
);

$walker->step_all;
my $changes = CPAN::Changes->new( preamble => "Revision History for \$Project", );
$changes->add_release( $release );
print $changes->serialize();