# Copyright (C) 2007 Apple Inc.  All rights reserved.

#

# Redistribution and use in source and binary forms, with or without

# modification, are permitted provided that the following conditions

# are met:

#

# 1.  Redistributions of source code must retain the above copyright

#     notice, this list of conditions and the following disclaimer. 

# 2.  Redistributions in binary form must reproduce the above copyright

#     notice, this list of conditions and the following disclaimer in the

#     documentation and/or other materials provided with the distribution. 

# 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of

#     its contributors may be used to endorse or promote products derived

#     from this software without specific prior written permission. 

#

# THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY

# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

# DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY

# DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF

# THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# Module to share code to work with various version control systems.

use strict;

use warnings;

use File::Spec;

BEGIN {

   use Exporter   ();

   our ($VERSION, @ISA, @EXPORT, @EXPORT_OK, %EXPORT_TAGS);

   $VERSION     = 1.00;

   @ISA         = qw(Exporter);

   @EXPORT      = qw(&isGitDirectory &isGit &isSVNDirectory &isSVN &makeFilePathRelative);

   %EXPORT_TAGS = ( );

   @EXPORT_OK   = ();

}

our @EXPORT_OK;

my $isGit;

my $isSVN;

sub isGitDirectory($)

{

    my ($dir) = @_;

    return system("cd $dir && git rev-parse > /dev/null 2>&1") == 0;

}

sub isGit()

{

    return $isGit if defined $isGit;

    $isGit = isGitDirectory(".");

    return $isGit;

}

sub isSVNDirectory($)

{

    my ($dir) = @_;

    return -d File::Spec->catdir($dir, ".svn");

}

sub isSVN()

{

    return $isSVN if defined $isSVN;

    $isSVN = isSVNDirectory(".");

    return $isSVN;

}

my $gitRoot;

sub makeFilePathRelative($)

{

    my ($path) = @_;

    return $path unless isGit();

    unless (defined $gitRoot) {

        chomp($gitRoot = `git rev-parse --git-dir`);

        $gitRoot =~ s/\.git$//;

    }

    my $result = File::Spec->abs2rel(File::Spec->rel2abs($path, $gitRoot));

    return $result;

}

1;