NAME

Path::Ancestor - Find the longest common ancestor of N paths

SYNOPSIS

    use Path::Ancestor qw(longest_common_ancestor);

    my $ancestor = longest_common_ancestor( 
                     "/foo/bar/baz",
                     "/foo/bar/baz/moo",
                     "/foo/bar/quack" 
                   );

    # => "foo/bar"

DESCRIPTION

Path::Ancestor finds the longest common ancestor of N file paths.

Make sure that all paths are given in canonical Unix format, either all absolute or all relative. If you have a different format, use File::Spec::canonpath to sanitize your paths before feeding them to Path::Ancestor, because Path::Ancestor won't do anything fancy in this regard.

The longest common ancestor path will never have a trailing slash, except if it's the root path (/).

Examples:

    /foo/bar, /foo     => /foo
    /foo/bar, /foo/baz => /foo
    /foo1, /foo2       => /

LEGALESE

Copyright 2008 by Mike Schilli, all rights reserved. This program is free software, you can redistribute it and/or modify it under the same terms as Perl itself.

AUTHOR

2008, Mike Schilli <cpan@perlmeister.com>