# NAME

lib::root - find perl root and push lib modules path to @INC

# VERSION

version 0.02

# SYNOPSIS

lib::root looks for a .libroot file on parent directories and pushes ./\*/lib to @INC.

When a file does "use lib::root", lib::root will try to read the file parent directories and look for a rootfile (default is .libroot) that is usually located inside a /some/dir/perl that contains many modules used by your app. Many apps have a /some/dir/perl/.perl-version file inside a perl directory, when that is the case, the app can piggy back on that filename and look for that file instead of .libroot with the example below:

    use lib::root rootfile => '.perl-version';

To use the defaults, create an empty file named .libroot and place it in your /app/dir/perl/.libroot

    use lib::root;

    ... or use another custom file to determine a libroot

    use lib::root; # rootfile defaults to .libroot
    use lib::root rootfile => '.perl-version';

    ... or add a callback if needed

    use lib::root callback => sub { ... };

    ... or look for a given file in approot and use a perl root dir to push to inc

    use lib::root rootfile => '.app-root', path => 'perl';

# WHY IS THIS USEFUL

lib::root can be useful when your application perl modules are not installed globally.

When your app uses lib::root, the lib::root will look for the .libroot file into parent directories relative to the file using it.

For example, your app has the following structure:

    /dir/myapp/perl/MyApp-Thing/lib/...
    /dir/myapp/perl/MyApp-Another/lib/...
    /dir/myapp/perl/MyApp-Stuff/lib/...
    /dir/myapp/perl/.perl-version
    /dir/myapp/bin/some_script.pl
    /dir/myapp/bin/another_script.pl
    /dir/myapp/.app-root

... and the app needs to push all those perl/\*/lib to @INC. There are some ways to do that

Add the directory to env PERLLIB or PERL5LIB

    PERLLIB=$PERLLIB:/dir/myapp/perl/MyApp-Thing/lib:/dir/myapp/perl/MyApp-Another/lib

Or use -I

    perl -I/dir/myapp/perl/MyApp-Thing/lib -I/dir/myapp/perl/MyApp-Another/lib

Or use a BEGIN block:

    BEGIN { push @INC, glob "/dir/myapp/perl/*/lib"; }

Or use lib::root:

    use lib::root rootfile => '.perl_is_here';

lib::root can also be instructed to look in a cousin dir relative to "bin" in the structure above

    use lib::root path => '../perl';

Or use lib

    use FindBin qw($Bin);
    use lib "$Bin/../lib";
    use lib "/home/user/MyApp/lib";

Or some other way ...

## SEE ALSO

Similar ideas have been implemented before in the modules below and possibly others

- RepRoot

    [https://metacpan.org/pod/RepRoot](https://metacpan.org/pod/RepRoot)

- lib::glob

    [https://metacpan.org/pod/lib::glob](https://metacpan.org/pod/lib::glob)

# LICENSE

Copyright (C) Hernan Lopes.

This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.

# AUTHOR

Hernan Lopes <hernan@smallcompany.net>

# POD ERRORS

Hey! **The above document had some coding errors, which are explained below:**

- Around line 146:

    '=item' outside of any '=over'

- Around line 154:

    You forgot a '=back' before '=head1'