/ 
lib-abs-0.95
River stage two • 37 direct dependents • 68 total dependents
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 / lib::abs
++ed by:
ROMANF PINGAN CHIPSOID BESSARABV

4 PAUSE users
2 non-PAUSE users.

Author image Mons Anderson
and 1 contributors

NAME

lib::abs - lib that makes relative path absolute to caller.

SYNOPSIS

Simple use like use lib ...:

        use lib::abs qw(./mylibs1 ../mylibs2);
        use lib::abs 'mylibs';
        
        # if your path may not exists and it is ok, then:
        use lib::abs -soft => qw(./mylibs1 ../mylibs2);

Extended syntax (glob)

        use lib::abs 'modules/*/lib';

There are also may be used helper function from lib::abs (see example/ex4):

        use lib::abs;
        # ...
        my $path = lib::abs::path('../path/relative/to/me'); # returns absolute path

DESCRIPTION

The main reason of this library is transformate relative paths to absolute at the BEGIN stage, and push transformed to @INC. Relative path basis is not the current working directory, but the location of file, where the statement is (caller file). When using common lib, relative paths stays relative to curernt working directory,

        # For ex:
        # script: /opt/scripts/my.pl
        use lib::abs '../lib';

        # We run `/opt/scripts/my.pl` having cwd /home/mons
        # The @INC will contain '/opt/lib';

        # We run `./my.pl` having cwd /opt
        # The @INC will contain '/opt/lib';

        # We run `../my.pl` having cwd /opt/lib
        # The @INC will contain '/opt/lib';

Also this module is useful when writing tests, when you want to load strictly the module from ../lib, respecting the test file.

        # t/00-test.t
        use lib::abs '../lib';

Also this is useful, when you running under mod_perl, use something like Apache::StatINC, and your application may change working directory. So in case of chdir StatINC fails to reload module if the @INC contain relative paths.

RATIONALE

Q: We already have FindBin and lib, why we need this module?

A: There are several reasons:

1) FindBin could find path incorrectly under mod_perl
2) FindBin works relatively to executed binary instead of relatively to caller
3) Perl is linguistic language, and `use lib::abs "..."' semantically more clear and looks more beautiful than `use FindBin; use lib "$FindBin::Bin/../lib";'
4) FindBin b<will> work incorrectly, if will be called not from executed binary (see http://github.com/Mons/lib-abs-vs-findbin comparison for details)

BUGS

None known

COPYRIGHT AND LICENSE

This software is copyright (c) 2007-2020 by Mons Anderson.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

AUTHOR

Mons Anderson, <mons@cpan.org>

CONTRIBUTORS

Oleg Kostyuk, <cub@cpan.org>