From: Jean-denis Vauguet <jd@...>
Date: 2010-03-23T14:39:07+09:00
Subject: require, from within lib, files located under the local path

Hi.

Here's an issue I've not been able to solve for some time now.

Let's say I designed a tiny library, following a standard structure:

$ tree
.
|-- LICENSE
|-- README.md
|-- Rakefile
|-- VERSION
|-- lib
|   |-- mylib
|   |   `-- core.rb
|   `-- metamorphosis.rb
|-- metamorphosis.gemspec
`-- test

Using Jeweler to build and install the gem (successfully), it goes into
(for instance): home/YOU/.rvm/gems/ruby-1.9.1-p378/gems/mylib-0.1.0/

The purpose of mylib involves allowing the user who will eventually
perform a require 'mylib', to create, along the file.rb performing the
require, a folder (let's call it mylib_stuff). So the user sets up the
following structure:

$ tree
.
|-- main.rb
`-- mylib_stuff
    |-- a_piece_of stuff.rb
    |-- ...
    `-- another_piece_of_stuff.rb

The core.rb file needs to use what's inside mylib_stuff/*. Using the
standard technique: require File.expand_path("../../mylib_stuff",
__FILE__), you end up with the following error: no such file to load --
/home/YOU/.rvm/gems/ruby-1.9.1-p378/gems/mylib-0.1.0/mylib_stuff/[foobar]

That's because __FILE__ is core.rb. So what I'd like to do is passing
require a path which would be aware of the location the gem mylib is
used from, so it'll access this particular path. Another script using
mylib would trigger different require statements in core.rb, involving
it's very own mylib_stuff local directory.

Thank you!
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