From: Brian Candler <b.candler@...>
Date: 2010-03-23T22:59:44+09:00
Subject: Re: require, from within lib, files located under the local path

Jean-denis Vauguet wrote:
> I don't know if this practice of relying on $0 is solid, though.

It's very risky:
* on many platforms it's truncated
* the script which the user started running isn't necessarily the file 
which is requiring your code

I suggest you look at Kernel#caller instead.

Unfortunately it just gives you strings which you have to parse 
yourself, and you'll probably need to grep out all the rubygems-related 
paths.

For an example, look in the sinatra gem (lib/sinatra/base.rb, 
specifically methods caller_locations and caller_files). Sinatra uses 
this to locate the application source code, for reading inline 
templates.

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