From: Christian Johansen <chrisjoha@...>
Date: 2008-04-14T21:15:31+09:00
Subject: How to reliably setup require path

I'm writing my first Ruby command line application (beyond a simple
script) and I'm little unsure about how to structure the application and
the best use of require. I've come as far as to have the following file
structure:

myapp/
  bin/
    myapp
  docs/ (RDOC files)
  lib/
    myapp.rb
    myapp/
      files and folders here
  test/ (Test::Unit tests)

And the application is working, but there are a few things of which I am
unsure:

The bin/myapp file is a symlink to the lib/myapp.rb file which has a
shebang line. This doesn't really work, because inside lib/myapp.rb I
have:

require 'myapp/file'
require 'myapp/module/file'

which doesn't make sense when running the application from anywhere else
than myapp/lib

I also tried

$MYAPP_ROOT = File.expand_path(File.join(File.dirname(__FILE__),
'myapp'))
$LOAD_PATH << File.expand_path($MYAPP_ROOT)

Which still doesn't work because this also relies on cwd...

How do I work around this? What's the best practice way of making these
things make sense? Do you use the $RUBYLIB variable to set the full path
to the application? I was hoping to create the application as standalone
as possible, so installation will be easy.
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