RAA - chunker

Preface:

Ruby provides an automatic constant called DATA, which is an IO object
that references all text in the current file under an __END__ token.

I find it convenient to use the __END__ area to store all sorts of
stuff, rather than have to worry about distributing separate files.


The problem:

The DATA constant is determined from whatever ruby believes $0 to be.
It doesn't work inside of other required libraries, so you'll see stuff
like this all the time:

END = File.open( __FILE__ ).read.split( /^__END__/, 2 ).last

It works, but it's more work than I want to do.


A workaround:

Chunker solves this by parsing __END__ tokens for you, and making it
available in the form of a 'DATA_END' constant. It installs this
constant into the class that includes Chunker, so you can use it again
and again, assuming you use a different file for each class.

It also automatically parses out other things that look like tokens, so
you can easily have multiple, distinct documents all embedded into the
__END__ block.


Usage:

There is no direct interface to Chunker. Just include it from a
class to have that file's __END__ data blocks magically become DATA_*
IO constants within that class.


Example:

This produces the string "Yep.\n".


require 'chunker'
class Foom
include Chunker
end

puts Foom.new.class.const_get( :DATA_WICKED ).read

__END__
Stuff in the END block!
__WOW__
Ultimate success!
__WICKED__
Yep.