Vladimir Konrad wrote:
> The question is, what concepts are necessary to grasp to be able to
> create something like that (in ruby), and, is there a good read
> (preferably on-line) about them?
> 
> Vlad

Some of the most interesting things about projects like rspec are their 
DSL features. This is: they manipulate the ruby language itself into 
something more specific to the domain for which they are writing their 
application. Creating effective DSLs is probably one of the most 
complicated processes in ruby and touches on everything from ruby's open 
classes to meta-programming to special ruby methods (method missing and 
send).

I'd recommend starting from the ground up with a couple of great books: 
why's poignant guide to ruby, programming ruby (first edition free 
online). If you want to throw down some cash I'm really liking Hal 
Fulton's The Ruby Way. Also, check out the ruby blogs out there! Tons of 
good info on the more "hardcore" aspects of ruby.

- Drew
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