Idle Hacking

Just thought this was kinda interesting, the question came up in the merb IRC channel.

<wycats> you know what would be helpful... a which command in Ruby that went through the path and figured out what the path of some require would be

So, Here's a starting point:

def which(file)
  path = $:.detect{|p| File.exist?("#{p}/#{file}.rb") }
  "#{path}/#{file}.rb" if path
end

This of course doesn't account for .so files or .bundle, but could be pretty handy to include in an irbrc for debugging.