From: Intransition <transfire@...>
Date: 2010-07-06T08:29:20+09:00
Subject: Golf on CLI code

I have a registry (array) of CLI classes. Each class has a class
method cli() that returns an array of strings or regular expressions
to match against ARGV to see if it is the chosen cli. Eg.

  class FooList << CLIBase
    def self.cli ;  ['foo', 'list'] ; end
    ...
  end

So if someone puts on the command line:

  $ foo list

Then the above class would match for it. I wrote the algorithm to
handle this, but I think it's Ugh-ly. Wondering if the smart folk here
might play a game of golf on it.

   def command(argv)
      lookup = registry.map{ |cc| [cc, cc.cli] }.sort{ |a,b| b[1].size
<=> a[1].size }
      x = lookup.find do |cc, cli|
        t = true
        cli.each_with_index do |r, i|
          t = t && (r === argv[i])
        end
        t
      end
      cmdc = x[0]
      argv = argv[x[1].size..-1]
      return cmdc, argv
    end