From: Joel VanderWerf <joelvanderwerf@...>
Date: 2010-07-06T13:46:43+09:00
Subject: Re: Golf on CLI code

Intransition wrote:
>    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

Untested:

   def command(argv)
     lookup = registry.sort_by {|cc| cc.cli.size}
     cmdc = lookup.find do |cc|
       cc.cli.zip(argv).all? do |r,arg|
         r === arg
       end
     end
     return cmdc, argv[cmdc.cli.size..-1]
   end

The following (assuming it works!) would be more compact still:

   class Symbol
     alias old_to_proc to_proc
     def to_proc
       case self
       when :=== # etc.
         proc {|x,y| x === y}
       else
         old_to_proc
       end
     end
   end

   def command(argv)
     lookup = registry.sort_by {|cc| cc.cli.size}
     cmdc = lookup.find do |cc|
       cc.cli.zip(argv).all?(&:===)
     end
     return cmdc, argv[cmdc.cli.size..-1]
   end