#!/usr/bin/env ruby -w

$STUB = true

module Stub
  REVISION = '$Id: stub.rb,v 1.3 2003/02/17 05:42:21 drbrain Exp $'
end

class Object

  def method_missing(meth, *args)
    result = nil
    method_exists = false
    my_caller = caller[1] || caller[0]
    fn = File.basename(my_caller.split(':').first, '.rb') + '_missing.rb'

    begin
      unless my_caller =~ /in `method_missing'/ then
        load fn
        result = self.__send__(meth, *args)
        method_exists = true
      end

    rescue LoadError => err

    rescue RuntimeError => err
      # XXX may not be needed
      if err.message =~ /not implemented \(stub\)/ then 
        method_exists = true
      end

    end

    unless method_exists then
      File.open(fn, 'a') do |fp|
        fp << "class #{self.class}\n"
        fp << "  def #{meth}"

        if args.length > 0 then
          fp << "("
          fp << (1..args.size).map { |x| "arg#{x}" }.join(", ")
          fp << ")"
        end

        fp << "\n"
        fp << "    unless $STUB then\n"
        fp << "      raise RuntimeError, '#{self.class}##{meth} not implemented (stub)'\n"
        fp << "    end\n  end\nend\n"
      end
    end

    return result
  end

end

if __FILE__ == $0 then

  def baz
    foo
  end

  foo

  true.bar

  baz
  
end