From: Brian Candler <b.candler@...>
Date: 2009-02-17T05:27:14+09:00
Subject: Re: load a Ruby source with params

Sai Hl wrote:
> I am going to try to use the (2) solutions, with a module for any files 
> like:
> 
> # inc.test.rb
> module Inc
>   def say
>     'Hello' + subject
>   end
> end
> 
> But is this possible in my case, because I don't know the name of each 
> module (which is depend of the name of its file)?

If you are consistent in your naming, you can map the filename to the 
module name (or vice versa). For example, look at the underscore and 
camelize methods of ActiveSupport from Rails. These just convert FooBar" 
to "foo_bar", and vice versa.

Then you can use const_get to convert the name "FooBar" to the actual 
module instance on which to invoke the method. e.g.

  puts Object.const_get("Inc").say(subject)

A simpler solution is just to iterate over all the modules within an 
enclosing module/namespace:

==> inc1.rb <==
module Extensions
  module Inc1
    def self.say(subject)
      "Hello #{subject}"
    end
  end
end

==> inc2.rb <==
module Extensions
  module Inc2
    def self.say(subject)
      "Goodbye #{subject}"
    end
  end
end

==> main.rb <==
Dir["inc*.rb"].each { |src| load src }
Extensions.constants.each do |k|
  puts Extensions.const_get(k).say("world")
end

Aside: if you strip off the .rb extension (look at File.basename) then 
you can use 'require' instead of 'load'. This prevents loading the same 
file multiple times.
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