From: Sai Hl <cyril.wack@...>
Date: 2009-02-17T03:38:41+09:00
Subject: Re: load a Ruby source with params

Brian Candler wrote:
> (1) Loading in more Ruby code to the currently-running Ruby interpreter.
> This is done using "load" or "require". There is no concept of
> "parameters" here. However you could set a global variable (e.g. $foo)
> or a constant (Foo), which the code in the other file makes use of.
> 
> But it would be more normal for the other file just to define modules or
> classes, and then after the load has completed you invoke one of those
> modules or classes, at which point you can pass whatever parameters you
> like.
> 
> (2) Forking and execing a new child process. This could be another
> Ruby interpreter, but it could also be any other program on your system.
> When you do this, you can pass command-line arguments (and/or
> environment variables and open files)
> 
> The simplest way is with Kernel#system, e.g.
> 
>     system("/bin/prog","arg1","arg2")
> 
> but other options include backticks, IO.popen, the open3 and open4
> libraries, and the low-level Kernel#fork and Kernel#exec calls.

Many thanks for your detailled answer, Brian Candler.

until now I used those few lines:

# inc.test.rb
'Hello ' + subject

# inc.other_test.rb
'Hi, ' + subject

# main.rb
@files = []
subject = 'World'
Dir['inc.*.rb'].each do |file|
  open(file) { |f| @files << f.read }
end
@files.each { |f| puts "#{eval(f)}" }

But it's true that the eval function takes a lot of ressources and the 
(1) solution is better, using global variables.

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)?

Regards
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