From: Alex Young <alex@...>
Date: 2007-07-31T06:42:42+09:00
Subject: Re: Passing variables to a required file

12 34 wrote:
> Alex Young wrote:
>> 12 34 wrote:
>>> Is there a better way? FWIW I'm "require'ing a modified example.rb file
>>> that is included in the Pashua app for creating a simple GUI for OS X.
>>> <http://www.bluem.net/downloads/pashua_en/>
>> Change your code.  It'll be easier to do it now than to unpick
>> everything later.
>>
>> What you want (probably) is to wrap your code in the require'd file into
>> a class that you can instantiate with the relevant parameters in your
>> main script.
>>
> 
> OK. For now that's the best solution for me, but later I will look at 
> putting in a separate file.
Well, the class definition can still be in the external file - that's 
actually what I meant.  You can do something like this:

main.rb:

require 'ui_code'

UICode.new(all, your, parameters).run

ui_code.rb:

class UICode
   def initialize(use, meaningful, parameter, names)
     @use = use
     @meaningful = meaningful
     # etc...
   end

   def run
     #your current code goes here, referring to instance variables rather
     # than globals
   end
end

That's a fairly typical arrangement, in fact.

>>> something in how it's used.
>> It's a heredoc marker.  It's just another way of creating a multiline
>> string.  The critical bit is the "<<EOS" start marker - after "<<" you
>> can put any identifier, and a string will be created from the content
>> between that line and the first occurrence of that marker on its own
>> later in the file.
> 
> Thank you Alex and  Thomas, now I see that a long string is being 
> prepared to send to the Perl script or something like that. And I'm 
> trying to get my Ruby variable in that string. They syntax in the string 
> didn't quite look like Ruby, missing quotes and things.
> 
> So EOS presumably means something like End of String and is commonly 
> used but has no special meaning to Ruby. Confusing also to me that the 
> word in front of <<EOS was "Config" which could be just a descriptive 
> name or word with a special meaning.
Nope, it's just a variable name.  Except that here it's a little weird - 
because it's capitalised, it's a constant.  Not sure if that's relevant, 
but don't worry about the specific name "Config" being anything special.

-- 
Alex