From: Gordon Hartley <gordonhartley@...>
Date: 2005-03-21T07:04:51+09:00
Subject: Dynamically requiring files - scoping issues

Hi,

Given the source and output below, it should be fairly obvious what
I'm trying to do (doing code generation / automation stuff.)

Page 124 of Pickaxe (2nd Ed.) mentions that variables are not
propogated to the scope that loads/requires them, so is there any way
of referring to / accessing them? 

I've resolved it as per main2.rb excerpt below, but was wondering
whether there is a 'cleaner' (free or minimal eval()) solution?

Contrived example below, which results in:
Got to here in one.rb
Got to here in two.rb
undefined local variable or method `one' for main:Object (NameError)

Thanks,
Gordon

### dynamic/one.rb ###
one = Needed.new("1")
puts "Got to here in one.rb"

### dynamic/two.rb ###
two = Needed.new("2")
puts "Got to here in two.rb"

### needed/needed.rb ###
class Needed
  attr_accessor :test
  def initialize(test)
    @test = test
  end
end

class DoStuff
  def DoStuff.go(needed_array)
    needed_array.each do |needed| 
      # do stuff with needed.....
    end
  end
end

### main.rb ###
require 'needed/needed'

container = []

Dir["dynamic/*.rb"].each do |file_name|
    require "#{file_name[0..-4]}"
end

Dir.chdir("./dynamic")

Dir["*.rb"].each do |file_name|
  eval("container << #{file_name[0..-4]}")
end

DoStuff.go(container)

### main2.rb excerpt, not part of example ###

Dir["*.rb"].each do |file_name|
  eval_me = File.open(file_name).readlines.to_s
  eval(eval_me) 
  eval("container << " + file_name[0..-4].to_s)
end