From: "Mauricio Fernández" <batsman.geo@...>
Date: 2003-02-20T01:59:02+09:00
Subject: Re: Sourcing files

On Thu, Feb 20, 2003 at 12:41:03AM +0900, Brian Candler wrote:
> You'd think there would be a more Rubyesque way of doing this. I thought
> about an object which represents your configuration information:
> 
>  # main.rb
>  class Config
>    attr_accessor :x,:y,:z
>  end
>  conf = Config.new
>  conf.instance_eval { load 'config.rb' }   # no
>  puts conf.x
> 
>  # config.rb
>  self.x = 23
> 
> But 'load' doesn't work in that way inside instance_eval, since it seems to
> reset the context to the object 'main'
> 

Using instance_eval is a good idea IMHO:

batsman@tux-chan:/tmp$ expand -t 2 h.rb
class Config
  attr_accessor :x, :y, :z
end

USEFILE = false

conf = Config.new
conftext = case USEFILE
when true
  File.open("./config.rb") { |f| f.read }
when false
  'self.x = 1; self.y = 2; self.z = "test" '
end
conf.instance_eval conftext
conf.instance_variables.each do |f|
  puts "#{f} => #{conf.instance_eval(f).inspect} "
end
batsman@tux-chan:/tmp$ ruby h.rb
@z => "test"
@y => 2
@x => 1

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