gistfile1.builder

module RequireTree
  @@require_tree = {:system => $".dup}
  
  def require(string)
    @current = $".dup
    result = super(string)
    @@require_tree[string] = $" - @current
    result
  end
  
  def reload(matcher)
    if matcher.is_a? String
      paths = @@require_tree[matcher]
      keys = [matcher]
    elsif matcher.is_a? Regexp
      keys = @@require_tree.keys.select{ |k| k =~ matcher}
      paths = keys.map{ |k| @@require_tree[k] }.flatten
    else
      raise ArgumentError
    end

    paths.each{ |p| $".delete(p) }
    keys.map{ |k| [k, (require k)] }
  end
  
  def self.file_tree
    @@require_tree
  end
end

include RequireTree