From: Matthew Moss <matthew.moss@...>
Date: 2008-09-01T12:26:36+09:00
Subject: Re: Where the Required Things Are (#175)

Here is Rolando's solution:



module Kernel
  alias kernel_original_require require

  FILE_EXTENSIONS = [".so", ".bundle", ".dll"]

  def check_require2(lib, path)
    $_req_disp_table ||= {}
    if File.file?(path)
      if $_req_disp_table[lib].nil?
        puts "  require '#{lib}' => #{path}"
        $_req_disp_table[lib] = 1
      end
      return true
    else
      return false
    end
  end

  def check_require(lib, path)
    if (ext = File.extname(path)).empty? || ext == ".rb"
      # puts ">>> #{path} does not have an extension"
      ext = ".rb"
      [".rb"].concat FILE_EXTENSIONS
    else
      # puts ">>> #{path} has extension"
      FILE_EXTENSIONS
    end.each { |_ext|
      res = check_require2(lib, File.join(File.dirname(path),
File.basename(path, ext) + _ext))
      return res if res
    }
    return false
  end

  def require(lib)
    # puts ">>> requiring #{lib} (#{$_req_top})
(#{$_req_table.inspect})"
    $_req_top ||= lib
    if (ENV['REQUIRE_SHOW_ALL'].nil? && lib == $_req_top) ||
ENV['REQUIRE_SHOW_ALL']
      got_it = false
      $:.each { |d|
        fpath = File.join(d, lib)
        got_it = check_require(lib, fpath)
        break if got_it
      }
    end
    if (res = kernel_original_require(lib)) && got_it
      $_req_top = nil
    end
    res
  end
end

if __FILE__ == $0
  ARGV.each { |m| require m }
end