From: Gavin Kistner <gavin@...>
Date: 2004-10-19T11:32:59+09:00
Subject: Re: Relative #require

On Oct 18, 2004, at 8:32 AM, trans. (T. Onoma) wrote:
>   module Kernel
>     # Require files from same dir as running script.
>     def import(*args)
>       fd = File.dirname(caller[0])
>       args.each do |file_name|
>         require File.join(fd, file_name)
>       end
>     end
>   end

Thanks for passing this along, although it doesn't work. caller[0] is 
neither a path, nor the path to the 'current' file. (The one I supplied 
is even worse, as __FILE__ doesn't change at all.) From my test 
(below), caller[2] seems like it would be usable (with some regexp 
massaging) but that feels like a hack which will break under some odd 
circumstance. Perhaps someone more clever than I can figure out a 
clean, robust way to do this.

~/Desktop/tmp.rb
~/Desktop/libs/lib1.rb
~/Desktop/libs/lib2.rb
~/Desktop/libs/sublib/lib3.rb


% cat tmp.rb
module Kernel
	require 'pathname'
	def import( *paths )
		paths.each{ |path|
			puts path,caller.join("\n"),' '
		}
	end
end

import 'Go find "./libs/lib1.rb" given "libs/lib1.rb"'
require 'libs/lib1.rb'


% cat libs/lib1.rb
1.times{
	import 'Go find "./libs/lib2.rb" given "lib2.rb"'
	require 'libs/lib2.rb'
}


% cat libs/lib2.rb
class Bar
	class Jim
		import 'Go find "./libs/sublib/lib3.rb" given "sublib/lib3.rb"'
		require 'libs/sublib/lib3.rb'
	end
end


% cat libs/sublibs/libs3.rb
import 'Go find "./libs/sublib/lib4.rb given "lib4.rb"'


% ruby tmp.rb
Go find "./libs/lib1.rb" given "libs/lib1.rb"
/Users/gavinkistner/Desktop/tmp.rb:6:in `each'
/Users/gavinkistner/Desktop/tmp.rb:6:in `import'
/Users/gavinkistner/Desktop/tmp.rb:12

Go find "./libs/lib2.rb" given "lib2.rb"
/Users/gavinkistner/Desktop/tmp.rb:6:in `each'
/Users/gavinkistner/Desktop/tmp.rb:6:in `import'
./libs/lib1.rb:4
./libs/lib1.rb:3:in `times'
./libs/lib1.rb:3
/Users/gavinkistner/Desktop/tmp.rb:13:in `require'
/Users/gavinkistner/Desktop/tmp.rb:13

Go find "./libs/sublib/lib3.rb" given "sublib/lib3.rb"
/Users/gavinkistner/Desktop/tmp.rb:6:in `each'
/Users/gavinkistner/Desktop/tmp.rb:6:in `import'
./libs/lib2.rb:3
./libs/lib1.rb:5:in `require'
./libs/lib1.rb:5
./libs/lib1.rb:3:in `times'
./libs/lib1.rb:3
/Users/gavinkistner/Desktop/tmp.rb:13:in `require'
/Users/gavinkistner/Desktop/tmp.rb:13

Go find "./libs/sublib/lib4.rb given "lib4.rb"
/Users/gavinkistner/Desktop/tmp.rb:6:in `each'
/Users/gavinkistner/Desktop/tmp.rb:6:in `import'
./libs/sublib/lib3.rb:1
./libs/lib2.rb:4:in `require'
./libs/lib2.rb:4
./libs/lib1.rb:5:in `require'
./libs/lib1.rb:5
./libs/lib1.rb:3:in `times'
./libs/lib1.rb:3
/Users/gavinkistner/Desktop/tmp.rb:13:in `require'
/Users/gavinkistner/Desktop/tmp.rb:13