Question

When reading source code, I always want to know the full path of the file when it is loaded, is there any callback method in ruby to accomplish this, or any other way to do this? thanks in advance.

EDIT Clarification from the comments:

I want to know where the loaded ‘somefile’ is located while I execute this line: ‘load somefile’

Answer 1

The best way I can think of is to patch the Kernel module. According to the docs Kernel::load searches $: for the filename. We can do the same thing and print the path if we find it.

module Kernel   def load_and_print(string)     $:.each do |p|       if File.exists? File.join(p, string)         puts File.join(p, string)         break       end     end     load_original(string)   end    alias_method :load_original, :load   alias_method :load, :load_and_print  end 

We use alias_method to store the original load method, which we call at the end of ours.