From: sowieso@...
Date: 2014-10-06T12:49:51+00:00
Subject: [ruby-core:65439] [ruby-trunk - Feature #10320] require into module

Issue #10320 has been updated by So Wieso.


I chose the symbol `:Lib`, as I thought Ruby would complain if the constant `Lib` would not exist at this time. The keyword `in` would define it, if it would not exist. I would prefer if we could solve it without using symbols, but writing `module Lib; end` before the first require doesn't look nice.

Sorry, I didn't consider that `require` is a method, so I guess the keyword option (`in`) doesn't fit.
( Alternatively we could define suffix `in` as enclosing the given module:

~~~ruby
require 'file' in Lib
# is equivalent
module Lib
  require 'file'
end
~~~

but then require has to check for its nesting.
)

----------------------------------------
Feature #10320: require into module
https://bugs.ruby-lang.org/issues/10320#change-49224

* Author: So Wieso
* Status: Open
* Priority: Normal
* Assignee: 
* Category: core
* Target version: 
----------------------------------------
When requiring a library, global namespace always gets polluted, at least with one module name. So when requiring a gem with many dependencies, at least one constant enters global namespace per dependency, which can easily get out of hand (especially when gems are not enclosed in a module).

Would it be possible to extend require (and load, require_relative) to put all content into a custom module and not into global namespace?

Syntax ideas:

~~~ruby
require 'libfile', into: :Lib   # keyword-argument
require 'libfile' in Lib   # with keyword, also defining a module Lib at current binding (unless defined? Lib)
require_qualified 'libfile', :Lib
~~~

This would also make including code into libraries much easier, as it is well scoped.

~~~ruby
module MyGem
����require 'needed' in Need

����def do_something
��������Need::important.process!
����end
end
 # library user is never concerned over needed's content
~~~

Some problems to discuss:

* requiring into two different modules means loading the file twice?
* monkeypatching libraries should only affect the module ����� auto refinements?
* maybe also allow a binding as argument, not only a module?
* privately require, so that required constants and methods are not accessible from the outside of a module (seems to difficult)
* what about $global constants, read them from global scope but copy-write them only to local scope?

Similar issue:
https://bugs.ruby-lang.org/issues/5643



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