Wrapped Modules

[Austin Ziegler]

Last night, I was asked about loading objects into a namespace.
Thinking about it, I came up with this:

module Kernel
def require_wrap(resource, mod)
old_lf = $LOADED_FEATURES.dup
topconst = Module.constants
res = require resource

(Module.constants - topconst).each do |const|
mod.__send__const_set, const,
Object.__send__remove_const, const))
end

$LOADED_FEATURES.replace(old_lf)
ensure
res
end
end

module My; end
module Your; end
require_wrap 'cgi', My
require_wrap 'cgi', Your

puts My::CGI.escape("hello, world")
puts Your::CGI.escape("hello, world")

I don't know if this is useful -- and it has a few drawbacks. First,
I have no clue whether it will work with deep nesting and
references. Second, it won't work on modifications to already
existing classes. Third, the class name is reported as if it were at
the top level.

The better choice to solve the third is to do what Jim Weirich
suggested: read the file as a string and module_eval it.

But I throw this out for discussion in any case.

-austin