From: Brett Williams <brettandbecky@...>
Date: 2008-02-13T00:26:30+09:00
Subject: Ruby equivalent to source command

Hello all,

I am trying to make a "source" command for Ruby (a la sh or tcl), but I
think lexical scoping is tripping me up.  I've done a lot of reading
about bindings, and it seems I just can't do what I'm trying to do.

def source(filename, bind = TOPLEVEL_BINDING)
  code = nil
  File.open(filename) { |f| code = f.read }
  eval(code, bind)
end

This works as I would like, with the exception of local variables
present in the sourced file.  For example, if I had something like this
in the sourced file:

x = "value set in sourced file"

then I get an error :  undefined local variable or method 'x'

unless I extend the scope of x by setting it before sourcing the file.

Is there any way to accomplish what I want?  I could work around this by
sticking to instance variables or *gulp* global variables for this
application, but before I throw in the towel I wanted to throw this out
to people here.

Thanks,

Brett Williams



P.S.:  Things have changed since I was a pretty regular poster back in
2002-2003... ;)
-- 
Posted via http://www.ruby-forum.com/.