From: sabbyxtabby@... (Sabby and Tabby)
Date: 2003-03-10T19:44:14+09:00
Subject: Re: $0 == false ??

Tim Bates <tim@bates.id.au> wrote in message news:<200303092049.04170.tim@bates.id.au>...
> On Sun, 9 Mar 2003 6:29 pm, Tim Bates wrote:
> > Without $0, how can I retrieve the name of the currently running script
> > from within a require'd file? (ie, __FILE__ won't work...) Example:
> 
> Okay, it seems I can use Apache.request.filename instead, but I'm still 
> curious about the clobbering of $0.

You can also use 'caller' in the require'd file:

  # b.rb
  puts caller[0][/[^:]+/]

As for why $0 gets clobbered, someone with *any* mod_ruby experience
will have a better answer, but here are some guesses:

  1. All scripts in mod_ruby are run under the same process
     as the Apache server?
  2. All scripts share the same global variables?
  3. Instead of returning $0 == 'foo.rb' for all scripts,
     mod_ruby punts?

Again, all guesses.  Would it be possible for mod_ruby to set $0 to
Apache.request.filename just before running a script?

BTW, how does mod_ruby set $0 to false?

  $0 = nil  # ...failed to convert nil into String (TypeError)

And, an off-topic challenge:  anyone know how to get $0 to return the
current time?

  puts $0    # Mon Mar 10 02:21:26 PST 2003
  sleep 10
  puts $0    # Mon Mar 10 02:21:36 PST 2003

-- 
Tabby