From: Jano Svitok <jan.svitok@...>
Date: 2007-07-03T06:03:29+09:00
Subject: Re: getting rid of $0

On 7/2/07, Michel Demazure <michel@demazure.com> wrote:
> The common idiom
>  if __FILE__ == $0 then ...
> gives bugs when $0 is not what one would expect, for instance under a
> debugger, or in rubyscript2exe, etc.
>
> There should be a primitive test
>    if <nice name to be found> then...

rcov provides for this case a special switch --replace-progname that
does what the name says. Unfortunately, sometimes there's still a
mismatch between those two:
one is ./something.rb while the other is just something.rb. Therefore
I use the following variation of the idiom (I haven't checked this
under debugger or any other prog):

if File.expand_path(__FILE__)==File.expand_path($0)

I have posted a patch for ruby-prof that adds a similar switch and it
has been accepted.

Anyway, $0 seems to be a normal variable that you can set to anything
you want, so creating a small wrapper script should not be a problem.
E.g.

$0 = ARGV.shift
require $0