From: Matthew Hailstone <matthew.hailstone@...>
Date: 2007-01-12T06:03:53+09:00
Subject: Re: Finding path to ruby script argument

helloworld.rb:
------------------------------
puts $0
puts __FILE__
puts File.dirname($0)
puts ARGV[0]
puts File.expand_path(__FILE__)
puts File.expand_path($0)

require 'includeme.rb'

tempvar = IncludeMe.new
tempvar.runme
------------------------------

includeme.rb:
------------------------------
class IncludeMe
  def runme
    puts "includeme.rb"
    puts __FILE__
    puts $0
    puts "end includeme.rb"
  end
end
------------------------------

command:
------------------------------
ruby helloworld.rb onlyarg
------------------------------

output:
------------------------------
helloworld.rb
helloworld.rb
.
onlyarg
C:/scripts/helloworld.rb
C:/scripts/helloworld.rb
includeme.rb
./includeme.rb
helloworld.rb
end includeme.rb

------------------------------

Looks like out of the originally invoked rb script, the whole path is
lost. I would have to assign the value to a global variable if I
needed to preserve it to all scripts.

Matthew

On 1/11/07, Philip Hallstrom <ruby@philip.pjkh.com> wrote:
> > On 1/11/07, Matthew Hailstone <matthew.hailstone@gmail.com> wrote:
> >> Looks like __FILE__ and $0 are the same.
> >
> > Not necessarily... when running a script under rcov or similar, they
> > may differ (for example one starts with ./ while the other does not).
> > That's why I write the if __FILE__ == $0 idiom as
> >
> > if File.expand_path(__FILE__) == File.expand_path($0)
> >
> > Another possibility might be is when you start the script using $PATH,
> > i.e. not from current directory, but without specifying its path.
>
> Also, and i haven't even bothered to test this, but if it's similar to
> PHP's FILE variable, it's the *current* file... so require a file, call a
> method in that file, and access __FILE__ in that method and you're gonna
> get your required file, not the initial one...
>
> -philip
>
>