From: Robert Klemme <shortcutter@...>
Date: 2009-05-16T22:45:04+09:00
Subject: Re: $0 is truncated

On 16.05.2009 15:03, Brian Candler wrote:
> If I assign a new value to $0, I find it is truncated.
> 
> $ cat test-dollar0.rb
> puts $0
> str = "/foo" * 20
> puts str.size
> $0 = str
> puts $0
> puts $0.size
> 
> $ ruby test-dollar0.rb
> test-dollar0.rb
> 80
> /foo/foo/foo/foo/foo
> 20
> 
> $ ln -s test-dollar0.rb td.rb
> $ ruby td.rb
> td.rb
> 80
> /foo/foo/f
> 10
> 
> In 1.8.6 I can get around this by $0.replace('....'), which sets $0 to
> any string I like. However this doesn't work in 1.8.7 or 1.9, because in
> those versions $0 is a frozen string.
> 
> Any suggestions for how to fix this? The application is that I want to
> start launcher program A, which in turn loads program B. Program B may
> be a Test::Unit test suite, and Test::Unit gets the test suite name from
> $0. So I either end up with the test suite having the name of program A
> (which is wrong), or a truncated version of program B's name (which is
> also wrong)

Modifying $0 seems a bit hackish to me.  Can't you just set the name 
explicitly?

Kind regards

	robert


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