From: greg weber <eegreg@...>
Date: 2006-11-27T10:55:14+09:00
Subject: Re: Truncating string set on $0

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Using a launcher will also break RDoc::Usage() in usage.rb because it
relies on the first position of caller().  This is also arguably a
bug.  I have patched this (attached) by adding an option to pass in a
file because this could be useful in other ways, but this could also
be fixed by properly examining caller().

-Greg Weber

On 11/26/06, Joao Pedrosa <joaopedrosa@gmail.com> wrote:
> Hi,
>
> I have a "pre-ruby-launcher", which loads some environment
> variables and launches the other script. That is, the first script
> is just temporary, while the second script is the final (main) one.
>
> To make it work transparently, I used to set the $0 variable to
> the filename of the second script, and everything, for months,
> ran smoothly. That is, until today. Today I noticed that a large
> filename string could be truncated, and it seems that the length
> depends on the initial command for launching Ruby.
>
> For example, running this script:
> s = 'a'
> 100.times{|n|
>   z = s * n
>   $0 = z
>   if z.size != $0.size
>     p n
>     exit
>   end
> }
>
> Prints:
> dewd@corvina:~/t_/tempo$ ruby first_file.rb
> 19
>
> It stops at the length of "ruby first_file.rb".
>
> Thankfully, despite this issue, things have worked ok
> until today.
>
> I'm not sure you want to fix this or whether this is
> could be considered a problem at all. I can circumvent
> this issue at least for my latest usage of this.
>
> Cheers,
> Joao
>
>

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