From: ara.t.howard@...
Date: 2006-03-27T02:56:17+09:00
Subject: Re: String to array as command line

On Mon, 27 Mar 2006, lubos wrote:

> I have found the problem:
> the correct version is :
>
> def command_line string
>     Marshal::load(IO::popen("ruby -r yaml -e' print
> Marshal::dump(ARGV) ' -- #{ string }"){|io| io.read})
>   end
>
> the problem was that I put the "-v" parameter in the string and it was
> used by ruby itself and thus destroyed the marshaled stream...
> the added  "--" parametr avoid this behavior.
>
> Thanks, this is exactly what I was looking for..

ah - yes - good catch.  i guess it goes without saying that this is somewhat
expensive... but it should be portable.  about the only other thing would be
to dynamically determine which ruby to run instead of relying on the PATH
setting

   require "yaml"
   require "rbconfig"

   def command_line string
     cline = lambda{|ruby| Marshal::load(IO::popen("#{ ruby } -r yaml -e' print Marshal::dump(ARGV) ' -- #{ string }"){|io| io.read}) }
     c = ::Config::CONFIG
     ruby = File::join(c["bindir"], c["ruby_install_name"]) << c["EXEEXT"]
     begin
       cline[ruby] # don't depend on PATH
     rescue
       cline["ruby"] # depend on PATH as fallback
     end
   end


regards.

-a
-- 
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