From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-09-23T01:27:24+09:00
Subject: Re: at_exit handler *except* for fatal runtime error


On Sep 22, 2008, at 9:51 AM, DMisener wrote:

> Simple problem:
>
> Create a tentative output working file.  If the program exits
> "cleanly" then rename the work file
> to its "final" name.  If not leave the work file for possible
> examination.
>
> Ideally this File.open_tentative_output_file would be plug
> "compatible" with the simple File.open
> (i.e. support modes and blocks).

class TentativeFile
   Ext = 'tentative'

   def open path, *a, &b
     super "#{ path }.#{ Ext }", *a, &b
   end

   def close
      final = path.to_s.sub %r/[.]#{ Ext }$/, ''
      super
   ensure
     File.rename path, final unless $!
   end
end



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