From: "ara.t.howard" <ara.t.howard@...>
Date: 2008-09-23T04:54:02+09:00
Subject: Re: at_exit handler *except* for fatal runtime error


On Sep 22, 2008, at 12:36 PM, DMisener wrote:

>>>
>>>
> output=TentativeFile.new.open('temp.tmp','w')
> output.puts 'Thanks'
>
> without an explict close doesn't automatically rename the file to its
> proper form.
>
> With "regular" File.open ... the file is automatically closed without
> need of explicit close. That was
> the behaviour I was trying to emulate.  I'm starting to think this
> "frill" is a lost cause.
>
>

you've got to play with code at least a little!


cfp:~ > cat a.rb
class TentativeFile < File
    Ext = 'tentative'

    def initialize path, *a, &b
      super "#{ path }.#{ Ext }", *a, &b
      at_exit{ close unless closed? } unless b
    end

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

output=TentativeFile.new('temp.tmp','w')
output.puts 'Thanks'


cfp:~ > ruby a.rb
closing temp.tmp.tentative...


cfp:~ > cat temp.tmp
Thanks





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