From: Robert Klemme <bob.news@...>
Date: 2005-06-06T19:30:25+09:00
Subject: Re: A Ruby script to add email disclaimers

Johann Spies wrote:
> A few years after my first contact with ruby (and not using it) I am
> like a newbie again.
>
> I want to use a ruby script to add a disclaimer to a message passed to
> it by exim.
>
> So far I can add a disclaimer to a message file by the following
> script:
> =============================
> #!/usr/bin/ruby
>
> require 'tmail'
>
> mail = TMail::Mail.load( ARGV[0])
>
> disklymer = "\n\nDit is 'n aangeplakte disklymer hierdie... :(  \n"
>
>   if not mail.key?("X-Disclaimer") then
>     mail.[]=("X-Disclaimer","added")
>     if mail.multipart? then
>       mail.preamble += disklymer
>
>     else
>       mail.body += disklymer
>     end
>   end
> puts mail.encoded
> ==============================
>
> But when exim calls the script the message is not saved in a temporary
> file.  The script should thus be able to handle a message passed to it
> like in the following command:
>
> cat <email-message> | disclaimerscript.rb
>
> I have experimented a little bit with "/usr/bin/ruby -n" and $_ but I
> did not have success.
>
> I would appreciate some help with this one please.

I'm not 100% sure about your use case.  If your script is invoked like
this:

add-disclaimer.rb mail-file

then you can use option "-i.bak" which does in place modification and
saves the original in a backup file (or leave the ".bak" in that case you
get just the modified file).

If you want to use it in a pipe context, I'd try

mail = TMail::Mail.load( ARGF )

or

mail = TMail::Mail.load( STDIN )

Dunno which of the two TMail can handle.  A quick glance at the sources
reveales that maybe you have to implement a sub class of Port to handle
reading from streams.

Kind regards

    robert