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From: Harry Putnam <reader@newsguy.com>
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Subject: Re: expiry-target as function, how about an example
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In-Reply-To: <m37kr5pvxv.fsf@quimbies.gnus.org> (Lars Magne Ingebrigtsen's
 message of "Sat, 29 Dec 2001 22:18:04 +0100")
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Lars Magne Ingebrigtsen <larsi@gnus.org> writes:

> Harry Putnam <reader@newsguy.com> writes:
>
>> The nearest thing to an example of expiry-target used as a funtion is
>> the description of it in the manual:
>
> [...]
>
>> o    Here's an example for specifying a group name:
>> o      (setq nnmail-expiry-target "nnml:expired")
>
> [...]
>
>> How can I slip a homemade function in here that processes the message
>> being expired? Something like this:
>>
>> (defun hp-process-exp ()
>>    "Run procmail/formail against this message" 
>>    (interactive)
>>    (shell-command "process_exp.ksh < THIS_BUFFER" nil nil))
>
> (setq nnmail-expiry-target 'hp-process-exp)

Here we go in nitwit mode...  Do you mean something as simple as:

cat process_exp.ksh
   #!/bin/ksh
   
   if grep '^From:.*larsi@' >/dev/null;then
      echo "sacred_keepers"
   fi

Or does the name have to wear more adorment like "nnml:sacred_keepers"

If this is all it takes then a semi-complex case statement could pick
from almost any number of targets.  Oh.. is "/dev/null" amongst the
legitimate stings to return?

Do the groups have to exist?

Hoping to clear up some things before spending too much time experimenting.