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From: ShengHuo ZHU <zsh@cs.rochester.edu>
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Subject: Re: Postprocessing / custom attributes on MML parts
Date: Fri, 27 Jul 2001 09:52:08 -0700
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Nuutti Kotivuori <nuutti.kotivuori@smarttrust.com> writes:

> ShengHuo ZHU wrote:
>>> Hope you get my point.
>> 
>> Give me a good example about your custom processing.
> 
> Well, a simple one:
> 
> <#part type="text/plain" disposition=inline postprocess=ispell>
> 
> Ispell _this part only_ before sending. The same thing one would do
> message-send-hook, but only for a specific part. And also that you
> wouldn't have to do it always, but you could specify it by hand for
> parts that you want checked.

Actually, ispell should not be put here. mml-generate-mime will be
called more than once if there is "Gcc:" head or so.  Beside,
post-processing was called on the buffer containing generated mime,
therefore, the content could be some encoded text. You should still
use message-send-hook and find the certain part.

> Other things I'd want it for would be format=flowed generation through
> the distinction between hard and soft newlines or other things. Then
> more complex things would be to have for example a text/enriched part
> that would be translated to both a text/enriched part and a text/plain
> part is multipart/alternative, but that might be outside the scope of
> such a simple post-processing function.

This is reasonable, but not an example for post-processing because of
the same reason stated above.  Anyway, I've added mml-tweak-type-alist
and mml-tweak-function-alist for this purpose. For example:

<#part type="text/plain" disposition=inline tweak=my-enrich-part>

and define a function my-enrich-part.  

This part of code is not tested. If you found bugs, please report them.

ShengHuo