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Date: Sat, 16 Nov 2019 12:52:51 -0500
From: Konstantin Ryabitsev <konstantin@linuxfoundation.org>
To: meta@public-inbox.org
Subject: Filter example for ML footers
Message-ID: <20191116175251.ykhpp6zuo5f6kqiy@chatter.i7.local>
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Hello:

Groups.io adds a super-obnoxious footer to all outgoing messages, and I 
would like to be able to filter that out. Example:

https://lore.kernel.org/keys/20191111161300.hc7vb7rcb45gsqmg@chatter.i7.local/

The obnoxious footer can be either part of the main body (default
"chaotic evil" version) or a separate mime-part (configurable, "lawful 
evil").

I tried to wrap my brain around existing filters, but they don't quite 
do the exact thing I need, specifically:

- if there is a text/plain mime-part with just "^-=-=.*=-=-$", remove it
- if there is no more content left after removing the footer, nuke the 
  entire mime-part

Any quick pointers how this can be accomplished? 

TIA.

-K