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Re: [Nmh-workers] Sequences in scan

From: Ken Hornstein
Subject: Re: [Nmh-workers] Sequences in scan
Date: Thu, 09 Mar 2017 21:07:49 -0500

>Is there anyway to check if a message is in a specific sequence for the scan
>output. I can check `unseen` and `cur`, would be nice if I could do something
>like this in my scan format file:
>    %<(seq{my-seq}) ! %|   %>

"unseen" is sort of special; it is a defined sequence and plenty of
tools already have special handling for it.  The way %(unseen) works
is that the caller of the mh-format function has to figure out if the
message is on the unseen sequence and set the appropriate value in the
"dat" array (don't ask). %(cur) is handled in a similar way, but again
is another integer.

Making this work for arbitrary sequences isn't IMPOSSIBLE, but would
require another way to pass data from the compiled format program (to
know what sequences you're interested in) up to where the messages are
parsed, and then back to the format interpreter during execution.  This
is doable, but I don't know what it would look like.  That's another way
of saying, "It's more code than I personally want to do right now".


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