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Re: nnimap-split-download-body removed?

From: Eric Abrahamsen
Subject: Re: nnimap-split-download-body removed?
Date: Mon, 30 Nov 2020 09:10:05 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux)

Bodertz <> writes:

> I wrote a function which can do something useful with the body of an
> email.  If worse comes to worse, I can run this function manually after
> opening the email, but my plan was to use splitting to automate this.
> As documented in "(gnus)Fancy Mail Splitting", splitting based on the
> content of the email can be done with nnimap by setting
> 'nnimap-split-download-body' to 't'.  See the last sentence:
>   (: FUNCTION ARG1 ARG2 ...)’
>       If the split is a list, and the first element is ‘:’, then the
>       second element will be called as a function with ARGS given as
>       arguments.  The function should return a SPLIT.
>       For instance, the following function could be used to split based
>       on the body of the messages:
>            (defun split-on-body ()
>              (save-excursion
>                (save-restriction
>                  (widen)
>                  (goto-char (point-min))
>                  (when (re-search-forward "Some.*string" nil t)
>                    ""))))
>       The buffer is narrowed to the header of the message in question
>       when FUNCTION is run.  That’s why ‘(widen)’ needs to be called
>       after ‘save-excursion’ and ‘save-restriction’ in the example above.
>       Also note that with the nnimap backend, message bodies will not be
>       downloaded by default.  You need to set
>       ‘nnimap-split-download-body’ to ‘t’ to do that (*note Client-Side
>       IMAP Splitting).
> However, this did not seem to work, although I haven't tested
> thouroughly.  Looking through the git history of Emacs, it seems that
> 'nnimap-split-download-body' was removed a little over ten years ago.
> An internal variable, 'nnimap-split-download-body-default' is still
> present, but is as far as I can tell unused.

I tried looking through the history, too, and that was pretty confusing.
It looks like the manual section talking about
`nnimap-split-download-body' was added *after* the actual defcustom was
removed. I suspect that's an artifact of git history merge, but the
current situation is still odd (the manual still refers to

It looks like `nnimap-split-download-body-default' is in fact still
used, in `nnimap-fetch-inbox', and setting it to t looks like it should
work. Give that a shot?

No matter what, there's a mismatch between code and documentation. And
if split-download-body-default still has effect, then it should be a
defcustom, too. I don't see why there were two separate variables to
begin with.

Anyway, let me know if setting that variable to t works.


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