bug#57400: 29.0.50; Support sending patches from VC directly

[Philip Kaludercic <philipk@posteo.net>]

Eli Zaretskii <eliz@gnu.org> writes:

>> From: Philip Kaludercic <philipk@posteo.net>
>> Cc: larsi@gnus.org,  57400@debbugs.gnu.org,  ane@iki.fi
>> Date: Tue, 04 Oct 2022 07:10:15 +0000
>> 
>> Eli Zaretskii <eliz@gnu.org> writes:
>> 
>> >> +            (compose-mail addressee
>> >> +                          (or (plist-get patch :subject)
>> >> +                              (concat
>> >> +                               "Patch for " ;guess
>> >> +                               (file-name-nondirectory
>> >> +                                (directory-file-name
>> >> +                                 (vc-root-dir)))))
>> >> +                          nil nil nil nil
>> >> +                          `((exit-recursive-edit)))
>> >> +            (message-goto-body)
>> >
>> > compose-mail doesn't necessarily invoke message.el functions, so
>> > message-goto-body is not necessarily appropriate here.
>> 
>> Oh, I thought it was because `submit-emacs-patch' did the same.  Again,
>> do you have any suggestions what else could be done to keep this
>> generic?
>
> Can you ask more specific questions?  Are you looking for a generic
> way of doing what message-goto-body does?  

Kind of, I would like to have some function that would place the point
at the beginning of the message body, no matter what MUA is used.  From
what I see, the implicit assumption always is that a message is composed
in a single buffer where the headers are written out at the beginning of
the buffer, then there is some kind of to detect the end of the headers,
followed by the body.  But what if a MUA wants to use a separate buffer
for the headers and the body, placing them in two separate windows?
What if the headers aren't shown at all?  If I want to handle the
situation generically, it seems like I would have to take all the design
decisions into consideration.

>                                            If so, would
> rfc822-goto-eoh do the job?

It doesn't seem to do the same, as in message-mode, it jumps to the
beginning of the "--text follows this line--" line, not to the line
after it.