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bug#38011: 27.0.50; [PATCH] WIP on allowing Gnus backends to return head
From: |
Lars Ingebrigtsen |
Subject: |
bug#38011: 27.0.50; [PATCH] WIP on allowing Gnus backends to return header data directly |
Date: |
Sun, 27 Sep 2020 14:16:16 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (gnu/linux) |
Eric Abrahamsen <eric@ericabrahamsen.net> writes:
>> Xref: reader01.eternal-september.org foo.bar:2523 gnu.emacs.help:57603
>> zot.bar:3242
[...]
> Slowly, slowly, I'm getting this done. I'm still a bit confused here,
> though. The xref elements look like they're not supposed to have spaces
> in them, but the existing code does this:
>
> (insert "Xref: " sysname " " group ":")
> (princ article (current-buffer))
>
> Which leaves a space between sysname and group.
I'm not quite sure I understand the question? The sysname is just a
part of the syntax of the Xref header and isn't used for anything by
Gnus, as far as I know. So there has to be a space? It's certainly not
part of the group name.
> You say the existing xrefs should be left as they are, but the code adds
> "prefix" to them. Should this be added unconditionally?
Uhm... I think so? But I'm not sure.
> Here's the new version of the function, operating on a header struct.
> Does this look right to you?
>
> Thanks,
> Eric
>
> (defun nnvirtual-update-xref-header (header group prefix sysname)
> "Add xref to component GROUP to HEADER.
> Also add a server PREFIX any existing xref lines."
> (let ((bits (split-string (mail-header-xref header)
> nil t "[[:blank:]]"))
> (art-no (mail-header-number header)))
> (setq bits
> (mapcar (lambda (bit)
> (concat prefix bit))
> bits))
> (setf (mail-header-xref header)
> (mapconcat #'identity
> (cons (format "%s %s:%d"
> sysname group art-no)
> bits)
> " "))))
I think so. The body of the let form is perhaps more easily expressed
as
(setf (mail-header-xref header)
(concat (format "%s %s:%d " sysname group art-no)
(mapconcat (lambda (bit)
(concat prefix bit))
bits " ")))
?
--
(domestic pets only, the antidote for overdose, milk.)
bloggy blog: http://lars.ingebrigtsen.no