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

[Robert Pluim]

>>>>> On Thu, 06 Oct 2022 12:38:25 +0000, Philip Kaludercic 
>>>>> <philipk@posteo.net> said:
    Philip> +(defcustom vc-prepare-patches-inline nil
    Philip> +  "Non-nil means that `vc-prepare-patch' creates a single
    Philip> message.
    >> 
    >> "Whether `vc-prepare-patch' attaches all revision in a single message."
    >> 
    >> Iʼm not sure this should have the suffix '-inline', because you can
    >> have inline attachments and attached attachments, but itʼs not a big
    >> deal.

    Philip> If you have a better name, there is no better time to change it 
than now.

`vc-prepare-patch-attach'? `vc-prepare-patch-attach-patches'? Itʼs all
a bit of a mouthful to type, and it doesnʼt feel like much of an
improvement over what you have.

    >> I also wonder about the default. Creating 100 mail buffers by accident
    >> is harder to recover from than a single one with 100 attachments, but
    >> I guess experience will inform us.

    Philip> The only case where this might happen by accident is when someone
    Philip> invokes `vc-prepare-patch' in a log-edit buffer where all (or at 
least a
    Philip> lot) of revisions have been marked.  In that case, one could add a
    Philip> "safely check" and make sure that the user actually wants to 
proceed.

That sounds sufficiently hard to achieve by accident that we
should leave it alone for now.

    Philip> +A single message is created by attaching all patches to the body
    Philip> +of a single message.  If nil, each patch will be sent out in a
    Philip> +separate message, which will be prepared sequentially."
    Philip> +  :type 'boolean
    Philip> +  :safe #'booleanp
    Philip> +  :version "29.1")
    Philip> +
    >> 
    >> (I didnʼt check, can this do the [PATCH n/m] stuff with the
    >> subject that 'git format-patch' can do?)

    Philip> Yes, as the Git backend just copies the subject name that
    Philip> git-format-patch generates.

Perfect

    Philip> As this is just the default value for `read-multiple-choice' a list 
with
    Philip> commae should do.  That being said, how common is it to have 
multiple
    Philip> people you consistently want to send a patch to?  Usually you'd 
have a
    Philip> central mailing list or something like that, I'd assume.

Right, and itʼs a string, so it caters for multiple addresses.

    >> ? What does `vc-prepare-patches-inline' have to do with the SUBJECT?

    Philip> Because the subject for an "inline patch" is extracted from the 
commit
    Philip> message.

Perhaps mention that in the docstring?

Anyway, I think Iʼve picked enough nits for this patch.

Robert
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