Rubén Justo f96c385449 format-patch: assume --cover-letter for diff in multi-patch series ...

When we deal with a multi-patch series in git-format-patch(1), if we see
`--interdiff` or `--range-diff` but no `--cover-letter`, we return with
an error, saying:

    fatal: --range-diff requires --cover-letter or single patch

or:

    fatal: --interdiff requires --cover-letter or single patch

This makes sense because the cover-letter is where we place the diff
from the previous version.

However, considering that `format-patch` generates a multi-patch as
needed, let's adopt a similar "cover as necessary" approach when using
`--interdiff` or `--range-diff`.

Therefore, relax the requirement for an explicit `--cover-letter` in a
multi-patch series when the user says `--iterdiff` or `--range-diff`.

Still, if only to return the error, respect "format.coverLetter=no" and
`--no-cover-letter`.

Signed-off-by: Rubén Justo <rjusto@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

2024-06-07 14:02:13 -07:00

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