With "-o -" write mbox with no cover to stdout.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

b4 pr cannot auto-discover merge-base on a merged pull request.
In order to explode a merged PR into patches mbox, provide the
msgid of the PR tracker reply, which contains the merge commit id.

Don't try to read msgid's from stdin if provided as argument.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

With add_message(..., needcover=True) try harder to find the
cover letter of the message by looking at in-reply-to.

Regardless of needcover, always accept cover letter with numbering
0/N but without diffstat, like this one:

https://lore.kernel.org/all/20220317053907.164160-1-david@fromorbit.com/

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

nocache was not passed into get_extra_series() by callers and
wantvers was passed in as wrong type.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

With get_extra_series([], base_msg=base_msg, direction=0, ...),
get the latest revision of series from public-inbox with a match to
base_msg subject.

This will be used when base_msg refer to a patch in a local mbox where
neither the revision nor the date nor author of the local patch is
relevant for the search.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

When query starts with an empty msgs list, try to use cached results
from previous query of the same base_msg.

When base_msg is a git am formatted message without a message id use
commit id as cache key.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

Associate patches in patch queue to patch series and for every patch
series provide a lore link to latest revision.

Can be used to produce release notes draft to add to a pull request:

  git format-patch <revision range> --stdout | b4 rn -m -

To produce release notes before merging a pull request:

  b4 pr -e -o - <PR msgid> | b4 rn -m -

And to produce release notes from a merged pull request:

  b4 pr -e -o - <PR tracker reply msgid> | b4 rn -m -

See tests/linux_rn.sh for examples.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

If output file suffux is .rst, generate release notes in reStructuredText
format.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

If any of the messages in the series has references a fstests
test name, print the tests in release notes.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>

When a patch is found in PR whose subject is not found in
public inbox, list the patch is release notes as:

- [PATCH ?/?] ...

Because we do not know if it is part of a patch series
and we have no link to public inbox.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>