[PATCH v12 0/3] am: support --empty=(die|drop|keep) option and --allow-empty option to handle empty patches

Since that git has supported the --always option for the git-format-patch command to create a patch with an empty commit message, git-am should support applying and committing with empty patches.

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Changes since v1:

 1. add a case when not passing the --always option.
 2. rename the --always option to --allow-empty.

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Changes since v2:

 1. rename the --allow-empty option to --empty-commit.
 2. introduce three different strategies (die|skip|asis) when trying to
    record empty patches as empty commits.

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Changes since v3:

 1. generate the missed file for test cases.
 2. grep -f cannot be used under Mac OS.

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Changes since v4:

 1. rename the --empty-commit option to --empty.
 2. rename three different strategies (die|skip|asis) to die, drop and keep
    correspondingly.

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Changes since v5:

 1. throw an error when passing --empty option without value.

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Changes since v6:

 1. add i18n resources.

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Changes since v7:

 1. update code according to the seen branch.
 2. fix the wrong document of git-am.
 3. sign off commits by a real name.

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Changes since v8:

 1. update the committer's name with my real name to fix DCO of GGG.

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Changes since v9:

 1. imitate the signed name format of
    https://lore.kernel.org/git/pull.1143.git.git.1637347813367.gitgitgadget@gmail.com
    .

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Changes since v11:

 1. introduce an interactive option --allow-empty for git-am to record empty
    patches in the middle of an am session.

徐沛文 (Aleen) (3):
  doc: git-format-patch: describe the option --always
  am: support --empty=<option> to handle empty patches
  am: support --allow-empty to record specific empty patches

 Documentation/git-am.txt           | 14 +++++-
 Documentation/git-format-patch.txt |  6 ++-
 builtin/am.c                       | 77 ++++++++++++++++++++++++++----
 t/t4150-am.sh                      | 61 +++++++++++++++++++++++
 t/t7512-status-help.sh             |  1 +
 wt-status.c                        |  3 ++
 6 files changed, 151 insertions(+), 11 deletions(-)

base-commit: abe6bb3905392d5eb6b01fa6e54d7e784e0522aa
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1076%2Faleen42%2Fnext-v12
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1076/aleen42/next-v12
Pull-Request: https://github.com/gitgitgadget/git/pull/1076

Range-diff vs v11:

 1:  3d7e96ce2b3 = 1:  a524ca6adfa doc: git-format-patch: describe the option --always
 2:  6051ad9440a = 2:  a3e850bab7d am: support --empty=<option> to handle empty patches
 -:  ----------- > 3:  d44dac09c87 am: support --allow-empty to record specific empty patches