[PATCH v6 0/3] am: support --empty=(die|drop|keep) 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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Aleen (3):
  doc: git-format-patch: describe the option --always
  am: support --empty option to handle empty patches
  am: throw an error when passing --empty option without value

 Documentation/git-am.txt           |  9 ++++
 Documentation/git-format-patch.txt |  6 ++-
 builtin/am.c                       | 49 ++++++++++++++++--
 t/t4150-am.sh                      | 79 ++++++++++++++++++++++++++++++
 4 files changed, 137 insertions(+), 6 deletions(-)


base-commit: b550198c73edd4cc058832dcf74b41aeec2adba2
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-1076%2Faleen42%2Fnext-v6
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-1076/aleen42/next-v6
Pull-Request: https://github.com/gitgitgadget/git/pull/1076

Range-diff vs v5:

 1:  9f1b3dd6d0b = 1:  9f1b3dd6d0b doc: git-format-patch: describe the option --always
 2:  96d8573dc80 = 2:  96d8573dc80 am: support --empty option to handle empty patches
 -:  ----------- > 3:  e907a2b2faa am: throw an error when passing --empty option without value

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