rebase: add --allow-empty-message option
This option allows commits with empty commit messages to be rebased, matching the same option in git-commit and git-cherry-pick. While empty log messages are frowned upon, sometimes one finds them in older repositories (e.g. translated from another VCS [0]), or have other reasons for desiring them. The option is available in git-commit and git-cherry-pick, so it is natural to make other git tools play nicely with them. Adding this as an option allows the default to be "give the user a chance to fix", while not interrupting the user's workflow otherwise [1]. [0]: https://stackoverflow.com/q/8542304 [1]: https://public-inbox.org/git/7vd33afqjh.fsf@alter.siamese.dyndns.org/ To implement this, add a new --allow-empty-message flag. Then propagate it to all calls of 'git commit', 'git cherry-pick', and 'git rebase--helper' within the rebase scripts. Signed-off-by: Genki Sky <sky@genki.is> Reviewed-by: Johannes Schindelin <Johannes.Schindelin@gmx.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Junio C Hamano

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@ -244,6 +244,11 @@ leave out at most one of A and B, in which case it defaults to HEAD.
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Keep the commits that do not change anything from its
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parents in the result.
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--allow-empty-message::
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By default, rebasing commits with an empty message will fail.
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This option overrides that behavior, allowing commits with empty
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messages to be rebased.
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--skip::
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Restart the rebasing process by skipping the current patch.
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