rev-parse --parseopt: option argument name hints
Built-in commands can specify names for option arguments when usage text is generated for a command. sh based commands should be able to do the same. Option argument name hint is any text that comes after [*=?!] after the argument name up to the first whitespace. Signed-off-by: NIlya Bobyr <ilya.bobyr@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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