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From:   Junio C Hamano <gitster@pobox.com>
To:     Jeff King <peff@peff.net>
Cc:     Philip Oakley <philipoakley@iee.email>,
        Daniel Knittl-Frank <knittl89@googlemail.com>,
        Git List <git@vger.kernel.org>
Subject: Re: Using two-dot range notation in `git rebase`?
References: <b3b5f044-8c76-ec71-45d6-1c7fea93c519@iee.email>
        <CACx-yZ1Je+tnZdJ21gDPeuQa-QTuY2t9mDujNr7wqJWFMwwzxA@mail.gmail.com>
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        <YQKBNXsMdroX3DfY@coredump.intra.peff.net>
Date:   Thu, 29 Jul 2021 10:13:59 -0700
In-Reply-To: <YQKBNXsMdroX3DfY@coredump.intra.peff.net> (Jeff King's message
        of "Thu, 29 Jul 2021 06:21:41 -0400")
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Jeff King <peff@peff.net> writes:

> long as there is only one negative tip given, that becomes the "--onto"
> point).

So "git newbase [--options] A..B" would

 - checks if B names an existing branch or just a commit

 - detaches HEAD at commit A

 - replays commits in DAG A..B on top of it; the exact way the
   history is replayed is affected by the options given (e.g. "-m"
   and "-p" may try to preserve history shapes)

 - if B was determined to be a branch name, "git branch -f" to it;
   otherwise leave the HEAD detached.

which all sounds OK, but I do not see a huge improvement over the
current "git rebase [--options] A B" (other than that you can type
double dot instead of a single space).