Re: diff <commit> using 3-dot behavior

From: Junio C Hamano <gitster@pobox.com>
Date: Aug 24, 2016, 16:22 UTC
Message-ID: <xmqqbn0irvan.fsf@gitster.mtv.corp.google.com>
In-Reply-To: <CAHd499DL2WiTgnk5A--qihUh-jF9m7aXDzHAQuW=bLRVW4Bniw@mail.gmail.com>

Robert Dailey <rcdailey.lists@gmail.com> writes:

> $ git diff master...topic

... which is defined roughly as

	git diff $(git merge-base master topic) topic

The merge-base is to compute the point you forked your topic from the mainline. So if you want to compare your current state in the index with the fork point, you'd do

	git diff --cached $(git merge-base master topic)

and comparing your working tree state would be

	git diff --cached $(git merge-base master topic)