Re: diff <commit> using 3-dot behavior

[Michael J Gruber <git@drmicha.warpmail.net>]

Robert Dailey venit, vidit, dixit 24.08.2016 16:28:
> I want to view the complete diff of my branch (topic) relative to its
> parent branch (master). This should include cached/staged files and
> unstaged working tree changes.
> 
> If I do this:
> 
> $ git diff master
> 
> This will include changes on master *since* my last merge, which I do
> not want (I don't want to see changes on master, only on topic). I
> tried this:
> 
> $ git diff master --not master
> 
> This didn't give me any output. If I do this:
> 
> $ git diff master...topic
> 
> This shows me only committed changes on topic, but excludes staged &
> unstaged changes.
> 
> How can I get the results I want?

The 3-dot notation means:

Show the difference between the merge-base of master and topic, and topic.

I'm not completely sure, but I guess what you want is:

Show the difference between the merge-base of master and topic, and the
worktree.

You can accomplish this with:

git diff $(git merge-base master topic)

I guess a shorter notation for that could come in handy. OTOH, I usually
diff against HEAD in a situation like that.

Cheers,
Michael