Re: help understanding git diff output

> Eugene Sajine <euguess@gmail.com> writes:
>
>> I get empty diff when i execute:
>>
>> $git diff branch1..branch2
>>
>> and i also get empty diff when running
>>
>> $git diff branch2..branch1
>
> The thing is, "diff" is about comparing "two endpoints".
>
> We still do support, as a backward compatibility measure, the A..B
> notation to help people who learned "git diff" from ancient documents, and
> we don't plan to deprecate the notation in any way, but don't be fooled by
> the notation which usually means "the range from A to B".  In the context
> of diff, it does not mean a range, as diff is about two "endpoints".
>
>> What i cannot wrap my mind around is why the command below with
>> symmetric difference range gives me non-empty diff
>>
>> $git diff branch1...branch2
>
> "git diff A...B" is a short-hand for "git diff $(git merge-base A B) B",
> naming the fork point between branches A and B as one end, and B as the
> other end, of the diff.  Again, diff is about two "endpoints", and the
> notation does not mean a symmetric difference range.
>
>
>