# align git diff a..b semantics with git log a..b

1 messages from 2006-05-15 to 2006-05-15. Participants: Salikh Zakirov.
Thread: https://gitlist.dev/t/4144

## Salikh Zakirov, 2006-05-15 08:41

Subject: align git diff a..b semantics with git log a..b
Message-ID: <44683EBF.9070307@Intel.com>
URL: https://gitlist.dev/e/44683EBF.9070307%40Intel.com

```
Hi,

Currently, git-diff accepts

	git-diff A..B

syntax, and the output seems to be equivalent of 'git-diff A B'.

IMHO, this conflicts with A..B semantics defined for git-log family of commands.
Consider following tree

O--X--Y--A1--A2  (a)
       \
        B1--B2  (b)

The command 'git log a..b' will show B1,B2, so I would find it
intuitive (and useful) to have 'git diff a..b' show B1+B2,
rather than -A2-A1+B1+B2.

So, I suggest to change semantics of 'git diff a..b'
to 'git diff `git-merge-base a b` b'.

I could contribute the documentation change if the idea is accepted and implemented.

Thanks a lot!

```