It would be very nice if we could generate a report considering only commits which were introduced in a given branch.

We would probably need to compare the current branch (or a given branch) against another to know which commits we have that the other branch doesn't (eg, HEAD vs. master).

The functionality I'm thinking of is like the following but with git-journal output:

git log master..develop --oneline --no-merges

This would be a very useful feature when making a commit report for a pull requests.