Hook preventing merge commits

[AFulgens]

Context

In many Git workflows rebase of an ephemeral branch is preferred over merging long-living branches into ephemeral branches. I.e., these projects have the stance that there should be no Merge branch 'develop' into 'feature/X' commits. This is mostly backup up by graph theory, "nicer history", and that it minimizes the probability of foxtrot merges.

All this presumes that you are working with no fast-forward merges, no rebase merges; i.e., you are using GitFlow (https://nvie.com/posts/a-successful-git-branching-model/) or a similar history management strategy.

Idea

Create a hook, which prevents merge commits on configured branches. For consistency with already existing hook by default feature, bugfix, and hotfix should be considered by the hook and this list could be overriden by arguments.