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Get notified when there are unmerged changes from origin

~~Sometimes I work with git repos that have some changes fetched but not yet merged to the local branch. Occasionally I make commits without noticing this, which necessitates rebase/conflict resolution.~~
~~I would like to be notified when I'm working with a git repository such as this. Is there a way to configure either git or my shell (fish) to automatically print a message like:~~
~~>Warning: Local branch is not even with upstream, merge changes to rectify.~~
~~? It doesn't have to be a message, just any reasonable way of notifying me will do.~~

Sometimes I work with Git repos that have some changes fetched but not yet merged to the local branch. Occasionally I make commits without noticing this, which necessitates rebase/conflict resolution.
I would like to be notified when I'm working with a Git repository such as this. Is there a way to configure either Git or my shell (fish) to automatically print a message like below?
> Warning: Local branch is not even with upstream, merge changes to rectify.
It doesn't have to be a message, just any reasonable way of notifying me will do.

git convenience automation