> I would like to have in the modline: the name of the branch, say master
> *and* the let me call it «inverse version» like master~1 master~2


It seems that the command 

  (shell-command "git name-rev HEAD")

Does what I want.

And it seems that vc-git-mode-line-string return a string to the mode
line

So how can I configure that function to have the result of git name-rev
HEAD?

I have never touched the modeline, so I have now idea how to proceed,
any help would be appreciated.

Regards

Uwe Brauer