How do I make Git use the editor of my choice for commits?

Question

I would prefer to write my commit messages in Vim, but it is opening them in Emacs.

How do I configure Git to always use Vim? Note that I want to do this globally,

Answer 1

Atom as your git editor

git config --global core.editor "atom --wait"

Atom needs to be configured to run from the command line for the above to work:

OS X: install shell commands from Atom: menu bar > Atom > Install Shell Commands

Windows: no action required - atom is configured to run from the command line by default