When using OSX’s git, after I modify a file I can simply do git commit , and that’ll auto complete the file’s name to the one that was modified. Howe
I know this is an old post, but you don't really need to install any additional packages.
Homebrew is informing you that there is a directory with all the stuff you need.
You can simply add the following line to your .bash_profile if you are using Bash:
source /usr/local/etc/bash_completion.d/git-completion.bash