How to use a bash function in a git alias?

Question

I want to use a bash function in a git alias. So I added this to my .bashrc:

fn() {
    echo \"Hello, world!\"
}
export -f fn

Answer 1

I don't know why, but if I just put a space before the function name in .gitconfig, it works without a problem and outputs the message:

[alias]
    fn = ! fn

It might be a bug in git, or I'm missing something in the documentation.