A minimalistic, git-aware, and relatively fast prompt for fish shell
Just place the file fish_prompt.fish inside the ~/.config/fish/functions directory.
For the prompt to work as advertised, you'll need git and the powerline fonts.
I have never tried this prompt with anything other than a black background. It may look horrible on non-black backgrounds. I will never know.
A screenshot illustrating how the prompt changes with git status / errors / non-writable directories :
