Add current git branch to fish

fish.config

set fish_git_dirty_color red
function parse_git_dirty
         git diff --quiet HEAD ^&-
         if test $status = 1
            echo (set_color $fish_git_dirty_color)"Δ"(set_color normal)
         end
end
function parse_git_branch
         # git branch outputs lines, the current branch is prefixed with a *                                                                                                                                                               
         set -l branch (git rev-parse --abbrev-ref HEAD)
         echo $branch (parse_git_dirty)
end

function fish_prompt
         if test -z (git branch --quiet 2>| awk '/fatal:/ {print "no git"}')
            printf '%s@%s %s%s%s (%s) $ ' (whoami) (hostname|cut -d . -f 1) (set_color $fish_color_cwd) (prompt_pwd) (set_color normal) (parse_git_branch)
         else
            printf '%s@%s %s%s%s $ '  (whoami) (hostname|cut -d . -f 1) (set_color $fish_color_cwd) (prompt_pwd) (set_color normal)
         end
end