Showing git branch in fish shell prompt. Put following code at the end of ~/.config/fish/config.fish. It will also highlight in red if branch is dirty. Based on http://zogovic.com/post/37906589287/showing-git-branch-in-fish-shell-prompt

config.fish

set fish_git_dirty_color red
set fish_git_not_dirty_color green

function parse_git_branch
  set -l branch (git branch 2> /dev/null | grep -e '\* ' | sed 's/^..\(.*\)/\1/')
  set -l git_status (git status -s)

  if test -n "$git_status"
    echo (set_color $fish_git_dirty_color)$branch(set_color normal)
  else
    echo (set_color $fish_git_not_dirty_color)$branch(set_color normal)
  end
end

function fish_prompt
  set -l git_dir (git rev-parse --git-dir 2> /dev/null)
  if test -n "$git_dir"
    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

Thanks for this

You can also just type fish_config on the command line, click on prompt and select a prompt with the current branch from the large number of prompts offered. I use lonetwin.