fish prompt with rvm and git info

Just started using fish today and I'm really loving it. It took a bit to port my prompt configuration from zsh but was able to finally figure it out:

put this in your ~/.config/fish/fish.config

function _git_branch_name
  echo (git symbolic-ref HEAD ^/dev/null | sed -e 's|^refs/heads/||')
end

function _is_git_dirty
  echo (git status -s --ignore-submodules=dirty ^/dev/null)
end

function _unpushed
  echo (git cherry -v "@{upstream}" ^/dev/null)
end

function rvm_prompt
  set -l yellow (set_color -o yellow)
  if [ (which rvm) ]
    set -l identifier (rvm tools identifier)
    echo "$yellow$identifier "
  else
    echo ""
  end
end

function fish_prompt
  set -l cyan (set_color cyan)
  set -l yellow (set_color yellow)
  set -l red (set_color -o red)
  set -l blue (set_color blue)
  set -l magenta (set_color -o magenta)
  set -l normal (set_color normal)

  set -l arrow "$red➜"
  set -l cwd $cyan(basename (prompt_pwd))

  if [ (_git_branch_name) ]
    set -l git_branch $red(_git_branch_name)
    set git_info "$blue git:($git_branch$blue)"

    set -l with_unpushed (_git_branch_name)

    if [ (_is_git_dirty) ]
      set arrow "$red✗"
    end

    if [ (_unpushed) ]
      set git_info "$git_info$normal with$magenta unpushed"
    end
  end

  echo -e \n
  echo -n -s  (rvm_prompt) $cwd $git_info
  echo -e \n$arrow $normal
end

Turns out the fish syntax is much nicer than bash. Well worth the effort to migrate.