Fish Shell config file with git branch and current RVM

config.fish

set -g -x PATH /usr/local/bin $PATH

function fish_prompt --description 'Write out the prompt'
    # Just calculate these once, to save a few cycles when displaying the prompt
    if not set -q __fish_prompt_hostname
    set -g __fish_prompt_hostname (hostname|cut -d . -f 1)
    end

    if not set -q __fish_prompt_normal
    set -g __fish_prompt_normal (set_color normal)
    end

    if not set -q __git_cb
    set __git_cb (set_color brown)(git branch ^/dev/null | grep \* | sed 's/* //')(set_color normal)""
    end
 
    if [ -e ./.ruby-gemset ]
      if not set -q __rvm_curr 
        set __rvm_curr ""(set_color blue)(rvm current)(set_color normal)"" 
      end
    end

    switch $USER

    case root

    if not set -q __fish_prompt_cwd
        if set -q fish_color_cwd_root
            set -g __fish_prompt_cwd (set_color $fish_color_cwd_root)
        else
            set -g __fish_prompt_cwd (set_color $fish_color_cwd)
        end
    end

    printf '%s@%s:%s%s%s%s# ' $USER $__fish_prompt_hostname "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_normal" $__git_cb

    case '*'

    if not set -q __fish_prompt_cwd
        set -g __fish_prompt_cwd (set_color $fish_color_cwd)
    end

    if test -d $__git_cb
        printf '%s@%s:%s%s%s$ ' $USER $__fish_prompt_hostname "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_normal"
    else
        printf '%s@%s:%s%s%s (%s) [%s] $ ' $USER $__fish_prompt_hostname "$__fish_prompt_cwd" (prompt_pwd) "$__fish_prompt_normal" $__rvm_curr $__git_cb 
    end

    end
end