VonHeikemen bash prompt

theme.bash

#!/usr/bin/env bash

# bash prompt by VonHeikemen
# https://github.com/VonHeikemen/dotfiles/blob/master/my-configs/bash/theme.bash

black="\[\e[0;30m\]"
red="\[\e[0;31m\]"
green="\[\e[0;32m\]"
yellow="\[\e[0;33m\]"
blue="\[\e[0;34m\]"
purple="\[\e[0;35m\]"
cyan="\[\e[0;36m\]"
white="\[\e[0;37m\]"
orange="\[\e[0;91m\]"

bold_black="\[\e[30;1m\]"
bold_red="\[\e[31;1m\]"
bold_green="\[\e[32;1m\]"
bold_yellow="\[\e[33;1m\]"
bold_blue="\[\e[34;1m\]"
bold_purple="\[\e[35;1m\]"
bold_cyan="\[\e[36;1m\]"
bold_white="\[\e[37;1m\]"
bold_orange="\[\e[91;1m\]"

normal="\[\e[0m\]"
reset_color="\[\e[39m\]"

STATUS_THEME_PROMPT_BAD="${bold_red}❯${reset_color}${normal} "
STATUS_THEME_PROMPT_OK="${bold_purple}❯${reset_color}${normal} "

# This can do the same thing `_dirtrim` does
# but it only works on Bash 4+
# PROMPT_DIRTRIM=3 

_dirtrim()
{
  echo "$1"  | rev | cut -d"/" -f1-3 | rev
}

_git_current_branch()
{
  local ref
  ref=$(command git symbolic-ref --quiet HEAD 2> /dev/null)
  local ret=$?
  if [[ $ret != 0 ]]; then
    [[ $ret == 128 ]] && return  # no git repo.
    ref=$(command git rev-parse --short HEAD 2> /dev/null) || return
  fi
  echo ${ref#refs/heads/}
}

_git_state()
{
  if [ -z "$(git status -s)" ];then # it's "clean"
    echo "${green}✔"
  else
    echo "${red}✗"
  fi
}

_git_info()
{
  if git rev-parse --git-dir > /dev/null 2>&1; then
    echo "${green}$(_git_current_branch) $(_git_state)${reset_color}"
  fi
}

_myprompt() 
{
  local ret_status="$( [ $? -eq 0 ] && echo -e "$STATUS_THEME_PROMPT_OK" || echo -e "$STATUS_THEME_PROMPT_BAD")"
  PS1="\n${blue}\$(_dirtrim \"\w\") $(_git_info)\n${ret_status}"
}

PROMPT_COMMAND=_myprompt