_show_last_exit_smilie() {
  # If the exit status of the last run command was a 0 (success), show a smile, otherwise a frown
  exit_status=$?
  if [[ "$exit_status" -ne 0 ]]; then
    echo "${NORMAL}[${RED}:(${NORMAL}]"
  else
    echo "${NORMAL}[${GREEN}:)${NORMAL}]"
  fi
}


# This function was modified from one found @ https://www.reddit.com/r/linux/comments/2uf5uu/this_is_my_bash_prompt_which_is_your_favorite/?st=jikgswh4&sh=371ba8bf
_git_status() {
  local unknown untracked stash clean ahead behind staged dirty diverged
  unknown=$BLUE
  untracked=$GREEN
  stash=$GREEN
  clean=$GREEN
  ahead=$YELLOW
  behind=$YELLOW
  staged=$CYAN
  dirty=$RED
  diverged=$RED


  branch=$(git rev-parse --abbrev-ref HEAD 2>/dev/null)
  if [[ -n "$branch" ]]; then
    git_status=$(git status 2> /dev/null)
    # If nothing changes the color, we can spot unhandled cases.
    color=$unknown
    if [[ $git_status =~ 'Untracked files' ]]; then
      color=$untracked
      branch="${branch}?"
    fi
    if git stash show &>/dev/null; then
      color=$stash
      branch="${branch}+"
    fi
    if [[ $git_status =~ 'working directory clean' ]]; then
      color=$clean
    fi
    if [[ $git_status =~ 'Your branch is ahead' ]]; then
      color=$ahead
      branch="${branch}>"
    fi
    if [[ $git_status =~ 'Your branch is behind' ]]; then
      color=$behind
      branch="${branch}<"
    fi
    if [[ $git_status =~ 'Changes to be committed' ]]; then
      color=$staged
    fi
    if [[ $git_status =~ 'Changed but not updated' ||
          $git_status =~ 'Changes not staged'      ||
          $git_status =~ 'Unmerged paths' ]]; then
      color=$dirty
    fi
    if [[ $git_status =~ 'Your branch'.+diverged ]]; then
      color=$diverged
      branch="${branch}!"
    fi
    echo -n "${NORMAL}|${color}${branch}${NORMAL}|"
  fi
}


set_prompt() {
  if [ $1 = yes ]; then
    echo -n "${debian_chroot:+($debian_chroot)}${GREEN}\u${NORMAL}[${BLUE}\w${NORMAL}]$(_show_last_exit_smilie)$(_git_status)\$ "
  else
    echo -n "${debian_chroot:+($debian_chroot)}\u@\h:\w\$ "
  fi
}