Bash Prompt Upgrades

gistfile1.sh

# -------------------------------------------------------
# Prompt / Xterm
# -------------------------------------------------------

# Prompt colors
_txt_col="\e[00m"     # Std text (white)
_bld_col="\e[01;37m"  # Bold text (white)
_wrn_col="\e[01;31m"  # Warning
_sep_col=$_txt_col    # Separators
_usr_col="\e[01;32m"  # Username
_cwd_col=$_txt_col    # Current directory
_hst_col="\e[0;32m"   # Host
_env_col="\e[0;36m"   # Prompt environment
_git_col="\e[01;36m"  # Git branch

# Returns the current git branch (returns nothing if not a git repository)
parse_git_branch() {
  git branch 2> /dev/null | sed -e '/^[^*]/d' -e 's/* \(.*\)/\1/'
}

parse_git_dirty() {
  [[ $(git status 2> /dev/null | tail -n1) != "nothing to commit (working directory clean)" ]] && echo "±"
}

# Returns the current ruby version.
parse_ruby_version() {
  if (which ruby | grep -q ruby); then
    ruby -v | cut -d ' ' -f2
  fi
}

# Set the prompt string (PS1)
# Looks like this:
#     user@computer ~/src/ubuntu_config [master|1.8.7]$

# (Prompt strings need '\['s around colors.)
set_ps1() {
  user_str="\[$_usr_col\]\u\[$_hst_col\]@\h\[$_txt_col\]"
  dir_str="\[$_cwd_col\]\w"
  git_branch=`parse_git_branch`
  git_dirty=`parse_git_dirty`
  ruby=`parse_ruby_version`

  git_str="\[$_git_col\]$git_branch\[$_wrn_col\]$git_dirty"
  # Git repo & ruby version
  if [ -n "$git_branch" ] && [ -n "$ruby" ]; then
    env_str="\[$_env_col\][$git_str\[$_env_col\]|$ruby]"
  # Just git repo
  elif [ -n "$git_branch" ]; then
    env_str="\[$_env_col\][$git_str\[$_env_col\]]"
  # Just ruby version
  elif [ -n "$ruby" ]; then
    env_str="\[$_env_col\][$ruby]"
  else
    unset env_str
  fi

  # < username >@< hostname > < current directory > [< git branch >|< ruby version >]
  PS1="${debian_chroot:+($debian_chroot)}$user_str $dir_str $env_str\[$_sep_col\]$ \[$_txt_col\]"
}

# Set custom prompt
PROMPT_COMMAND='set_ps1;'

# Set GREP highlight color
export GREP_COLOR='1;32'

# Custom Xterm/RXVT Title
case "$TERM" in
xterm*|rxvt*)
    PROMPT_COMMAND+='echo -ne "\e]0;${USER}@${HOSTNAME}: ${PWD}\007";'
    ;;
*)
    ;;
esac

# -------------------------------------------------------
# Prompt / Xterm
# -------------------------------------------------------

Since git 1.8.0, string "nothing to commit (working directory clean)" changed to "nothing to commit, working directory clean".