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
# -------------------------------------------------------

Yea, I've just left it in there. Been trying to think of something useful to put in its place.

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