gistfile1.sh

function __git_dirty {
  git diff --quiet HEAD &>/dev/null 
  [ $? == 1 ] && echo "!"
}

function __git_branch {
  __git_ps1 "(%s)"
}

function __my_rvm_ruby_version {
  local gemset=$(echo $GEM_HOME | awk -F'@' '{print $2}')
  [ "$gemset" != "" ] && gemset="@$gemset"
  local version=$(echo $MY_RUBY_HOME | awk -F'-' '{print $2}')
  [ "$version" == "1.8.7" ] && version=""
  local full="$version$gemset"
  [ "$full" != "" ] && echo "$full "
}

# via http://tammersaleh.com/posts/a-better-rvm-bash-prompt
bash_prompt() {
  local NONE="\[\033[0m\]"    # unsets color to term's fg color

  # regular colors
  local K="\[\033[0;30m\]"    # black
  local R="\[\033[0;31m\]"    # red
  local G="\[\033[0;32m\]"    # green
  local Y="\[\033[0;33m\]"    # yellow
  local B="\[\033[0;34m\]"    # blue
  local M="\[\033[0;35m\]"    # magenta
  local C="\[\033[0;36m\]"    # cyan
  local W="\[\033[0;37m\]"    # white

  local UC=$W                 # user's color
  [ $UID -eq "0" ] && UC=$R   # root's color

  PS1="$W\$(__my_rvm_ruby_version)$R\w $Y\$(__git_branch)$R\$(__git_dirty)${NONE}$ "
}

bash_prompt
unset bash_prompt