make a prompt for ruby/rails/git development

bash_prompt.sh

#!/bin/bash

function prompt_command {
  local nowDate="`date "+%H:%M:%S|%a,%m-%d"`"
  local rubyv=''
  branch=`git branch 2> /dev/null`
  if [ $? -eq 0 ]; then
    local branch="`echo "$branch" | sed -n 's/^\* \(.*\)$/\1/p'`"
    local temp=`ruby --version`
    if [ $? -eq 0 ]; then
      local rubyv="${temp:5:5}"
    fi
  fi
  temp="-(${PWD})-XXX-$branch-$rubyv-(${nowDate})-"
  let fillsize=${COLUMNS}-${#temp}
  if [ "$fillsize" -gt "0" ]; then
  fill="--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------"
    fill="${fill:0:${fillsize}}"
    newPWD="${PWD}"
  fi
  if [ "$fillsize" -lt "0" ]; then
    fill=""
    let cut=3-${fillsize}
    newPWD="...${PWD:${cut}}"
  fi

  local NO_COLOUR="\[\033[0m\]"
  local WHITE="\[\033[1;37m\]"
  local RED='\e[1;31m'
  local GREEN='\e[1;32m'
  local LIGHT_BLUE="\[\033[1;34m\]"
  local YELLOW="\[\033[1;33m\]"

  case $TERM in
      xterm*|rxvt*)
          TITLEBAR='\[\033]0;\w \u@\h\007\]'
          ;;
      *)
          TITLEBAR=""
          ;;
  esac
  PS1="${TITLEBAR}${YELLOW}-${NO_COLOUR}(${LIGHT_BLUE}${newPWD}${NO_COLOUR})${YELLOW}-${RED}\$?${YELLOW}-${GREEN}${branch}${YELLOW}-${GREEN}${rubyv}${YELLOW}-${fill}-${NO_COLOUR}[${LIGHT_BLUE}${nowDate}${NO_COLOUR}]${YELLOW}-\n-${LIGHT_BLUE}$(whoami)@$(hostname -s)${NO_COLOUR}\$ "
  unset branch
}

PROMPT_COMMAND=prompt_command