add git info to terminal prompt

git_prompt.sh

parse_git_path() {
  repo=$(git rev-parse --git-dir 2>/dev/null)
  if [ -n $repo ]
  then
      repo=$(echo $repo | sed 's/.git$//')
      if [ -z $repo ]
      then
          repo=$PWD
      else
          home=$HOME
          repo=$(echo $repo | sed 's/\/$//')
      fi
  fi
  repo=$(echo $repo | sed 's,'"$HOME"',~,')
  echo ${repo##*/}
}

parse_git_branch () {
  repo=$(git rev-parse --git-dir 2>/dev/null)
  if [ -n $repo ]
  then
      if git rev-parse --git-dir >/dev/null 2>&1
      then
          branch=$(git branch 2>/dev/null| sed -n '/^\*/s/^\* //p')
          if git diff --quiet 2>/dev/null >&2
          then
              branch=$branch
          else
              branch=$branch'*'
          fi
      else
          return 0
      fi
      #branch=$branch
  fi
  echo "("$branch")"
}

parse_git_subdir() {
  local subdir=""
  repo=$(git rev-parse --git-dir 2>/dev/null)
  if [ -n $repo ]
  then
      repo=$(echo $repo | sed 's/.git$//')
      if [ -z $repo ]
      then
          return 0
      else
          home=$HOME
          subdir="/"$(echo $PWD | sed 's,'"$repo"',,')
      fi
  fi
  echo $subdir
}


BASE="\[\033[0;37m\]"
MAGENTA="\[\033[0;35m\]"
GREEN="\[\033[0;32m\]"
BLUE="\[\033[0;36m\]"

PS1="$BLUE\$(parse_git_path)$MAGENTA\$(parse_git_branch)$BASE\$(parse_git_subdir)$BASE: "
export PROMPT_COMMAND='echo -ne "\033]0;${PWD/#$HOME/~} `git branch 2>&1 | grep "*" | awk -F" " "{print $2}"`"; echo -ne "\007"'