How I generate my prompt.

vcs_prompt.sh

function __svn_ps1 {
  local d=$(svn info 2>&1 | grep -Po "/(branches|trunk).*$")
  if [ -n "$d" ]; then
    echo -en "[svn:$d]"
  fi 
}

function __git_ps1 {
  local d=$(git st 2>&1| grep -Po "branch .*")
  if [ -n "$d" ]; then
    echo -en "[git:$d]"
  fi 
}

function __vcs_ps1 {
  git=$(__git_ps1)
  if [ -n "$git" ]; then
    echo -en $git
  else
    svn=$(__svn_ps1)
    if [ -n "$svn" ]; then
      echo -en $svn
    fi
  fi
}

PS1="\[\e[0;32m\]\h\[\e[0m\]:\[\e[1;35m\]\W\[\e[0m\] \[\e[1;33m\]\$(__vcs_ps1)\[\e[0m\]\$ "