define __svn_ps1 like __git_ps1

__svn_ps1.sh

__svn_ps1() {
  if [[ -d .svn ]]; then
    local url=$(svn info | awk '/URL:/ {print $2}')
    local repo=$(echo $url | sed 's/^.*\/\(trunk\|branches\|tags\)/\1/')
    if $SVN_PS1_SHOWDIRTYSTATE; then
      svn st | grep -e '^[MA]' > /dev/null 2>&1
      local modified=$(echo $? | sed 's/0/+/' | sed 's/1//')
      svn st | grep '^?' > /dev/null 2>&1
      local added=$(echo $? | sed 's/0/*/' | sed 's/1//')
    fi
    if [ "$modified" -o "$added" ]; then
      echo " (${repo} ${modified}${added})"
    else
      echo " (${repo})"
    fi
  fi
}

Example

This is my PS1.

export PS1='[\t]\[\033[32m\]\u@\h\[\033[00m\]:\[\033[34m\]\w\[\033[31m\]$(__git_ps1)$(__svn_ps1)\[\033[00m\]\$ '

Example.

[11:10:52]user@yourhost:/path/to/project (trunk)$ 

If you set env SVN_PS1_SHOWDIRTYSTATE to true it shows a dirtystate;

SVN_PS1_SHOWDIRTYSTATE=true

Examples.

[11:10:52]user@yourhost:/path/to/project (trunk *)$ 
[11:10:52]user@yourhost:/path/to/project (trunk +)$ 
[11:10:52]user@yourhost:/path/to/project (trunk +*)$ 

Dirtystates meanings.

* : untracked file
+ : modified file