if ! [ -d "$ZSH/plugins/git-svn/git-svn-clone-externals" ] ;then
     git clone https://github.com/andrep/git-svn-clone-externals.git
 fi
 export PATH="$ZSH/plugins/git-svn/git-svn-clone-externals:$PATH"
 
 function git_svn_update {
     (cd "$ZSH/plugins/git-svn/git-svn-clone-externals" && \
         git pull origin master)
 }