Hackish Git like SVN stash drop in shell function

svn_stash.sh

svn() {
     local svn_cmd='/usr/bin/env svn'
     case $1 in
         stash)
             case $2 in
                 "")
                     if ! $svn_cmd status | grep -q '^M'; then
                         echo "No outstanding changes"
                         return
                     fi
 
                     echo "Stashing changes..."
                     $svn_cmd diff > .svn/.stash_$(date +%s).patch
                     $svn_cmd revert -R .
                     ;;
                 list)
                     for entry in .svn/.stash_*.patch; do
                         local entry_ts="$(echo $entry | egrep -o '[0-9]+')"
                         echo $entry_ts
                     done
                     ;;
                 pop)
                     shopt -s nullglob
                     stash_ts=0
                     for entry in .svn/.stash_*.patch; do
                         local entry_ts="$(echo $entry | egrep -o '[0-9]+')"
                         if (( stash_ts < entry_ts )); then
                             stash_file=$entry
                             stash_ts=$entry_ts
                         fi
                     done
 
                     if (( stash_ts == 0 )); then
                         echo "No stashes available"
                         return
                     fi
 
                     echo "Popping changes stashed on #${stash_ts}..."
                     if ! patch -p0 < ${stash_file}; then
                         echo "Patch not fully applied, will not remove patch file"
                         return
                     fi
 
                     rm ${stash_file}
                     ;;
             esac
             ;;
         *)
             $svn_cmd $@
             ;;
     esac
 }