Detect the .venv in any parent directory of the current directory

plugins/virtualenvwrapper/virtualenvwrapper.plugin.zsh

@@ -29,8 +29,11 @@ if [[ ! $DISABLE_VENV_CD -eq 1 ]]; then
     if [ ! $WORKON_CWD ]; then
       WORKON_CWD=1
       # Check if this is a Git repo
-      PROJECT_ROOT=`git rev-parse --show-toplevel 2> /dev/null`
-      if (( $? != 0 )); then
+      PROJECT_ROOT=`pwd`
+      while [[ "$PROJECT_ROOT" != "/" && ! -e "$PROJECT_ROOT/.venv" ]]; do
+        PROJECT_ROOT=`realpath $PROJECT_ROOT/..`
+      done
+      if [[ "$PROJECT_ROOT" == "/" ]]; then
         PROJECT_ROOT="."
       fi
       # Check for virtualenv name override