Plugin which loads Python virtualenvwrapper and activates virtualenvs on cd into git repos

plugins/virtualenvwrapper/virtualenvwrapper.plugin.zsh

+WRAPPER_FOUND=0
+for wrapsource in "/usr/local/bin/virtualenvwrapper.sh" "/etc/bash_completion.d/virtualenvwrapper" ; do
+  if [[ -e $wrapsource ]] ; then
+    WRAPPER_FOUND=1
+    source $wrapsource
+
+    if [[ ! $DISABLE_VENV_CD -eq 1 ]]; then
+      # Automatically activate Git projects' virtual environments based on the
+      # directory name of the project. Virtual environment name can be overridden
+      # by placing a .venv file in the project root with a virtualenv name in it
+      function workon_cwd {
+          # Check that this is a Git repo
+          GIT_DIR=`git rev-parse --git-dir 2> /dev/null`
+          if (( $? == 0 )); then
+              # Find the repo root and check for virtualenv name override
+              GIT_DIR=`readlink -f $GIT_DIR`
+              PROJECT_ROOT=`dirname "$GIT_DIR"`
+              ENV_NAME=`basename "$PROJECT_ROOT"`
+              if [[ -f "$PROJECT_ROOT/.venv" ]]; then
+                  ENV_NAME=`cat "$PROJECT_ROOT/.venv"`
+              fi
+              # Activate the environment only if it is not already active
+              if [[ "$VIRTUAL_ENV" != "$WORKON_HOME/$ENV_NAME" ]]; then
+                  if [[ -e "$WORKON_HOME/$ENV_NAME/bin/activate" ]]; then
+                      workon "$ENV_NAME" && export CD_VIRTUAL_ENV="$ENV_NAME"
+                  fi
+              fi
+          elif [ $CD_VIRTUAL_ENV ]; then
+              # We've just left the repo, deactivate the environment
+              # Note: this only happens if the virtualenv was activated automatically
+              deactivate && unset CD_VIRTUAL_ENV
+          fi
+      }
+
+      # New cd function that does the virtualenv magic
+      function cd {
+          builtin cd "$@" && workon_cwd
+      }
+    fi
+
+    break
+  fi
+done
+
+if [ $WRAPPER_FOUND -eq 0 ] ; then
+  print "zsh virtualenvwrapper plugin: Couldn't activate virtualenvwrapper. Please run \`pip install virtualenvwrapper\`."
+fi