Add pyenv-virtualenvwrapper

Based on virtualenvwrapper, but useful if using pyenv

plugins/pyenv-virtualenvwrapper/pyenv-virtualenvwrapper.plugin.zsh

@@ -0,0 +1,51 @@
+eval "$(pyenv init -)"
+eval "$(pyenv-sh-virtualenvwrapper -)"
+
+  if [[ ! $DISABLE_VENV_CD -eq 1 ]]; then
+    # Automatically activate Git projects's 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 {
+        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 (( $? != 0 )); then
+                PROJECT_ROOT="."
+            fi
+            # Check for virtualenv name override
+            if [[ -f "$PROJECT_ROOT/.venv" ]]; then
+                ENV_NAME=`cat "$PROJECT_ROOT/.venv"`
+            elif [[ "$PROJECT_ROOT" != "." ]]; then
+                ENV_NAME=`basename "$PROJECT_ROOT"`
+            else
+                ENV_NAME=""
+            fi
+            if [[ "$ENV_NAME" != "" ]]; then
+                # 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
+            unset PROJECT_ROOT
+            unset WORKON_CWD
+        fi
+    }
+
+    # Append workon_cwd to the chpwd_functions array, so it will be called on cd
+    # http://zsh.sourceforge.net/Doc/Release/Functions.html
+    # TODO: replace with 'add-zsh-hook chpwd workon_cwd' when oh-my-zsh min version is raised above 4.3.4
+    if (( ${+chpwd_functions} )); then
+        if (( $chpwd_functions[(I)workon_cwd] == 0 )); then
+            set -A chpwd_functions $chpwd_functions workon_cwd
+        fi
+    else
+        set -A chpwd_functions workon_cwd
+    fi
+  fi