added prealunch hook that will add python 2 ftrack api modules to PYTHONPATH

pype/modules/ftrack/launch_hooks/pre_python2_vendor.py

@@ -0,0 +1,27 @@
+import os
+from pype.lib import PreLaunchHook
+from pype.modules.ftrack import FTRACK_MODULE_DIR
+
+
+class PrePyhton2Support(PreLaunchHook):
+    """Add python ftrack api module for Python 2 to PYTHONPATH.
+
+    Path to vendor modules is added to the beggining of PYTHONPATH.
+    """
+    # There will be needed more granular filtering in future
+    app_groups = ["maya", "nuke", "nukex", "hiero", "nukestudio"]
+
+    def execute(self):
+        # Prepare dir path
+        python2_vendor = os.path.join(FTRACK_MODULE_DIR, "python2_vendor")
+        # Load PYTHONPATH from current launch context
+        python_path = self.launch_context.env.get("PYTHONPATH")
+
+        # Just override if PYTHONPATH is not set yet
+        if not python_path:
+            python_path = python2_vendor
+        else:
+            python_path = os.pathsep.join([python2_vendor, python_path])
+
+        # Set new PYTHONPATH to launch context environments
+        self.launch_context.env["PYTHONPATH"] = python_path