initial implementation of blender's add_implementation_envs

openpype/hosts/blender/__init__.py

@@ -0,0 +1,41 @@
+import os
+
+
+def add_implementation_envs(env):
+    """Modify environments to contain all required for implementation."""
+    # Prepare path to implementation script
+    implementation_user_script_path = os.path.join(
+        os.environ["OPENPYPE_REPOS_ROOT"],
+        "repos",
+        "avalon-core",
+        "setup",
+        "blender"
+    )
+
+    # Add blender implementation script path to PYTHONPATH
+    python_path = env.get("PYTHONPATH") or ""
+    python_path_parts = [
+        path
+        for path in python_path.split(os.pathsep)
+        if path
+    ]
+    python_path_parts.insert(0, implementation_user_script_path)
+    env["PYTHONPATH"] = os.pathsep.join(python_path_parts)
+
+    # Modify Blender user scripts path
+    blender_user_scripts = env.get("BLENDER_USER_SCRIPTS") or ""
+    previous_user_scripts = []
+    for path in blender_user_scripts.split(os.pathsep):
+        if path and os.path.exists(path):
+            path = os.path.normpath(path)
+            if path != implementation_user_script_path:
+                previous_user_scripts.append(path)
+
+    env["OPENPYPE_BLENDER_USER_SCRIPTS"] = os.pathsep.join(
+        previous_user_scripts
+    )
+    env["BLENDER_USER_SCRIPTS"] = implementation_user_script_path
+
+    # Define Qt binding if not defined
+    if not env.get("QT_PREFERRED_BINDING"):
+        env["QT_PREFERRED_BINDING"] = "PySide2"