Add explicit backend between standalone and pyside

meshroom/__init__.py

@@ -0,0 +1,12 @@
+from enum import Enum  # available by default in python3. For python2: "pip install enum34"
+
+class Backend(Enum):
+    STANDALONE = 1
+    PYSIDE = 2
+
+backend = Backend.STANDALONE
+
+def useUI():
+	global backend
+	backend = Backend.PYSIDE
+

meshroom/common/__init__.py

@@ -1,13 +1,15 @@
+import meshroom
+
 Model = None
 Slot = None
 Signal = None
 Property = None
 BaseObject = None
 
-if 1:  # TODO: switch types according to something
+if meshroom.backend == meshroom.Backend.PYSIDE:
     # PySide types
     from .qt import Model, Slot, Signal, Property, BaseObject
-else:
+elif meshroom.backend == meshroom.Backend.STANDALONE:
     # Core types
     from .core import Model, Slot, Signal, Property, BaseObject
 

meshroom/ui/__init__.py

@@ -0,0 +1,4 @@
+import meshroom
+meshroom.useUI()
+
+__version__ = '0.1.0'