support sun position addon on blender 4.2

src/blenderbim/blenderbim/bim/module/light/decorator.py

@@ -21,12 +21,6 @@ import blf
 import gpu
 import bmesh
 import blenderbim.tool as tool
-
-try:
-    import sun_position.sun_calc
-except ImportError:
-    sun_position = None
-
 from bpy.types import SpaceView3D
 from math import radians
 from mathutils import Vector, Matrix
@@ -34,6 +28,8 @@ from gpu_extras.batch import batch_for_shader
 from bpy_extras.view3d_utils import location_3d_to_region_2d
 from blenderbim.bim.module.light.data import SolarData
 
+sun_position = tool.Blender.get_sun_position_addon()
+
 
 class SolarDecorator:
     is_installed = False

src/blenderbim/blenderbim/bim/module/light/prop.py

@@ -20,12 +20,6 @@ import bpy
 import pytz
 import tzfpy
 import datetime
-
-try:
-    import sun_position.sun_calc
-except ImportError:
-    sun_position = None
-
 import blenderbim.tool as tool
 from math import radians, pi
 from mathutils import Euler, Vector, Matrix, Quaternion
@@ -34,6 +28,8 @@ from bpy.types import PropertyGroup
 from blenderbim.bim.module.light.data import SolarData
 from blenderbim.bim.module.light.decorator import SolarDecorator
 
+sun_position = tool.Blender.get_sun_position_addon()
+
 
 def get_sites(self, context):
     if not SolarData.is_loaded:

src/blenderbim/blenderbim/bim/module/light/ui.py

@@ -17,13 +17,11 @@
 # along with BlenderBIM Add-on.  If not, see <http://www.gnu.org/licenses/>.
 
 import bpy
+import blenderbim.tool as tool
 from blenderbim.bim.module.light.data import SolarData
 
-try:
-    import sun_position
-    from sun_position.sun_calc import format_time, format_hms, sun
-except ImportError:
-    sun_position = None
+
+sun_position = tool.Blender.get_sun_position_addon()
 
 
 class BIM_PT_radiance_exporter(bpy.types.Panel):

src/blenderbim/blenderbim/tool/blender.py

@@ -27,6 +27,7 @@ import blenderbim.core.tool
 import blenderbim.tool as tool
 import blenderbim.bim
 import addon_utils
+import types
 from mathutils import Vector
 from pathlib import Path
 from blenderbim.bim.ifc import IFC_CONNECTED_TYPE
@@ -1116,3 +1117,29 @@ class Blender(blenderbim.core.tool.Blender):
     def get_addon_preferences(cls) -> blenderbim.bim.ui.BIM_ADDON_preferences:
         blender_package_name = cls.get_blender_addon_package_name()
         return bpy.context.preferences.addons[blender_package_name].preferences
+
+    @classmethod
+    def get_sun_position_addon(cls) -> Union[types.ModuleType, None]:
+        # Check if it's installed as legacy Blender addon.
+        try:
+            import sun_position
+        except ImportError:
+            sun_position = None
+
+        if sun_position:
+            return
+
+        # No extensions prior to 4.2.
+        if bpy.app.version < (4, 2, 0):
+            return sun_position
+
+        if sun_position:
+            return sun_position
+
+        import importlib
+
+        for package_name in bpy.context.preferences.addons.keys():
+            if package_name.endswith(".sun_position"):
+                sun_position = importlib.import_module(package_name)
+
+        return sun_position