Add pre-export & post-export hooks

addons/io_scene_gltf2/__init__.py

@@ -1097,6 +1097,7 @@ def execute(self, context):
         import os
         import datetime
         import logging
+        from .io.exp.user_extensions import export_user_extensions
         from .io.com.debug import Log
         from .blender.exp import export as gltf2_blender_export
         from .io.com.path import path_to_uri
@@ -1347,6 +1348,9 @@ def execute(self, context):
         # Initialize logging for export
         export_settings['log'] = Log(export_settings['loglevel'])
 
+        # Pre-export hook
+        export_user_extensions('pre_export_hook', export_settings)
+
         profile = bpy.app.debug_value == 102
         if profile:
             import cProfile
@@ -1371,6 +1375,9 @@ def execute(self, context):
 
         export_settings['log'].flush()
 
+        # Post-export hook
+        export_user_extensions('post_export_hook', export_settings)
+
         return res
 
     def draw(self, context):

example-addons/example_gltf_exporter_extension/__init__.py

@@ -75,3 +75,9 @@ def gather_node_hook(self, gltf2_object, blender_object, export_settings):
                 extension={"float": self.properties.float_property},
                 required=extension_is_required
             )
+
+def glTF2_pre_export_callback(export_settings):
+    print("This will be called before exporting the glTF file.")
+
+def glTF2_post_export_callback(export_settings):
+    print("This will be called after exporting the glTF file.")

example-addons/example_gltf_exporter_extension/readme.md

@@ -18,6 +18,8 @@ If you want to use this file as a base of your addon, make sure to make it prope
 Next, define functions that contain the data of the extension you would like to include. Write those functions for each type you want to include extensions for. Currently implemented are:
 
 ```
+pre_export_hook(self, export_settings)
+post_export_hook(self, export_settings)
 gather_animation_channel_hook(self, gltf2_animation_channel, channel, blender_object, bone, action_name, node_channel_is_animated, export_settings)
 gather_animation_channel_target_hook(self, gltf2_animation_channel_target, channels, blender_object, bake_bone, bake_channel, export_settings)
 gather_animation_sampler_hook(self, gltf2_sampler, blender_object, bone, action_name, node_channel_is_animated, export_settings)