UI: Sort and pretty-print exported collections

UI/window-basic-main-scene-collections.cpp

@@ -397,10 +397,46 @@ void OBSBasic::on_actionExportSceneCollection_triggered()
 	string file = QT_TO_UTF8(exportFile);
 
 	if (!exportFile.isEmpty() && !exportFile.isNull()) {
-		if (QFile::exists(exportFile))
-			QFile::remove(exportFile);
+		QString inputFile = path + currentFile + ".json";
 
-		QFile::copy(path + currentFile + ".json", exportFile);
+		OBSDataAutoRelease collection =
+			obs_data_create_from_json_file(QT_TO_UTF8(inputFile));
+
+		OBSDataArrayAutoRelease sources =
+			obs_data_get_array(collection, "sources");
+		if (!sources) {
+			blog(LOG_WARNING,
+			     "No sources in exported scene collection");
+			return;
+		}
+		obs_data_erase(collection, "sources");
+
+		// We're just using std::sort on a vector to make life easier.
+		vector<OBSData> sourceItems;
+		obs_data_array_enum(
+			sources,
+			[](obs_data_t *data, void *pVec) -> void {
+				auto &sourceItems =
+					*static_cast<vector<OBSData> *>(pVec);
+				sourceItems.push_back(data);
+			},
+			&sourceItems);
+
+		std::sort(sourceItems.begin(), sourceItems.end(),
+			  [](const OBSData &a, const OBSData &b) {
+				  return astrcmpi(obs_data_get_string(a,
+								      "name"),
+						  obs_data_get_string(
+							  b, "name")) < 0;
+			  });
+
+		OBSDataArrayAutoRelease newSources = obs_data_array_create();
+		for (auto &item : sourceItems)
+			obs_data_array_push_back(newSources, item);
+
+		obs_data_set_array(collection, "sources", newSources);
+		obs_data_save_json_pretty_safe(
+			collection, QT_TO_UTF8(exportFile), "tmp", "bak");
 	}
 }