[Command line export] return 0 exit code when export is finished with warnings.

(cherry picked from commit d02bf7584aa9a679f9bf7d63bd5366ed354022ba)

editor/editor_node.cpp

@@ -749,6 +749,7 @@ void EditorNode::_fs_changed() {
 
 	// FIXME: Move this to a cleaner location, it's hacky to do this is _fs_changed.
 	String export_error;
+	Error err = OK;
 	if (export_defer.preset != "" && !EditorFileSystem::get_singleton()->is_scanning()) {
 		String preset_name = export_defer.preset;
 		// Ensures export_project does not loop infinitely, because notifications may
@@ -766,6 +767,7 @@ void EditorNode::_fs_changed() {
 		if (preset.is_null()) {
 			DirAccessRef da = DirAccess::create(DirAccess::ACCESS_RESOURCES);
 			if (da->file_exists("res://export_presets.cfg")) {
+				err = FAILED;
 				export_error = vformat(
 						"Invalid export preset name: %s.\nThe following presets were detected in this project's `export_presets.cfg`:\n\n",
 						preset_name);
@@ -774,17 +776,19 @@ void EditorNode::_fs_changed() {
 					export_error += vformat("        \"%s\"\n", EditorExport::get_singleton()->get_export_preset(i)->get_name());
 				}
 			} else {
+				err = FAILED;
 				export_error = "This project doesn't have an `export_presets.cfg` file at its root.\nCreate an export preset from the \"Project > Export\" dialog and try again.";
 			}
 		} else {
 			Ref<EditorExportPlatform> platform = preset->get_platform();
 			const String export_path = export_defer.path.empty() ? preset->get_export_path() : export_defer.path;
 			if (export_path.empty()) {
+				err = FAILED;
 				export_error = vformat("Export preset \"%s\" doesn't have a default export path, and none was specified.", preset_name);
 			} else if (platform.is_null()) {
+				err = FAILED;
 				export_error = vformat("Export preset \"%s\" doesn't have a matching platform.", preset_name);
 			} else {
-				Error err = OK;
 				if (export_defer.pack_only) { // Only export .pck or .zip data pack.
 					if (export_path.ends_with(".zip")) {
 						err = platform->export_zip(preset, export_defer.debug, export_path);
@@ -805,14 +809,16 @@ void EditorNode::_fs_changed() {
 				if (err != OK) {
 					export_error = vformat("Project export for preset \"%s\" failed.", preset_name);
 				} else if (platform->get_worst_message_type() >= EditorExportPlatform::EXPORT_MESSAGE_WARNING) {
-					export_error = vformat("Project export for preset \"%s\" completed with errors.", preset_name);
+					export_error = vformat("Project export for preset \"%s\" completed with warnings.", preset_name);
 				}
 			}
 		}
 
-		if (!export_error.empty()) {
+		if (err != OK) {
 			ERR_PRINT(export_error);
 			OS::get_singleton()->set_exit_code(EXIT_FAILURE);
+		} else if (!export_error.empty()) {
+			WARN_PRINT(export_error);
 		}
 		_exit_editor();
 	}