[iOS] Improve logger.

Stream errors to the Console.app (and highlight in Xcode).
Prevent duplicate prints in Xcode.

platform/ios/SCsub

@@ -20,6 +20,7 @@ ios_lib = [
     "device_metrics.m",
     "keyboard_input_view.mm",
     "key_mapping_ios.mm",
+    "ios_terminal_logger.mm",
 ]
 
 env_ios = env.Clone()

platform/ios/ios_terminal_logger.h

@@ -0,0 +1,45 @@
+/**************************************************************************/
+/*  ios_terminal_logger.h                                                 */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#ifndef IOS_TERMINAL_LOGGER_H
+#define IOS_TERMINAL_LOGGER_H
+
+#ifdef IOS_ENABLED
+
+#include "core/io/logger.h"
+
+class IOSTerminalLogger : public StdLogger {
+public:
+	virtual void log_error(const char *p_function, const char *p_file, int p_line, const char *p_code, const char *p_rationale, bool p_editor_notify = false, ErrorType p_type = ERR_ERROR) override;
+};
+
+#endif // IOS_ENABLED
+
+#endif // IOS_TERMINAL_LOGGER_H

platform/ios/ios_terminal_logger.mm

@@ -0,0 +1,74 @@
+/**************************************************************************/
+/*  ios_terminal_logger.mm                                                */
+/**************************************************************************/
+/*                         This file is part of:                          */
+/*                             GODOT ENGINE                               */
+/*                        https://godotengine.org                         */
+/**************************************************************************/
+/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
+/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
+/*                                                                        */
+/* Permission is hereby granted, free of charge, to any person obtaining  */
+/* a copy of this software and associated documentation files (the        */
+/* "Software"), to deal in the Software without restriction, including    */
+/* without limitation the rights to use, copy, modify, merge, publish,    */
+/* distribute, sublicense, and/or sell copies of the Software, and to     */
+/* permit persons to whom the Software is furnished to do so, subject to  */
+/* the following conditions:                                              */
+/*                                                                        */
+/* The above copyright notice and this permission notice shall be         */
+/* included in all copies or substantial portions of the Software.        */
+/*                                                                        */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,        */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF     */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY   */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,   */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE      */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                 */
+/**************************************************************************/
+
+#include "ios_terminal_logger.h"
+
+#ifdef IOS_ENABLED
+
+#include <os/log.h>
+
+void IOSTerminalLogger::log_error(const char *p_function, const char *p_file, int p_line, const char *p_code, const char *p_rationale, bool p_editor_notify, ErrorType p_type) {
+	if (!should_log(true)) {
+		return;
+	}
+
+	const char *err_details;
+	if (p_rationale && p_rationale[0]) {
+		err_details = p_rationale;
+	} else {
+		err_details = p_code;
+	}
+
+	switch (p_type) {
+		case ERR_WARNING:
+			os_log_info(OS_LOG_DEFAULT,
+					"WARNING: %{public}s\nat: %{public}s (%{public}s:%i)",
+					err_details, p_function, p_file, p_line);
+			break;
+		case ERR_SCRIPT:
+			os_log_error(OS_LOG_DEFAULT,
+					"SCRIPT ERROR: %{public}s\nat: %{public}s (%{public}s:%i)",
+					err_details, p_function, p_file, p_line);
+			break;
+		case ERR_SHADER:
+			os_log_error(OS_LOG_DEFAULT,
+					"SHADER ERROR: %{public}s\nat: %{public}s (%{public}s:%i)",
+					err_details, p_function, p_file, p_line);
+			break;
+		case ERR_ERROR:
+		default:
+			os_log_error(OS_LOG_DEFAULT,
+					"ERROR: %{public}s\nat: %{public}s (%{public}s:%i)",
+					err_details, p_function, p_file, p_line);
+			break;
+	}
+}
+
+#endif // IOS_ENABLED

platform/ios/os_ios.mm

@@ -35,6 +35,7 @@
 #import "app_delegate.h"
 #import "display_server_ios.h"
 #import "godot_view.h"
+#import "ios_terminal_logger.h"
 #import "view_controller.h"
 
 #include "core/config/project_settings.h"
@@ -105,12 +106,7 @@ OS_IOS::OS_IOS() {
 	main_loop = nullptr;
 
 	Vector<Logger *> loggers;
-	loggers.push_back(memnew(SyslogLogger));
-#ifdef DEBUG_ENABLED
-	// it seems iOS app's stdout/stderr is only obtainable if you launch it from
-	// Xcode
-	loggers.push_back(memnew(StdLogger));
-#endif
+	loggers.push_back(memnew(IOSTerminalLogger));
 	_set_logger(memnew(CompositeLogger(loggers)));
 
 	AudioDriverManager::add_driver(&audio_driver);