Improve editor template workflow

Co-Authored-By: jmb462 <jmb462@gmail.com>

5 files changed, 481 insertions, 316 deletions

diff --git a/editor/editor_settings.cpp b/editor/editor_settings.cpp
index 1ac1d6f048..fabf497d9c 100644
--- a/editor/editor_settings.cpp
+++ b/editor/editor_settings.cpp
@@ -781,43 +781,6 @@ bool EditorSettings::_is_default_text_editor_theme(String p_theme_name) {
 	return p_theme_name == "default" || p_theme_name == "godot 2" || p_theme_name == "custom";
 }
 
-static Dictionary _get_builtin_script_templates() {
-	Dictionary templates;
-
-	// No Comments
-	templates["no_comments.gd"] =
-			"extends %BASE%\n"
-			"\n"
-			"\n"
-			"func _ready()%VOID_RETURN%:\n"
-			"%TS%pass\n";
-
-	// Empty
-	templates["empty.gd"] =
-			"extends %BASE%"
-			"\n"
-			"\n";
-
-	return templates;
-}
-
-static void _create_script_templates(const String &p_path) {
-	Dictionary templates = _get_builtin_script_templates();
-	List<Variant> keys;
-	templates.get_key_list(&keys);
-	FileAccessRef file = FileAccess::create(FileAccess::ACCESS_FILESYSTEM);
-	DirAccessRef dir = DirAccess::create(DirAccess::ACCESS_FILESYSTEM);
-	dir->change_dir(p_path);
-	for (int i = 0; i < keys.size(); i++) {
-		if (!dir->file_exists(keys[i])) {
-			Error err = file->reopen(p_path.plus_file((String)keys[i]), FileAccess::WRITE);
-			ERR_FAIL_COND(err != OK);
-			file->store_string(templates[keys[i]]);
-			file->close();
-		}
-	}
-}
-
 // PUBLIC METHODS
 
 EditorSettings *EditorSettings::get_singleton() {
@@ -852,10 +815,7 @@ void EditorSettings::create() {
 	}
 
 	if (EditorPaths::get_singleton()->are_paths_valid()) {
-		_create_script_templates(EditorPaths::get_singleton()->get_config_dir().plus_file("script_templates"));
-
 		// Validate editor config file.
-
 		DirAccessRef dir = DirAccess::open(EditorPaths::get_singleton()->get_config_dir());
 		String config_file_name = "editor_settings-" + itos(VERSION_MAJOR) + ".tres";
 		config_file_path = EditorPaths::get_singleton()->get_config_dir().plus_file(config_file_name);
diff --git a/editor/plugin_config_dialog.cpp b/editor/plugin_config_dialog.cpp
index ad22aafb2b..e6e53d2e29 100644
--- a/editor/plugin_config_dialog.cpp
+++ b/editor/plugin_config_dialog.cpp
@@ -36,12 +36,6 @@
 #include "editor/editor_plugin.h"
 #include "editor/editor_scale.h"
 #include "editor/project_settings_editor.h"
-#include "scene/gui/grid_container.h"
-
-#include "modules/modules_enabled.gen.h" // For gdscript.
-#ifdef MODULE_GDSCRIPT_ENABLED
-#include "modules/gdscript/gdscript.h"
-#endif
 
 void PluginConfigDialog::_clear_fields() {
 	name_edit->set_text("");
@@ -76,42 +70,16 @@ void PluginConfigDialog::_on_confirmed() {
 		String lang_name = ScriptServer::get_language(lang_idx)->get_name();
 
 		Ref<Script> script;
-
-		// TODO Use script templates. Right now, this code won't add the 'tool' annotation to other languages.
-		// TODO Better support script languages with named classes (has_named_classes).
-
-		// FIXME: It's hacky to have hardcoded access to the GDScript module here.
-		// The editor code should not have to know what languages are enabled.
-#ifdef MODULE_GDSCRIPT_ENABLED
-		if (lang_name == GDScriptLanguage::get_singleton()->get_name()) {
-			// Hard-coded GDScript template to keep usability until we use script templates.
-			Ref<Script> gdscript = memnew(GDScript);
-			gdscript->set_source_code(
-					"@tool\n"
-					"extends EditorPlugin\n"
-					"\n"
-					"\n"
-					"func _enter_tree()%VOID_RETURN%:\n"
-					"%TS%pass\n"
-					"\n"
-					"\n"
-					"func _exit_tree()%VOID_RETURN%:\n"
-					"%TS%pass\n");
-			GDScriptLanguage::get_singleton()->make_template("", "", gdscript);
-			String script_path = path.plus_file(script_edit->get_text());
-			gdscript->set_path(script_path);
-			ResourceSaver::save(script_path, gdscript);
-			script = gdscript;
-		} else {
-#endif
-			String script_path = path.plus_file(script_edit->get_text());
-			String class_name = script_path.get_file().get_basename();
-			script = ScriptServer::get_language(lang_idx)->get_template(class_name, "EditorPlugin");
-			script->set_path(script_path);
-			ResourceSaver::save(script_path, script);
-#ifdef MODULE_GDSCRIPT_ENABLED
+		String script_path = path.plus_file(script_edit->get_text());
+		String class_name = script_path.get_file().get_basename();
+		String template_content = "";
+		Vector<ScriptLanguage::ScriptTemplate> templates = ScriptServer::get_language(lang_idx)->get_built_in_templates("EditorPlugin");
+		if (templates.size() > 0) {
+			template_content = templates.get(0).content;
 		}
-#endif
+		script = ScriptServer::get_language(lang_idx)->make_template(template_content, class_name, "EditorPlugin");
+		script->set_path(script_path);
+		ResourceSaver::save(script_path, script);
 
 		emit_signal(SNAME("plugin_ready"), script.operator->(), active_edit->is_pressed() ? _to_absolute_plugin_path(subfolder_edit->get_text()) : "");
 	} else {
@@ -331,11 +299,9 @@ PluginConfigDialog::PluginConfigDialog() {
 	for (int i = 0; i < ScriptServer::get_language_count(); i++) {
 		ScriptLanguage *lang = ScriptServer::get_language(i);
 		script_option_edit->add_item(lang->get_name());
-#ifdef MODULE_GDSCRIPT_ENABLED
-		if (lang == GDScriptLanguage::get_singleton()) {
+		if (lang->get_name() == "GDScript") {
 			default_lang = i;
 		}
-#endif
 	}
 	script_option_edit->select(default_lang);
 	grid->add_child(script_option_edit);
diff --git a/editor/script_create_dialog.cpp b/editor/script_create_dialog.cpp
index 0e96a1d247..a1e3f5aabe 100644
--- a/editor/script_create_dialog.cpp
+++ b/editor/script_create_dialog.cpp
@@ -33,7 +33,6 @@
 #include "core/config/project_settings.h"
 #include "core/io/file_access.h"
 #include "core/io/resource_saver.h"
-#include "core/object/script_language.h"
 #include "core/string/string_builder.h"
 #include "editor/create_dialog.h"
 #include "editor/editor_node.h"
@@ -45,17 +44,16 @@ void ScriptCreateDialog::_notification(int p_what) {
 		case NOTIFICATION_ENTER_TREE:
 		case NOTIFICATION_THEME_CHANGED: {
 			for (int i = 0; i < ScriptServer::get_language_count(); i++) {
-				String lang = ScriptServer::get_language(i)->get_type();
-				Ref<Texture2D> lang_icon = get_theme_icon(lang, SNAME("EditorIcons"));
-				if (lang_icon.is_valid()) {
-					language_menu->set_item_icon(i, lang_icon);
+				Ref<Texture2D> language_icon = get_theme_icon(ScriptServer::get_language(i)->get_type(), SNAME("EditorIcons"));
+				if (language_icon.is_valid()) {
+					language_menu->set_item_icon(i, language_icon);
 				}
 			}
 
-			String last_lang = EditorSettings::get_singleton()->get_project_metadata("script_setup", "last_selected_language", "");
-			if (!last_lang.is_empty()) {
+			String last_language = EditorSettings::get_singleton()->get_project_metadata("script_setup", "last_selected_language", "");
+			if (!last_language.is_empty()) {
 				for (int i = 0; i < language_menu->get_item_count(); i++) {
-					if (language_menu->get_item_text(i) == last_lang) {
+					if (language_menu->get_item_text(i) == last_language) {
 						language_menu->select(i);
 						current_language = i;
 						break;
@@ -64,6 +62,10 @@ void ScriptCreateDialog::_notification(int p_what) {
 			} else {
 				language_menu->select(default_language);
 			}
+			if (EditorSettings::get_singleton()->has_meta("script_setup/use_script_templates")) {
+				is_using_templates = bool(EditorSettings::get_singleton()->get_meta("script_setup/use_script_templates"));
+				use_templates->set_pressed(is_using_templates);
+			}
 
 			path_button->set_icon(get_theme_icon(SNAME("Folder"), SNAME("EditorIcons")));
 			parent_browse_button->set_icon(get_theme_icon(SNAME("Folder"), SNAME("EditorIcons")));
@@ -114,7 +116,7 @@ void ScriptCreateDialog::config(const String &p_base_name, const String &p_base_
 	built_in_enabled = p_built_in_enabled;
 	load_enabled = p_load_enabled;
 
-	_lang_changed(current_language);
+	_language_changed(current_language);
 	_class_name_changed("");
 	_path_changed(file_path->get_text());
 }
@@ -145,8 +147,9 @@ bool ScriptCreateDialog::_validate_class(const String &p_string) {
 
 	for (int i = 0; i < p_string.length(); i++) {
 		if (i == 0) {
+			// Cannot start with a number.
 			if (p_string[0] >= '0' && p_string[0] <= '9') {
-				return false; // no start with number plz
+				return false;
 			}
 		}
 
@@ -170,6 +173,10 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 		return TTR("Filename is empty.");
 	}
 
+	if (!p.get_file().get_basename().is_valid_filename()) {
+		return TTR("Filename is invalid.");
+	}
+
 	p = ProjectSettings::get_singleton()->localize_path(p);
 	if (!p.begins_with("res://")) {
 		return TTR("Path is not local.");
@@ -178,11 +185,11 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	DirAccess *d = DirAccess::create(DirAccess::ACCESS_RESOURCES);
 	if (d->change_dir(p.get_base_dir()) != OK) {
 		memdelete(d);
-		return TTR("Invalid base path.");
+		return TTR("Base path is invalid.");
 	}
 	memdelete(d);
 
-	/* Does file already exist */
+	// Check if file exists.
 	DirAccess *f = DirAccess::create(DirAccess::ACCESS_RESOURCES);
 	if (f->dir_exists(p)) {
 		memdelete(f);
@@ -193,11 +200,11 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	}
 	memdelete(f);
 
-	/* Check file extension */
+	// Check file extension.
 	String extension = p.get_extension();
 	List<String> extensions;
 
-	// get all possible extensions for script
+	// Get all possible extensions for script.
 	for (int l = 0; l < language_menu->get_item_count(); l++) {
 		ScriptServer::get_language(l)->get_recognized_extensions(&extensions);
 	}
@@ -207,8 +214,6 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 	int index = 0;
 	for (const String &E : extensions) {
 		if (E.nocasecmp_to(extension) == 0) {
-			//FIXME (?) - changing language this way doesn't update controls, needs rework
-			//language_menu->select(index); // change Language option by extension
 			found = true;
 			if (E == ScriptServer::get_language(language_menu->get_selected())->get_extension()) {
 				match = true;
@@ -222,16 +227,16 @@ String ScriptCreateDialog::_validate_path(const String &p_path, bool p_file_must
 		return TTR("Invalid extension.");
 	}
 	if (!match) {
-		return TTR("Wrong extension chosen.");
+		return TTR("Extension doesn't match chosen language.");
 	}
 
-	/* Let ScriptLanguage do custom validation */
+	// Let ScriptLanguage do custom validation.
 	String path_error = ScriptServer::get_language(language_menu->get_selected())->validate_path(p);
 	if (!path_error.is_empty()) {
 		return path_error;
 	}
 
-	/* All checks passed */
+	// All checks passed.
 	return "";
 }
 
@@ -244,40 +249,49 @@ String ScriptCreateDialog::_get_class_name() const {
 }
 
 void ScriptCreateDialog::_class_name_changed(const String &p_name) {
-	if (_validate_class(class_name->get_text())) {
-		is_class_name_valid = true;
-	} else {
-		is_class_name_valid = false;
-	}
+	is_class_name_valid = _validate_class(class_name->get_text());
 	_update_dialog();
 }
 
 void ScriptCreateDialog::_parent_name_changed(const String &p_parent) {
-	if (_validate_parent(parent_name->get_text())) {
-		is_parent_name_valid = true;
-	} else {
-		is_parent_name_valid = false;
-	}
+	is_parent_name_valid = _validate_parent(parent_name->get_text());
 	_update_dialog();
 }
 
 void ScriptCreateDialog::_template_changed(int p_template) {
-	String selected_template = p_template == 0 ? "" : template_menu->get_item_text(p_template);
-	EditorSettings::get_singleton()->set_project_metadata("script_setup", "last_selected_template", selected_template);
-	if (p_template == 0) {
-		//default
-		script_template = "";
-		return;
-	}
-	int selected_id = template_menu->get_selected_id();
-
-	for (int i = 0; i < template_list.size(); i++) {
-		const ScriptTemplateInfo &sinfo = template_list[i];
-		if (sinfo.id == selected_id) {
-			script_template = sinfo.dir.plus_file(sinfo.name + "." + sinfo.extension);
-			break;
+	const ScriptLanguage::ScriptTemplate &sinfo = _get_current_template();
+	// Update last used dictionaries
+	if (is_using_templates && !parent_name->get_text().begins_with("\"res:")) {
+		if (sinfo.origin == ScriptLanguage::TemplateLocation::TEMPLATE_PROJECT) {
+			// Save the last used template for this node into the project dictionary.
+			Dictionary dic_templates_project = EditorSettings::get_singleton()->get_project_metadata("script_setup", "templates_dictionary", Dictionary());
+			dic_templates_project[parent_name->get_text()] = sinfo.get_hash();
+			EditorSettings::get_singleton()->set_project_metadata("script_setup", "templates_dictionary", dic_templates_project);
+		} else {
+			// Save template into to editor dictionary (not a project template).
+			Dictionary dic_templates;
+			if (EditorSettings::get_singleton()->has_meta("script_setup/templates_dictionary")) {
+				dic_templates = (Dictionary)EditorSettings::get_singleton()->get_meta("script_setup/templates_dictionary");
+			}
+			dic_templates[parent_name->get_text()] = sinfo.get_hash();
+			EditorSettings::get_singleton()->set_meta("script_setup/templates_dictionary", dic_templates);
+			// Remove template from project dictionary as we last used an editor level template.
+			Dictionary dic_templates_project = EditorSettings::get_singleton()->get_project_metadata("script_setup", "templates_dictionary", Dictionary());
+			if (dic_templates_project.has(parent_name->get_text())) {
+				dic_templates_project.erase(parent_name->get_text());
+				EditorSettings::get_singleton()->set_project_metadata("script_setup", "templates_dictionary", dic_templates_project);
+			}
 		}
 	}
+	// Update template label information.
+	String template_info = String::utf8("•  ");
+	template_info += TTR("Template:");
+	template_info += " " + sinfo.name;
+	if (!sinfo.description.is_empty()) {
+		template_info += " - " + sinfo.description;
+	}
+	template_info_label->set_text(template_info);
+	template_info_label->add_theme_color_override("font_color", get_theme_color(SNAME("success_color"), SNAME("Editor")));
 }
 
 void ScriptCreateDialog::ok_pressed() {
@@ -287,6 +301,7 @@ void ScriptCreateDialog::ok_pressed() {
 		_load_exist();
 	}
 
+	EditorSettings::get_singleton()->save();
 	is_new_script_created = true;
 	_update_dialog();
 }
@@ -295,18 +310,10 @@ void ScriptCreateDialog::_create_new() {
 	String cname_param = _get_class_name();
 
 	Ref<Script> scr;
-	if (!script_template.is_empty()) {
-		scr = ResourceLoader::load(script_template);
-		if (scr.is_null()) {
-			alert->set_text(vformat(TTR("Error loading template '%s'"), script_template));
-			alert->popup_centered();
-			return;
-		}
-		scr = scr->duplicate();
-		ScriptServer::get_language(language_menu->get_selected())->make_template(cname_param, parent_name->get_text(), scr);
-	} else {
-		scr = ScriptServer::get_language(language_menu->get_selected())->get_template(cname_param, parent_name->get_text());
-	}
+
+	const ScriptLanguage::ScriptTemplate sinfo = _get_current_template();
+
+	scr = ScriptServer::get_language(language_menu->get_selected())->make_template(sinfo.content, cname_param, parent_name->get_text());
 
 	if (has_named_classes) {
 		String cname = class_name->get_text();
@@ -345,8 +352,20 @@ void ScriptCreateDialog::_load_exist() {
 	hide();
 }
 
-void ScriptCreateDialog::_lang_changed(int l) {
-	ScriptLanguage *language = ScriptServer::get_language(l);
+Vector<String> ScriptCreateDialog::get_hierarchy(String p_object) const {
+	Vector<String> hierachy;
+	hierachy.append(p_object);
+
+	String parent_class = ClassDB::get_parent_class(p_object);
+	while (parent_class.is_valid_identifier()) {
+		hierachy.append(parent_class);
+		parent_class = ClassDB::get_parent_class(parent_class);
+	}
+	return hierachy;
+}
+
+void ScriptCreateDialog::_language_changed(int l) {
+	language = ScriptServer::get_language(l);
 
 	has_named_classes = language->has_named_classes();
 	can_inherit_from_file = language->can_inherit_from_file();
@@ -364,13 +383,13 @@ void ScriptCreateDialog::_lang_changed(int l) {
 		}
 
 		if (extension.length() == 0) {
-			// add extension if none
+			// Add extension if none.
 			path += selected_ext;
 			_path_changed(path);
 		} else {
-			// change extension by selected language
+			// Change extension by selected language.
 			List<String> extensions;
-			// get all possible extensions for script
+			// Get all possible extensions for script.
 			for (int m = 0; m < language_menu->get_item_count(); m++) {
 				ScriptServer::get_language(m)->get_recognized_extensions(&extensions);
 			}
@@ -389,123 +408,12 @@ void ScriptCreateDialog::_lang_changed(int l) {
 	}
 	file_path->set_text(path);
 
-	bool use_templates = language->is_using_templates();
-	template_menu->set_disabled(!use_templates);
-	template_menu->clear();
-
-	if (use_templates) {
-		_update_script_templates(language->get_extension());
-
-		String last_lang = EditorSettings::get_singleton()->get_project_metadata("script_setup", "last_selected_language", "");
-		String last_template = EditorSettings::get_singleton()->get_project_metadata("script_setup", "last_selected_template", "");
-
-		template_menu->add_item(TTR("Default"));
-
-		ScriptTemplateInfo *templates = template_list.ptrw();
-
-		Vector<String> origin_names;
-		origin_names.push_back(TTR("Project"));
-		origin_names.push_back(TTR("Editor"));
-		int cur_origin = -1;
-
-		// Populate script template items previously sorted and now grouped by origin
-		for (int i = 0; i < template_list.size(); i++) {
-			if (int(templates[i].origin) != cur_origin) {
-				template_menu->add_separator();
-
-				String origin_name = origin_names[templates[i].origin];
-
-				int last_index = template_menu->get_item_count() - 1;
-				template_menu->set_item_text(last_index, origin_name);
-
-				cur_origin = templates[i].origin;
-			}
-			String item_name = templates[i].name.capitalize();
-			template_menu->add_item(item_name);
-
-			int new_id = template_menu->get_item_count() - 1;
-			templates[i].id = new_id;
-		}
-		// Disable overridden
-		for (const KeyValue<String, Vector<int>> &E : template_overrides) {
-			const Vector<int> &overrides = E.value;
-
-			if (overrides.size() == 1) {
-				continue; // doesn't override anything
-			}
-			const ScriptTemplateInfo &extended = template_list[overrides[0]];
-
-			StringBuilder override_info;
-			override_info += TTR("Overrides");
-			override_info += ": ";
-
-			for (int i = 1; i < overrides.size(); i++) {
-				const ScriptTemplateInfo &overridden = template_list[overrides[i]];
-
-				int disable_index = template_menu->get_item_index(overridden.id);
-				template_menu->set_item_disabled(disable_index, true);
-
-				override_info += origin_names[overridden.origin];
-				if (i < overrides.size() - 1) {
-					override_info += ", ";
-				}
-			}
-			template_menu->set_item_icon(extended.id, get_theme_icon(SNAME("Override"), SNAME("EditorIcons")));
-			template_menu->get_popup()->set_item_tooltip(extended.id, override_info.as_string());
-		}
-		// Reselect last selected template
-		for (int i = 0; i < template_menu->get_item_count(); i++) {
-			const String &ti = template_menu->get_item_text(i);
-			if (language_menu->get_item_text(language_menu->get_selected()) == last_lang && last_template == ti) {
-				template_menu->select(i);
-				break;
-			}
-		}
-	} else {
-		template_menu->add_item(TTR("N/A"));
-		script_template = "";
-	}
-
-	_template_changed(template_menu->get_selected());
 	EditorSettings::get_singleton()->set_project_metadata("script_setup", "last_selected_language", language_menu->get_item_text(language_menu->get_selected()));
 
 	_parent_name_changed(parent_name->get_text());
 	_update_dialog();
 }
 
-void ScriptCreateDialog::_update_script_templates(const String &p_extension) {
-	template_list.clear();
-	template_overrides.clear();
-
-	Vector<String> dirs;
-
-	// Ordered from local to global for correct override mechanism
-	dirs.push_back(EditorSettings::get_singleton()->get_project_script_templates_dir());
-	dirs.push_back(EditorSettings::get_singleton()->get_script_templates_dir());
-
-	for (int i = 0; i < dirs.size(); i++) {
-		Vector<String> list = EditorSettings::get_singleton()->get_script_templates(p_extension, dirs[i]);
-
-		for (int j = 0; j < list.size(); j++) {
-			ScriptTemplateInfo sinfo;
-			sinfo.origin = ScriptOrigin(i);
-			sinfo.dir = dirs[i];
-			sinfo.name = list[j];
-			sinfo.extension = p_extension;
-			template_list.push_back(sinfo);
-
-			if (!template_overrides.has(sinfo.name)) {
-				Vector<int> overrides;
-				overrides.push_back(template_list.size() - 1); // first one
-				template_overrides.insert(sinfo.name, overrides);
-			} else {
-				Vector<int> &overrides = template_overrides[sinfo.name];
-				overrides.push_back(template_list.size() - 1);
-			}
-		}
-	}
-}
-
 void ScriptCreateDialog::_built_in_pressed() {
 	if (internal->is_pressed()) {
 		is_built_in = true;
@@ -517,6 +425,12 @@ void ScriptCreateDialog::_built_in_pressed() {
 	_update_dialog();
 }
 
+void ScriptCreateDialog::_use_template_pressed() {
+	is_using_templates = use_templates->is_pressed();
+	EditorSettings::get_singleton()->set_meta("script_setup/use_script_templates", is_using_templates);
+	_update_dialog();
+}
+
 void ScriptCreateDialog::_browse_path(bool browse_parent, bool p_save) {
 	is_browsing_parent = browse_parent;
 
@@ -545,16 +459,16 @@ void ScriptCreateDialog::_browse_path(bool browse_parent, bool p_save) {
 }
 
 void ScriptCreateDialog::_file_selected(const String &p_file) {
-	String p = ProjectSettings::get_singleton()->localize_path(p_file);
+	String path = ProjectSettings::get_singleton()->localize_path(p_file);
 	if (is_browsing_parent) {
-		parent_name->set_text("\"" + p + "\"");
+		parent_name->set_text("\"" + path + "\"");
 		_parent_name_changed(parent_name->get_text());
 	} else {
-		file_path->set_text(p);
-		_path_changed(p);
+		file_path->set_text(path);
+		_path_changed(path);
 
-		String filename = p.get_file().get_basename();
-		int select_start = p.rfind(filename);
+		String filename = path.get_file().get_basename();
+		int select_start = path.rfind(filename);
 		file_path->select(select_start, select_start + filename.length());
 		file_path->set_caret_column(select_start + filename.length());
 		file_path->grab_focus();
@@ -588,7 +502,7 @@ void ScriptCreateDialog::_path_changed(const String &p_path) {
 		return;
 	}
 
-	/* Does file already exist */
+	// Check if file exists.
 	DirAccess *f = DirAccess::create(DirAccess::ACCESS_RESOURCES);
 	String p = ProjectSettings::get_singleton()->localize_path(p_path.strip_edges());
 	if (f->file_exists(p)) {
@@ -623,9 +537,98 @@ void ScriptCreateDialog::_msg_path_valid(bool valid, const String &p_msg) {
 	}
 }
 
-void ScriptCreateDialog::_update_dialog() {
-	/* "Add Script Dialog" GUI logic and script checks. */
+void ScriptCreateDialog::_update_template_menu() {
+	bool is_language_using_templates = language->is_using_templates();
+	template_menu->set_disabled(false);
+	template_menu->clear();
+	template_list.clear();
 
+	if (is_language_using_templates) {
+		// Get the lastest templates used for each type of node from project settings then global settings.
+		Dictionary last_local_templates = EditorSettings::get_singleton()->get_project_metadata("script_setup", "templates_dictionary", Dictionary());
+		Dictionary last_global_templates;
+		if (EditorSettings::get_singleton()->has_meta("script_setup/templates_dictionary")) {
+			last_global_templates = (Dictionary)EditorSettings::get_singleton()->get_meta("script_setup/templates_dictionary");
+		}
+		String inherits_base_type = parent_name->get_text();
+
+		// If it inherits from a script, select Object instead.
+		if (inherits_base_type[0] == '"') {
+			inherits_base_type = "Object";
+		}
+
+		// Get all ancestor node for selected base node.
+		// There templates will also fit the base node.
+		Vector<String> hierarchy = get_hierarchy(inherits_base_type);
+		int last_used_template = -1;
+		int preselected_template = -1;
+		int previous_ancestor_level = -1;
+
+		// Templates can be stored in tree different locations.
+		Vector<ScriptLanguage::TemplateLocation> template_locations;
+		template_locations.append(ScriptLanguage::TEMPLATE_PROJECT);
+		template_locations.append(ScriptLanguage::TEMPLATE_EDITOR);
+		template_locations.append(ScriptLanguage::TEMPLATE_BUILT_IN);
+
+		for (const ScriptLanguage::TemplateLocation &template_location : template_locations) {
+			String display_name = _get_script_origin_label(template_location);
+			bool separator = false;
+			int ancestor_level = 0;
+			for (const String &current_node : hierarchy) {
+				Vector<ScriptLanguage::ScriptTemplate> templates_found;
+				if (template_location == ScriptLanguage::TEMPLATE_BUILT_IN) {
+					templates_found = language->get_built_in_templates(current_node);
+				} else {
+					String template_directory;
+					if (template_location == ScriptLanguage::TEMPLATE_PROJECT) {
+						template_directory = EditorSettings::get_singleton()->get_project_script_templates_dir();
+					} else {
+						template_directory = EditorSettings::get_singleton()->get_script_templates_dir();
+					}
+					templates_found = _get_user_templates(language, current_node, template_directory, template_location);
+				}
+				if (!templates_found.is_empty()) {
+					if (!separator) {
+						template_menu->add_separator();
+						template_menu->set_item_text(template_menu->get_item_count() - 1, display_name);
+						separator = true;
+					}
+					for (ScriptLanguage::ScriptTemplate &t : templates_found) {
+						template_menu->add_item(t.inherit + ": " + t.name);
+						int id = template_menu->get_item_count() - 1;
+						// Check if this template should be preselected if node isn't in the last used dictionary.
+						if (ancestor_level < previous_ancestor_level || previous_ancestor_level == -1) {
+							previous_ancestor_level = ancestor_level;
+							preselected_template = id;
+						}
+						// Check for last used template for this node in project settings then in global settings.
+						if (last_local_templates.has(parent_name->get_text()) && t.get_hash() == String(last_local_templates[parent_name->get_text()])) {
+							last_used_template = id;
+						} else if (last_used_template == -1 && last_global_templates.has(parent_name->get_text()) && t.get_hash() == String(last_global_templates[parent_name->get_text()])) {
+							last_used_template = id;
+						}
+						t.id = id;
+						template_list.push_back(t);
+						String icon = has_theme_icon(t.inherit, SNAME("EditorIcons")) ? t.inherit : "Object";
+						template_menu->set_item_icon(id, get_theme_icon(icon, SNAME("EditorIcons")));
+					}
+				}
+				ancestor_level++;
+			}
+		}
+
+		if (last_used_template != -1) {
+			template_menu->select(last_used_template);
+		} else if (preselected_template != -1) {
+			template_menu->select(preselected_template);
+		}
+	}
+	_template_changed(template_menu->get_selected());
+}
+
+void ScriptCreateDialog::_update_dialog() {
+	// "Add Script Dialog" GUI logic and script checks.
+	_update_template_menu();
 	bool script_ok = true;
 
 	// Is script path/name valid (order from top to bottom)?
@@ -697,41 +700,51 @@ void ScriptCreateDialog::_update_dialog() {
 	// This warning isn't relevant if the script is built-in.
 	script_name_warning_label->set_visible(!is_built_in && _get_class_name() == parent_name->get_text());
 
-	if (is_built_in) {
-		get_ok_button()->set_text(TTR("Create"));
-		parent_name->set_editable(true);
-		parent_search_button->set_disabled(false);
-		parent_browse_button->set_disabled(!can_inherit_from_file);
-		_msg_path_valid(true, TTR("Built-in script (into scene file)."));
-	} else if (is_new_script_created) {
-		// New script created.
-
-		get_ok_button()->set_text(TTR("Create"));
-		parent_name->set_editable(true);
-		parent_search_button->set_disabled(false);
-		parent_browse_button->set_disabled(!can_inherit_from_file);
-		if (is_path_valid) {
+	bool is_new_file = is_built_in || is_new_script_created;
+
+	parent_name->set_editable(is_new_file);
+	parent_search_button->set_disabled(!is_new_file);
+	parent_browse_button->set_disabled(!is_new_file || !can_inherit_from_file);
+	template_inactive_message = "";
+	String button_text = is_new_file ? TTR("Create") : TTR("Load");
+	get_ok_button()->set_text(button_text);
+
+	if (is_new_file) {
+		if (is_built_in) {
+			_msg_path_valid(true, TTR("Built-in script (into scene file)."));
+		}
+		if (is_new_script_created && is_path_valid) {
 			_msg_path_valid(true, TTR("Will create a new script file."));
 		}
-	} else if (load_enabled) {
-		// Script loaded.
-
-		get_ok_button()->set_text(TTR("Load"));
-		parent_name->set_editable(false);
-		parent_search_button->set_disabled(true);
-		parent_browse_button->set_disabled(true);
-		if (is_path_valid) {
-			_msg_path_valid(true, TTR("Will load an existing script file."));
+	} else {
+		if (load_enabled) {
+			template_inactive_message = TTR("Using existing script file.");
+			if (is_path_valid) {
+				_msg_path_valid(true, TTR("Will load an existing script file."));
+			}
+		} else {
+			template_inactive_message = TTR("Using existing script file.");
+			_msg_path_valid(false, TTR("Script file already exists."));
+			script_ok = false;
+		}
+	}
+
+	// Show templates list if needed.
+	if (is_using_templates) {
+		// Check if at least one suitable template has been found.
+		if (template_menu->get_item_count() == 0 && template_inactive_message.is_empty()) {
+			template_inactive_message = TTR("No suitable template.");
 		}
 	} else {
-		get_ok_button()->set_text(TTR("Create"));
-		parent_name->set_editable(true);
-		parent_search_button->set_disabled(false);
-		parent_browse_button->set_disabled(!can_inherit_from_file);
-		_msg_path_valid(false, TTR("Script file already exists."));
+		template_inactive_message = TTR("Empty");
+	}
 
-		script_ok = false;
+	if (!template_inactive_message.is_empty()) {
+		template_menu->set_disabled(true);
+		template_menu->clear();
+		template_menu->add_item(template_inactive_message);
 	}
+	template_info_label->set_visible(!template_menu->is_disabled());
 
 	get_ok_button()->set_disabled(!script_ok);
 
@@ -745,6 +758,122 @@ void ScriptCreateDialog::_update_dialog() {
 	}
 }
 
+ScriptLanguage::ScriptTemplate ScriptCreateDialog::_get_current_template() const {
+	int selected_id = template_menu->get_selected_id();
+	for (const ScriptLanguage::ScriptTemplate &t : template_list) {
+		if (is_using_templates) {
+			if (t.id == selected_id) {
+				return t;
+			}
+		} else {
+			// Using empty built-in template if templates are disabled.
+			if (t.origin == ScriptLanguage::TemplateLocation::TEMPLATE_BUILT_IN && t.name == "Empty") {
+				return t;
+			}
+		}
+	}
+	return ScriptLanguage::ScriptTemplate();
+}
+
+Vector<ScriptLanguage::ScriptTemplate> ScriptCreateDialog::_get_user_templates(const ScriptLanguage *language, const StringName &p_object, const String &p_dir, const ScriptLanguage::TemplateLocation &p_origin) const {
+	Vector<ScriptLanguage::ScriptTemplate> user_templates;
+	String extension = language->get_extension();
+
+	String dir_path = p_dir.plus_file(p_object);
+
+	DirAccess *d = DirAccess::open(dir_path);
+	if (d) {
+		d->list_dir_begin();
+		String file = d->get_next();
+		while (file != String()) {
+			if (file.get_extension() == extension) {
+				user_templates.append(_parse_template(language, dir_path, file, p_origin, p_object));
+			}
+			file = d->get_next();
+		}
+		d->list_dir_end();
+		memdelete(d);
+	}
+	return user_templates;
+}
+
+ScriptLanguage::ScriptTemplate ScriptCreateDialog::_parse_template(const ScriptLanguage *language, const String &p_path, const String &p_filename, const ScriptLanguage::TemplateLocation &p_origin, const String &p_inherits) const {
+	ScriptLanguage::ScriptTemplate script_template = ScriptLanguage::ScriptTemplate();
+	script_template.origin = p_origin;
+	script_template.inherit = p_inherits;
+	String space_indent = "    ";
+	// Get meta delimiter
+	String meta_delimiter = String();
+	List<String> comment_delimiters;
+	language->get_comment_delimiters(&comment_delimiters);
+	for (const String &script_delimiter : comment_delimiters) {
+		if (script_delimiter.find(" ") == -1) {
+			meta_delimiter = script_delimiter;
+			break;
+		}
+	}
+	String meta_prefix = meta_delimiter + " meta-";
+
+	// Parse file for meta-information and script content
+	Error err;
+	FileAccess *file = FileAccess::open(p_path.plus_file(p_filename), FileAccess::READ, &err);
+	if (!err) {
+		while (!file->eof_reached()) {
+			String line = file->get_line();
+			if (line.begins_with(meta_prefix)) {
+				// Store meta information
+				line = line.substr(meta_prefix.length(), -1);
+				if (line.begins_with("name")) {
+					script_template.name = line.substr(5, -1).strip_edges();
+				}
+				if (line.begins_with("description")) {
+					script_template.description = line.substr(12, -1).strip_edges();
+				}
+				if (line.begins_with("space-indent")) {
+					String indent_value = line.substr(17, -1).strip_edges();
+					if (indent_value.is_valid_int()) {
+						space_indent = "";
+						for (int i = 0; i < indent_value.to_int(); i++) {
+							space_indent += " ";
+						}
+					} else {
+						WARN_PRINT(vformat("Template meta-use_space_indent need to be a valid integer value. Found %s.", indent_value));
+					}
+				}
+			} else {
+				// Store script
+				if (space_indent != "") {
+					line = line.replace(space_indent, "_TS_");
+				}
+				script_template.content += line.replace("\t", "_TS_") + "\n";
+			}
+		}
+		file->close();
+		memdelete(file);
+	}
+
+	script_template.content = script_template.content.lstrip("\n");
+
+	// Get name from file name if no name in meta information
+	if (script_template.name == String()) {
+		script_template.name = p_filename.get_basename().replace("_", " ").capitalize();
+	}
+
+	return script_template;
+}
+
+String ScriptCreateDialog::_get_script_origin_label(const ScriptLanguage::TemplateLocation &p_origin) const {
+	switch (p_origin) {
+		case ScriptLanguage::TEMPLATE_BUILT_IN:
+			return TTR("Built-in");
+		case ScriptLanguage::TEMPLATE_EDITOR:
+			return TTR("Editor");
+		case ScriptLanguage::TEMPLATE_PROJECT:
+			return TTR("Project");
+	}
+	return "";
+}
+
 void ScriptCreateDialog::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("config", "inherits", "path", "built_in_enabled", "load_enabled"), &ScriptCreateDialog::config, DEFVAL(true), DEFVAL(true));
 
@@ -757,7 +886,7 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	GridContainer *gc = memnew(GridContainer);
 	gc->set_columns(2);
 
-	/* Error Messages Field */
+	/* Information Messages Field */
 
 	VBoxContainer *vb = memnew(VBoxContainer);
 
@@ -782,6 +911,10 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	script_name_warning_label->set_autowrap_mode(Label::AUTOWRAP_WORD_SMART);
 	script_name_warning_label->hide();
 
+	template_info_label = memnew(Label);
+	vb->add_child(template_info_label);
+	template_info_label->set_autowrap_mode(Label::AUTOWRAP_WORD_SMART);
+
 	status_panel = memnew(PanelContainer);
 	status_panel->set_h_size_flags(Control::SIZE_FILL);
 	status_panel->set_v_size_flags(Control::SIZE_EXPAND_FILL);
@@ -801,7 +934,7 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	/* Language */
 
 	language_menu = memnew(OptionButton);
-	language_menu->set_custom_minimum_size(Size2(250, 0) * EDSCALE);
+	language_menu->set_custom_minimum_size(Size2(350, 0) * EDSCALE);
 	language_menu->set_h_size_flags(Control::SIZE_EXPAND_FILL);
 	gc->add_child(memnew(Label(TTR("Language:"))));
 	gc->add_child(language_menu);
@@ -819,7 +952,7 @@ ScriptCreateDialog::ScriptCreateDialog() {
 	}
 	current_language = default_language;
 
-	language_menu->connect("item_selected", callable_mp(this, &ScriptCreateDialog::_lang_changed));
+	language_menu->connect("item_selected", callable_mp(this, &ScriptCreateDialog::_language_changed));
 
 	/* Inherits */
 
@@ -851,10 +984,24 @@ ScriptCreateDialog::ScriptCreateDialog() {
 
 	/* Templates */
 
-	template_menu = memnew(OptionButton);
+	is_using_templates = true;
 	gc->add_child(memnew(Label(TTR("Template:"))));
-	gc->add_child(template_menu);
+	HBoxContainer *template_hb = memnew(HBoxContainer);
+	template_hb->set_h_size_flags(Control::SIZE_EXPAND_FILL);
+
+	use_templates = memnew(CheckBox);
+	use_templates->set_pressed(is_using_templates);
+	use_templates->connect("pressed", callable_mp(this, &ScriptCreateDialog::_use_template_pressed));
+	template_hb->add_child(use_templates);
+
+	template_inactive_message = "";
+
+	template_menu = memnew(OptionButton);
+	template_menu->set_h_size_flags(Control::SIZE_EXPAND_FILL);
 	template_menu->connect("item_selected", callable_mp(this, &ScriptCreateDialog::_template_changed));
+	template_hb->add_child(template_menu);
+
+	gc->add_child(template_hb);
 
 	/* Built-in Script */
 
diff --git a/editor/script_create_dialog.h b/editor/script_create_dialog.h
index dba798eea7..2c980f6e6e 100644
--- a/editor/script_create_dialog.h
+++ b/editor/script_create_dialog.h
@@ -31,6 +31,7 @@
 #ifndef SCRIPT_CREATE_DIALOG_H
 #define SCRIPT_CREATE_DIALOG_H
 
+#include "core/object/script_language.h"
 #include "editor/editor_file_dialog.h"
 #include "editor/editor_settings.h"
 #include "scene/gui/check_box.h"
@@ -50,6 +51,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	Label *path_error_label;
 	Label *builtin_warning_label;
 	Label *script_name_warning_label;
+	Label *template_info_label;
 	PanelContainer *status_panel;
 	LineEdit *parent_name;
 	Button *parent_browse_button;
@@ -61,12 +63,14 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	Button *path_button;
 	EditorFileDialog *file_browse;
 	CheckBox *internal;
+	CheckBox *use_templates;
 	VBoxContainer *path_vb;
 	AcceptDialog *alert;
 	CreateDialog *select_class;
 	bool path_valid;
 	bool create_new;
 	bool is_browsing_parent;
+	String template_inactive_message;
 	String initial_bp;
 	bool is_new_script_created;
 	bool is_path_valid;
@@ -76,6 +80,7 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	bool is_parent_name_valid;
 	bool is_class_name_valid;
 	bool is_built_in;
+	bool is_using_templates;
 	bool built_in_enabled;
 	bool load_enabled;
 	int current_language;
@@ -85,23 +90,8 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	Control *path_controls[2];
 	Control *name_controls[2];
 
-	enum ScriptOrigin {
-		SCRIPT_ORIGIN_PROJECT,
-		SCRIPT_ORIGIN_EDITOR,
-	};
-	struct ScriptTemplateInfo {
-		int id = 0;
-		ScriptOrigin origin = ScriptOrigin::SCRIPT_ORIGIN_EDITOR;
-		String dir;
-		String name;
-		String extension;
-	};
-
-	String script_template;
-	Vector<ScriptTemplateInfo> template_list;
-	Map<String, Vector<int>> template_overrides; // name : indices
-
-	void _update_script_templates(const String &p_extension);
+	Vector<ScriptLanguage::ScriptTemplate> template_list;
+	ScriptLanguage *language;
 
 	String base_type;
 
@@ -109,8 +99,9 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	bool _can_be_built_in();
 	void _path_changed(const String &p_path = String());
 	void _path_submitted(const String &p_path = String());
-	void _lang_changed(int l = 0);
+	void _language_changed(int l = 0);
 	void _built_in_pressed();
+	void _use_template_pressed();
 	bool _validate_parent(const String &p_string);
 	bool _validate_class(const String &p_string);
 	String _validate_path(const String &p_path, bool p_file_must_exist);
@@ -125,9 +116,15 @@ class ScriptCreateDialog : public ConfirmationDialog {
 	virtual void ok_pressed() override;
 	void _create_new();
 	void _load_exist();
+	Vector<String> get_hierarchy(String p_object) const;
 	void _msg_script_valid(bool valid, const String &p_msg = String());
 	void _msg_path_valid(bool valid, const String &p_msg = String());
+	void _update_template_menu();
 	void _update_dialog();
+	ScriptLanguage::ScriptTemplate _get_current_template() const;
+	Vector<ScriptLanguage::ScriptTemplate> _get_user_templates(const ScriptLanguage *language, const StringName &p_object, const String &p_dir, const ScriptLanguage::TemplateLocation &p_origin) const;
+	ScriptLanguage::ScriptTemplate _parse_template(const ScriptLanguage *language, const String &p_path, const String &p_filename, const ScriptLanguage::TemplateLocation &p_origin, const String &p_inherits) const;
+	String _get_script_origin_label(const ScriptLanguage::TemplateLocation &p_origin) const;
 
 protected:
 	void _notification(int p_what);
diff --git a/editor/template_builders.py b/editor/template_builders.py
new file mode 100644
index 0000000000..efed567d46
--- /dev/null
+++ b/editor/template_builders.py
@@ -0,0 +1,95 @@
+"""Functions used to generate source files during build time
+All such functions are invoked in a subprocess on Windows to prevent build flakiness.
+"""
+
+import os
+from io import StringIO
+from platform_methods import subprocess_main
+
+
+def parse_template(inherits, source, delimiter):
+    script_template = {
+        "inherits": inherits,
+        "name": "",
+        "description": "",
+        "version": "",
+        "script": "",
+        "space-indent": "4",
+    }
+    meta_prefix = delimiter + " meta-"
+    meta = ["name", "description", "version", "space-indent"]
+
+    with open(source) as f:
+        lines = f.readlines()
+        for line in lines:
+            if line.startswith(meta_prefix):
+                line = line[len(meta_prefix) :]
+                for m in meta:
+                    if line.startswith(m):
+                        strip_lenght = len(m) + 1
+                        script_template[m] = line[strip_lenght:].strip()
+            else:
+                script_template["script"] += line
+        if script_template["space-indent"] != "":
+            indent = " " * int(script_template["space-indent"])
+            script_template["script"] = script_template["script"].replace(indent, "_TS_")
+        if script_template["name"] == "":
+            script_template["name"] = os.path.splitext(os.path.basename(source))[0].replace("_", " ").title()
+        script_template["script"] = (
+            script_template["script"].replace('"', '\\"').lstrip().replace("\n", "\\n").replace("\t", "_TS_")
+        )
+        return (
+            '{ String("'
+            + script_template["inherits"]
+            + '"), String("'
+            + script_template["name"]
+            + '"),  String("'
+            + script_template["description"]
+            + '"),  String("'
+            + script_template["script"]
+            + '")'
+            + " },\n"
+        )
+
+
+def make_templates(target, source, env):
+    dst = target[0]
+    s = StringIO()
+    s.write("/* THIS FILE IS GENERATED DO NOT EDIT */\n\n")
+    s.write("#ifndef _CODE_TEMPLATES_H\n")
+    s.write("#define _CODE_TEMPLATES_H\n\n")
+    s.write('#include "core/object/object.h"\n')
+    s.write('#include "core/object/script_language.h"\n')
+
+    delimiter = "#"  # GDScript single line comment delimiter by default.
+    if source:
+        ext = os.path.splitext(source[0])[1]
+        if ext == ".cs":
+            delimiter = "//"
+
+    parsed_template_string = ""
+    number_of_templates = 0
+
+    for filepath in source:
+        node_name = os.path.basename(os.path.dirname(filepath))
+        parsed_template = parse_template(node_name, filepath, delimiter)
+        parsed_template_string += "\t" + parsed_template
+        number_of_templates += 1
+
+    s.write("\nstatic const int TEMPLATES_ARRAY_SIZE = " + str(number_of_templates) + ";\n")
+    s.write("\nstatic const struct ScriptLanguage::ScriptTemplate TEMPLATES[" + str(number_of_templates) + "] = {\n")
+
+    s.write(parsed_template_string)
+
+    s.write("};\n")
+
+    s.write("\n#endif\n")
+
+    with open(dst, "w") as f:
+        f.write(s.getvalue())
+
+    s.close()
+
+
+if __name__ == "__main__":
+    subprocess_main(globals())