From 9a8421aa058437ce01bc67244bb8dcd0f15fc9e6 Mon Sep 17 00:00:00 2001
From: Francois Belair <razoric480@gmail.com>
Date: Sun, 11 Jul 2021 15:51:31 -0400
Subject: Implement applyEdit in LSP for signal connecting

---
 .../language_server/gdscript_language_protocol.cpp | 17 +++++++
 .../language_server/gdscript_language_protocol.h   |  3 ++
 .../language_server/gdscript_workspace.cpp         | 52 ++++++++++++++++++++++
 .../gdscript/language_server/gdscript_workspace.h  |  2 +
 modules/gdscript/language_server/lsp.hpp           | 52 ++++++++++++++++++++++
 5 files changed, 126 insertions(+)

diff --git a/modules/gdscript/language_server/gdscript_language_protocol.cpp b/modules/gdscript/language_server/gdscript_language_protocol.cpp
index 0d1f98778e..fb60da1ff4 100644
--- a/modules/gdscript/language_server/gdscript_language_protocol.cpp
+++ b/modules/gdscript/language_server/gdscript_language_protocol.cpp
@@ -284,6 +284,23 @@ void GDScriptLanguageProtocol::notify_client(const String &p_method, const Varia
 	peer->res_queue.push_back(msg.utf8());
 }
 
+void GDScriptLanguageProtocol::request_client(const String &p_method, const Variant &p_params, int p_client_id) {
+	if (p_client_id == -1) {
+		ERR_FAIL_COND_MSG(latest_client_id == -1,
+				"GDScript LSP: Can't notify client as none was connected.");
+		p_client_id = latest_client_id;
+	}
+	ERR_FAIL_COND(!clients.has(p_client_id));
+	Ref<LSPeer> peer = clients.get(p_client_id);
+	ERR_FAIL_COND(peer == nullptr);
+
+	Dictionary message = make_request(p_method, p_params, next_server_id);
+	next_server_id++;
+	String msg = Variant(message).to_json_string();
+	msg = format_output(msg);
+	peer->res_queue.push_back(msg.utf8());
+}
+
 bool GDScriptLanguageProtocol::is_smart_resolve_enabled() const {
 	return bool(_EDITOR_GET("network/language_server/enable_smart_resolve"));
 }
diff --git a/modules/gdscript/language_server/gdscript_language_protocol.h b/modules/gdscript/language_server/gdscript_language_protocol.h
index 969c38eab6..ad6c0903c5 100644
--- a/modules/gdscript/language_server/gdscript_language_protocol.h
+++ b/modules/gdscript/language_server/gdscript_language_protocol.h
@@ -73,6 +73,8 @@ private:
 	int latest_client_id = 0;
 	int next_client_id = 0;
 
+	int next_server_id = 0;
+
 	Ref<GDScriptTextDocument> text_document;
 	Ref<GDScriptWorkspace> workspace;
 
@@ -101,6 +103,7 @@ public:
 	void stop();
 
 	void notify_client(const String &p_method, const Variant &p_params = Variant(), int p_client_id = -1);
+	void request_client(const String &p_method, const Variant &p_params = Variant(), int p_client_id = -1);
 
 	bool is_smart_resolve_enabled() const;
 	bool is_goto_native_symbols_enabled() const;
diff --git a/modules/gdscript/language_server/gdscript_workspace.cpp b/modules/gdscript/language_server/gdscript_workspace.cpp
index 1915c92cbf..c0a84d63dc 100644
--- a/modules/gdscript/language_server/gdscript_workspace.cpp
+++ b/modules/gdscript/language_server/gdscript_workspace.cpp
@@ -42,6 +42,7 @@
 #include "scene/resources/packed_scene.h"
 
 void GDScriptWorkspace::_bind_methods() {
+	ClassDB::bind_method(D_METHOD("apply_new_signal"), &GDScriptWorkspace::apply_new_signal);
 	ClassDB::bind_method(D_METHOD("didDeleteFiles"), &GDScriptWorkspace::did_delete_files);
 	ClassDB::bind_method(D_METHOD("symbol"), &GDScriptWorkspace::symbol);
 	ClassDB::bind_method(D_METHOD("parse_script", "path", "content"), &GDScriptWorkspace::parse_script);
@@ -52,6 +53,54 @@ void GDScriptWorkspace::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("generate_script_api", "path"), &GDScriptWorkspace::generate_script_api);
 }
 
+void GDScriptWorkspace::apply_new_signal(Object *obj, String function, PackedStringArray args) {
+	String function_signature = "func " + function;
+	Ref<Script> script = obj->get_script();
+
+	String source = script->get_source_code();
+
+	if (source.find(function_signature) != -1) {
+		return;
+	}
+
+	int first_class = source.find("\nclass ");
+	int start_line = 0;
+	if (first_class != -1) {
+		start_line = source.substr(0, first_class).split("\n").size();
+	} else {
+		start_line = source.split("\n").size();
+	}
+
+	String function_body = "\n\n" + function_signature + "(";
+	for (int i = 0; i < args.size(); ++i) {
+		function_body += args[i];
+		if (i < args.size() - 1) {
+			function_body += ", ";
+		}
+	}
+	function_body += ")";
+	if (EditorSettings::get_singleton()->get_setting("text_editor/completion/add_type_hints")) {
+		function_body += " -> void";
+	}
+	function_body += ":\n\tpass # Replace with function body.\n";
+
+	lsp::TextEdit text_edit;
+
+	if (first_class != -1) {
+		function_body += "\n\n";
+	}
+	text_edit.range.end.line = text_edit.range.start.line = start_line;
+
+	text_edit.newText = function_body;
+
+	String uri = get_file_uri(script->get_path());
+
+	lsp::ApplyWorkspaceEditParams params;
+	params.edit.add_edit(uri, text_edit);
+
+	GDScriptLanguageProtocol::get_singleton()->request_client("workspace/applyEdit", params.to_json());
+}
+
 void GDScriptWorkspace::did_delete_files(const Dictionary &p_params) {
 	Array files = p_params["files"];
 	for (int i = 0; i < files.size(); ++i) {
@@ -325,6 +374,9 @@ Error GDScriptWorkspace::initialize() {
 		}
 	}
 
+	EditorNode *editor_node = EditorNode::get_singleton();
+	editor_node->connect("script_add_function_request", callable_mp(this, &GDScriptWorkspace::apply_new_signal));
+
 	return OK;
 }
 
diff --git a/modules/gdscript/language_server/gdscript_workspace.h b/modules/gdscript/language_server/gdscript_workspace.h
index 8b166a873c..e243aa790e 100644
--- a/modules/gdscript/language_server/gdscript_workspace.h
+++ b/modules/gdscript/language_server/gdscript_workspace.h
@@ -60,6 +60,8 @@ protected:
 
 	void list_script_files(const String &p_root_dir, List<String> &r_files);
 
+	void apply_new_signal(Object *obj, String function, PackedStringArray args);
+
 public:
 	String root;
 	String root_uri;
diff --git a/modules/gdscript/language_server/lsp.hpp b/modules/gdscript/language_server/lsp.hpp
index a7dcfdb22d..025b1f498c 100644
--- a/modules/gdscript/language_server/lsp.hpp
+++ b/modules/gdscript/language_server/lsp.hpp
@@ -1266,6 +1266,58 @@ struct DocumentSymbol {
 	}
 };
 
+struct WorkspaceEdit {
+	HashMap<String, List<TextEdit>> changes;
+
+	void add_edit(String uri, TextEdit edit) {
+		if (changes.has(uri)) {
+			changes[uri].push_back(edit);
+		} else {
+			List<TextEdit> edits;
+			edits.push_back(edit);
+			changes[uri] = edits;
+		}
+	}
+
+	Dictionary to_json() {
+		Dictionary dict;
+
+		Dictionary changes_dict;
+
+		List<String> key_list;
+		changes.get_key_list(&key_list);
+		for (int i = 0; i < key_list.size(); ++i) {
+			String uri = key_list[i];
+
+			List<TextEdit> edits = changes[key_list[i]];
+			Array changes_arr;
+			for (int l = 0; l < edits.size(); ++l) {
+				Dictionary change_dict;
+				change_dict["newText"] = edits[l].newText;
+				change_dict["range"] = edits[l].range.to_json();
+				changes_arr.push_back(change_dict);
+			}
+			changes_dict[uri] = changes_arr;
+		}
+
+		dict["changes"] = changes_dict;
+
+		return dict;
+	}
+};
+
+struct ApplyWorkspaceEditParams {
+	WorkspaceEdit edit;
+
+	Dictionary to_json() {
+		Dictionary dict;
+
+		dict["edit"] = edit.to_json();
+
+		return dict;
+	}
+};
+
 struct NativeSymbolInspectParams {
 	String native_class;
 	String symbol_name;
-- 
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