add optional autosave to file content

ServerUI.gd

@@ -7,6 +7,9 @@ const SERVER_STATUS_TEXT: Dictionary = {
 
 const ACCEPTED_FILE_FORMATS := ["md"] # server should ignore these file types when adding endpoints
 
+export(bool) var enable_file_autosave := true # if true, will save the active file's contents every save_file_timeout seconds.
+export(float) var save_file_timeout := 4.0 # the time to save document content after the edited signal of TextEdit
+
 enum ContextMenuOptions {
 	MOVE_UP,
 	MOVE_DOWN,
@@ -147,7 +150,7 @@ func set_server_running(running: bool) -> void:
 	is_server_running = running # TODO: logic for disabling and enabling certain nodes
 
 
-func _generate_filestxt() -> String:
+func _generate_filestxt():
 	var files := ""
 
 	for file in working_files:
@@ -155,7 +158,12 @@ func _generate_filestxt() -> String:
 		if file.include_in_filestxt:
 			files += "%s %s %s\n" % [file.file_path, file.date, file.title]
 
-	return files
+	var f := File.new()
+	if f.open(server_dir.plus_file("files.txt"), File.WRITE) == OK:
+		f.store_string(files)
+		f.close()
+	else:
+		push_error("File.txt open for save error!")
 
 
 func _is_file_in_filestxt(path: String) -> bool:
@@ -229,6 +237,26 @@ func _on_DocInputTextEdit_text_changed() -> void:
 		current_file.content = new_text
 		current_file.dirty = true
 
+		if !current_file.timer:
+			var t := Timer.new()
+			t.wait_time = save_file_timeout
+			t.one_shot = true
+			current_file.timer = t
+			add_child(t)
+			t.connect("timeout", self, "_on_EditedTimeout_timeout", [t, current_file])
+		else:
+			current_file.timer.stop()
+			current_file.timer.start()
+
+
+func _on_EditedTimeout_timeout(timer: Timer, file: FileDef) -> void:
+	file.timer = null
+	timer.queue_free()
+
+	var f := File.new()
+	if f.open(server_dir.plus_file(file.file_path), File.WRITE) == OK:
+		f.store_string(file.content)
+
 
 func FileDef(
 	file_path: String,
@@ -252,3 +280,5 @@ class FileDef:
 	var dirty: bool = false
 
 	var content: String
+
+	var timer: Timer