Add the tomli library and create the config_manager.py to manage the configuration file and also add the dependency injection on the ui.py via the Application class

src/pilgrim/utils/__init__.py

@@ -1,3 +1,4 @@
 from .directory_manager import DirectoryManager
+from .config_manager import ConfigManager
 
-__all__ = ['DirectoryManager']
+__all__ = ['DirectoryManager', 'ConfigManager']

src/pilgrim/utils/config_manager.py

@@ -0,0 +1,35 @@
+from threading import Lock
+
+import tomli
+from pilgrim.utils import DirectoryManager
+
+class SingletonMeta(type):
+    _instances = {}
+    _lock: Lock = Lock()
+
+    def __call__(cls, *args, **kwargs):
+        with cls._lock:
+            if cls not in cls._instances:
+                instance = super().__call__(*args, **kwargs)
+                cls._instances[cls] = instance
+        return cls._instances[cls]
+
+class ConfigManager(metaclass=SingletonMeta):
+    def __init__(self):
+        self.database_url = None
+        self.database_type = None
+        self.auto_open_diary = None
+        self.auto_open_new_diary = None
+    @staticmethod
+    def read_config():
+        try:
+            with open(f"{DirectoryManager.get_config_directory()}/config.toml", "rb") as f:
+                data = tomli.load(f)
+            print(data)
+        except FileNotFoundError:
+            print("Error: config.toml not found.")
+        except tomli.TOMLDecodeError as e:
+            print(f"Error decoding TOML: {e}")
+
+    def set_database_url(self):
+        pass