make config object oriented

config.py

@@ -3,17 +3,19 @@ import tkinter as tk
 from tkinter import ttk
 import gui_helper, util
 
-def load_configuration(default_config, file_path):
+class Config:
+    def __init__(self, file_path, default_config):
+        self.__file_path = file_path
+        self.__default_config = default_config
+        self.__current_config = {}
+
         if os.path.isfile(file_path):
             try:
-            config_file = open(file_path, "r")
-            global configuration
-            configuration = json.loads(config_file.read())
+                config_file = open(self.__file_path, "r")
+                self.__current_config = json.loads(config_file.read())
                 config_file.close()
-            return configuration
-        except Exception:
+            except:
                 util.error("An exception occurred while trying to load the configuration.", handle_gracefully=False)
-            return {}
         else:
             # config not found
             dialog_interaction_handler = gui_helper.Window_Interaction_Handler()
@@ -29,43 +31,43 @@ def load_configuration(default_config, file_path):
             dialog.mainloop()
 
             if dialog_interaction_handler.get_result("create"):
+                self.__current_config = default_config
                 try:
-                config_file = open(file_path, "w")
-                config_file.write(json.dumps(default_config))
+                    config_file = open(self.__file_path, "w")
+                    config_file.write(json.dumps(self.__current_config))
                     config_file.close()
                 except:
                     util.warn("Failed to save initial config file.", is_exception=True)
                     dialog = tk.Tk()
                     dialog.title("Failed to save initial config file")
                     ttk.Label(dialog, text="Failed to save the initial config file.\n" +
-                                "The IDE can still start up, but it is likely that all changes to the configuration will be lost where they would be saved otherwise.").pack()
+                                    "The IDE can still run, but it is likely that all changes to the configuration will be lost where they would be saved otherwise.").pack()
                     ttk.Button(dialog, text="Continue", command=dialog.destroy).pack()
                     dialog.resizable(0,0)
                     dialog.mainloop()
-            return default_config
             else:
                 util.error("No config present and user chose not to create one. Exiting.", is_exception=False, handle_gracefully=True)
                 # exit with success exit code anyway because this is not a program failure
                 sys.exit(util.EXIT_SUCCESS)
 
-def get_configuration_value(config, default_config, key):
-    if not key in config:
+    def get_configuration_value(self, key):
+        if not key in self.__current_config:
             util.info("Requested configuration value for "+str(key)+" not in configuration. Loading from default configuration.")
             try:
-            config[key] = default_config[key]
+                self.__current_config[key] = self.__default_config[key]
             except KeyError:
                 util.error("Requested an invalid configuration key.")
                 return None
-    return config[key]
+        return self.__current_config[key]
 
-def set_configuration_value(file_path, config, key, value, save_to_disk=True):
-    if not key in config:
+    def set_configuration_value(self, key, value, save_to_disk=True):
+        if not key in self.__current_config:
             util.info("Writing configuration for previously unknown key "+str(key)+".")
-    config[key]=value
+        self.__current_config[key]=value
         if save_to_disk:
             try:
-            config_file = open(file_path, "w")
-            config_file.write(json.dumps(config))
+                config_file = open(self.__file_path, "w")
+                config_file.write(json.dumps(self.__current_config))
                 config_file.close()
             except:
                 util.error("Failed to save config file.")

main.py

@@ -2,7 +2,8 @@
 import os
 import tkinter as tk
 from tkinter import ttk
-import config, gui_helper
+import gui_helper
+from config import Config
 
 ################################################################################
 # CONSTANTS
@@ -17,7 +18,7 @@ configuration_file_path = os.path.join(os.path.expanduser("~"), "some_ide_config
 # PROGRAM STARTUP
 ################################################################################
 
-configuration = config.load_configuration(default_configuration, configuration_file_path)
+configuration = Config(configuration_file_path, default_configuration)
 
 ################################################################################
 # PROGRAM MAIN WINDOW
@@ -25,7 +26,7 @@ configuration = config.load_configuration(default_configuration, configuration_f
 
 main_window = tk.Tk()
 main_window.title("IDE")
-main_window.geometry(config.get_configuration_value(configuration, default_configuration, "window geometry"))
+main_window.geometry(configuration.get_configuration_value("window geometry"))
 
 menubar = None
 def rebuild_menu(structure_dict):
@@ -36,7 +37,7 @@ def rebuild_menu(structure_dict):
 rebuild_menu(gui_helper.menu_structure)
 
 def handle_exit():
-    config.set_configuration_value(configuration_file_path, configuration, "window geometry", main_window.geometry())
+    configuration.set_configuration_value("window geometry", main_window.geometry())
     main_window.destroy()
 
 main_window.protocol("WM_DELETE_WINDOW", handle_exit)