make config object oriented

.gitignore

@@ -1 +1,3 @@
 *.swp
+__pycache__
+.spyproject

config.py

@@ -0,0 +1,73 @@
+import os, sys, json
+import tkinter as tk
+from tkinter import ttk
+import gui_helper, util
+
+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(self.__file_path, "r")
+                self.__current_config = json.loads(config_file.read())
+                config_file.close()
+            except:
+                util.error("An exception occurred while trying to load the configuration.", handle_gracefully=False)
+        else:
+            # config not found
+            dialog_interaction_handler = gui_helper.Window_Interaction_Handler()
+
+            dialog = tk.Tk()
+            dialog.title("No configuration found")
+            ttk.Label(dialog, text="No configuration found!").pack()
+            buttons_frame = tk.Frame(dialog)
+            buttons_frame.pack()
+            ttk.Button(buttons_frame, text="Create", command=lambda: dialog_interaction_handler.interact("create", True, additional_action=dialog.destroy)).grid(column=0, row=0)
+            ttk.Button(buttons_frame, text="Quit", command=lambda: dialog_interaction_handler.interact("create", False, additional_action=dialog.destroy)).grid(column=1, row=0)
+            dialog.resizable(0,0)
+            dialog.mainloop()
+
+            if dialog_interaction_handler.get_result("create"):
+                self.__current_config = default_config
+                try:
+                    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 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()
+            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(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:
+                self.__current_config[key] = self.__default_config[key]
+            except KeyError:
+                util.error("Requested an invalid configuration key.")
+                return None
+        return self.__current_config[key]
+
+    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)+".")
+        self.__current_config[key]=value
+        if save_to_disk:
+            try:
+                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.")

gui_helper.py

@@ -0,0 +1,132 @@
+import tkinter as tk
+import util
+
+# easy way to get data out of window events
+class Window_Interaction_Handler:
+    # constructor
+    def __init__(self):
+        self.__window_interactions = {}
+
+    # add a result for an interaction event, saves results in reverse order by default, can optionally call another function
+    def interact(self, name, result, reverse_order=True, additional_action=None, additional_action_parameters=()):
+        if name in self.__window_interactions:
+            if reverse_order:
+                self.__window_interactions[name] = [result] + self.__window_interactions[name]
+            else:
+                self.__window_interactions[name] = self.__window_interactions[name] + [result]
+        else:
+            self.__window_interactions[name] = [result]
+
+        if not additional_action==None:
+            additional_action(*additional_action_parameters)
+
+    # get first result for a given event from the list of results (newest (default) or oldest), removes the returned result from the list by default
+    def get_result(self, name, remove=True):
+        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
+            if remove:
+                result = self.__window_interactions[name].pop(0)
+                if len(self.__window_interactions[name])==0:
+                    del self.__window_interactions[name]
+                return result
+            else:
+                return self.__window_interactions[name][0]
+        else:
+            return None
+
+    # get all results for a given event
+    def get_results(self, name, clear=False):
+        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
+            results = self.__window_interactions[name]
+            if clear:
+                del self.__window_interactions[name]
+            return results
+
+    # clear results for a given event
+    def clear(self, name):
+        if name in self.__window_interactions:
+            del self.__window_interactions[name]
+
+    # destructor
+    def __del__(self):
+        if len(self.__window_interactions)>0:
+            util.warn("__window_interactions not empty upon destruction of Window_Interaction_Handler:\n"+str(self.__window_interactions))
+
+
+def not_implemented():
+    util.warn("Not implemented!")
+
+# format:
+#   "":{} -> menu or submenu
+#   "":function -> menu entry
+#   "":None -> disabled menu entry
+#   None:None -> separator
+#
+# Entries with ... at the end are supposed to open dialogs whereas entries without dots are supposed to take effect immediately
+menu_structure = {
+    "IDE": {
+        "Preferences...": not_implemented,
+        None: None,
+        "Quit": not_implemented
+    },
+    "Project": {
+        "New": {
+            "No known project types": None
+        },
+        "Open...": not_implemented,
+        "Close": {
+            "No open projects": None
+        },
+        None: None,
+        "Preferences...": not_implemented,
+        "Search...": not_implemented,
+        "Build": not_implemented
+    },
+    "File": {
+        "New...": not_implemented,
+        "Open...": not_implemented,
+        "Save": not_implemented,
+        "Close": not_implemented,
+        None: None,
+        "Rename...": not_implemented,
+        "Move...": not_implemented,
+        "View in File Explorer...": not_implemented
+    },
+    "Edit": {
+        "Cut": not_implemented,
+        "Copy": not_implemented,
+        "Paste": not_implemented,
+        "Move code...": not_implemented,
+        None: None,
+        "Search and Replace...": not_implemented,
+        None: None,
+        "Format": not_implemented,
+        "Indent": not_implemented,
+        "Unindent": not_implemented,
+        "Toggle Comment": not_implemented
+    },
+    "View": {
+        "Zoom in": not_implemented,
+        "Zoom out": not_implemented,
+        "Normal Size": not_implemented
+    },
+    "Help": {
+        "Manual...": not_implemented,
+        "About IDE...": not_implemented,
+    }
+}
+
+def build_menu(structure_dict, menu):
+    for entry in structure_dict:
+        if structure_dict[entry]==None:
+            if entry==None:
+                menu.add_separator()
+            else:
+                menu.add_command(label=entry)
+                menu.entryconfig(entry, state="disabled")
+        if isinstance(structure_dict[entry], dict):
+            submenu = tk.Menu(menu, tearoff=False)
+            build_menu(structure_dict[entry], submenu)
+            menu.add_cascade(label=entry, menu=submenu)
+        if callable(structure_dict[entry]):
+            menu.add_command(label=entry, command=structure_dict[entry])
+

main.py

@@ -1,164 +1,24 @@
 #!/usr/bin/python3
+import os
 import tkinter as tk
 from tkinter import ttk
-import sys, os, json, traceback
+import gui_helper
+from config import Config
 
 ################################################################################
-# DEFINITIONS
+# CONSTANTS
 ################################################################################
 
-EXIT_SUCCESS=0
-EXIT_ERROR=1
-
 default_configuration = {
     "window geometry": "640x480"
 }
-# empty configuration by default because new values will be added while trying to load them
-# this allows the IDE to load old configuration files with missing keys
-configuration = {}
-home_directory = os.path.expanduser("~")
-config_file_path = os.path.join(home_directory, "some_ide_config.json")
-
-def info(message):
-    # print info to sys.stderr because it isn’t really output, just debug information
-    print("INFO: "+str(message), file=sys.stderr)
-    traceback.print_stack()
-
-def warn(message, is_exception=False):
-    print("WARNING: "+str(message), file=sys.stderr)
-    if is_exception:
-        traceback.print_exc()
-    else:
-        traceback.print_stack()
-
-def error(message, is_exception=True, handle_gracefully=True):
-    print("ERROR: "+str(message), file=sys.stderr)
-    if is_exception:
-        traceback.print_exc()
-    else:
-        traceback.print_stack()
-    if handle_gracefully:
-        pass
-    else:
-        sys.exit(EXIT_ERROR)
-
-def get_configuration_value(key):
-    if key in configuration:
-        pass
-    else:
-        info("Requested configuration value for "+str(key)+" not in configuration. Loading from default configuration.")
-        try:
-            configuration[key] = default_configuration[key]
-        except KeyError:
-            error("Requested an invalid configuration key.")
-            return None
-    return configuration[key]
-
-def set_configuration_value(key, value, save_to_disk=True):
-    if not key in configuration:
-        info("Writing configuration for previously unknown key "+str(key)+".")
-    configuration[key]=value
-    try:
-        config_file = open(config_file_path, "w")
-        config_file.write(json.dumps(configuration))
-        config_file.close()
-    except:
-        error("Failed to save config file.")
-
-# easy way to get data out of window events
-class Window_Interaction_Handler:
-    # constructor
-    def __init__(self):
-        self.__window_interactions = {}
-
-    # add a result for an interaction event, saves results in reverse order by default, can optionally call another function
-    def interact(self, name, result, reverse_order=True, additional_action=None, additional_action_parameters=()):
-        if name in self.__window_interactions:
-            if reverse_order:
-                self.__window_interactions[name] = [result] + self.__window_interactions[name]
-            else:
-                self.__window_interactions[name] = self.__window_interactions[name] + [result]
-        else:
-            self.__window_interactions[name] = [result]
-
-        if not additional_action==None:
-            additional_action(*additional_action_parameters)
-
-    # get first result for a given event from the list of results (newest (default) or oldest), removes the returned result from the list by default
-    def get_result(self, name, remove=True):
-        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
-            if remove:
-                result = self.__window_interactions[name].pop(0)
-                if len(self.__window_interactions[name])==0:
-                    del self.__window_interactions[name]
-                return result
-            else:
-                return self.__window_interactions[name][0]
-        else:
-            return None
-
-    # get all results for a given event
-    def get_results(self, name, clear=False):
-        if name in self.__window_interactions and len(self.__window_interactions[name])>0:
-            results = self.__window_interactions[name]
-            if clear:
-                del self.__window_interactions[name]
-            return results
-
-    # clear results for a given event
-    def clear(self, name):
-        if name in self.__window_interactions:
-            del self.__window_interactions[name]
-
-    # destructor
-    def __del__(self):
-        if len(self.__window_interactions)>0:
-            warn("__window_interactions not empty upon destruction of Window_Interaction_Handler:\n"+str(self.__window_interactions))
+configuration_file_path = os.path.join(os.path.expanduser("~"), "some_ide_config.json")
 
 ################################################################################
 # PROGRAM STARTUP
 ################################################################################
 
-# read configuration
-if os.path.isfile(config_file_path):
-    try:
-        config_file = open(config_file_path, "r")
-        configuration = json.loads(config_file.read())
-        config_file.close()
-    except Exception:
-        error("An exception occurred while trying to load the configuration.", handle_gracefully=False)
-else:
-    # config not found
-    dialog_interaction_handler = Window_Interaction_Handler()
-
-    dialog = tk.Tk()
-    dialog.title("No configuration found")
-    ttk.Label(dialog, text="No configuration found!").pack()
-    buttons_frame = tk.Frame(dialog)
-    buttons_frame.pack()
-    ttk.Button(buttons_frame, text="Create", command=lambda: dialog_interaction_handler.interact("create", True, additional_action=dialog.destroy)).grid(column=0, row=0)
-    ttk.Button(buttons_frame, text="Quit", command=lambda: dialog_interaction_handler.interact("create", False, additional_action=dialog.destroy)).grid(column=1, row=0)
-    dialog.resizable(0,0)
-    dialog.mainloop()
-
-    if dialog_interaction_handler.get_result("create"):
-        try:
-            config_file = open(config_file_path, "w")
-            config_file.write(json.dumps(default_configuration))
-            config_file.close()
-        except:
-            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()
-            ttk.Button(dialog, text="Continue", command=dialog.destroy).pack()
-            dialog.resizable(0,0)
-            dialog.mainloop()
-    else:
-        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(EXIT_SUCCESS)
+configuration = Config(configuration_file_path, default_configuration)
 
 ################################################################################
 # PROGRAM MAIN WINDOW
@@ -166,94 +26,18 @@ else:
 
 main_window = tk.Tk()
 main_window.title("IDE")
-main_window.geometry(get_configuration_value("window geometry"))
-
-def not_implemented():
-    warn("Not implemented!")
-
-# format:
-#   "":{} -> menu or submenu
-#   "":function -> menu entry
-#   "":None -> disabled menu entry
-#   None:None -> separator
-#
-# Entries with ... at the end are supposed to open dialogs whereas entries without dots are supposed to take effect immediately
-menu_structure = {
-    "IDE": {
-        "Preferences...": not_implemented,
-        "Quit": not_implemented
-    },
-    "Project": {
-        "New": {
-            "No known project types": None
-        },
-        "Open...": not_implemented,
-        "Close": {
-            "No open projects": None
-        },
-        None: None,
-        "Preferences...": not_implemented,
-        "Search...": not_implemented,
-        "Build": not_implemented
-    },
-    "File": {
-        "New...": not_implemented,
-        "Open...": not_implemented,
-        "Save": not_implemented,
-        "Close": not_implemented,
-        None: None,
-        "Rename...": not_implemented,
-        "Move...": not_implemented,
-        "View in File Explorer...": not_implemented
-    },
-    "Edit": {
-        "Cut": not_implemented,
-        "Copy": not_implemented,
-        "Paste": not_implemented,
-        None: None,
-        "Search and Replace...": not_implemented,
-        None: None,
-        "Format": not_implemented,
-        "Indent": not_implemented,
-        "Unindent": not_implemented,
-        "Toggle Comment": not_implemented
-    },
-    "View": {
-        "Zoom in": not_implemented,
-        "Zoom out": not_implemented,
-        "Normal Size": not_implemented
-    },
-    "Help": {
-        "Manual...": not_implemented,
-        "About IDE...": not_implemented,
-    }
-}
+main_window.geometry(configuration.get_configuration_value("window geometry"))
 
 menubar = None
-def build_menu(structure_dict, menu):
-    for entry in structure_dict:
-        if structure_dict[entry]==None:
-            if entry==None:
-                menu.add_separator()
-            else:
-                menu.add_command(label=entry)
-                menu.entryconfig(entry, state="disabled")
-        if isinstance(structure_dict[entry], dict):
-            submenu = tk.Menu(menu, tearoff=False)
-            build_menu(structure_dict[entry], submenu)
-            menu.add_cascade(label=entry, menu=submenu)
-        if callable(structure_dict[entry]):
-            menu.add_command(label=entry, command=structure_dict[entry])
-
-def rebuild_menu():
+def rebuild_menu(structure_dict):
     menubar = tk.Menu(main_window)
-    build_menu(menu_structure, menubar)
+    gui_helper.build_menu(structure_dict, menubar)
     main_window.config(menu=menubar)
 
-rebuild_menu()
+rebuild_menu(gui_helper.menu_structure)
 
 def handle_exit():
-    set_configuration_value("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)

util.py

@@ -0,0 +1,27 @@
+import sys, traceback
+
+EXIT_SUCCESS=0
+EXIT_ERROR=1
+
+def info(message):
+    # print info to sys.stderr because it isn’t really output, just debug information
+    print("INFO: "+str(message), file=sys.stderr)
+    traceback.print_stack()
+
+def warn(message, is_exception=False):
+    print("WARNING: "+str(message), file=sys.stderr)
+    if is_exception:
+        traceback.print_exc()
+    else:
+        traceback.print_stack()
+
+def error(message, is_exception=True, handle_gracefully=True):
+    print("ERROR: "+str(message), file=sys.stderr)
+    if is_exception:
+        traceback.print_exc()
+    else:
+        traceback.print_stack()
+    if handle_gracefully:
+        pass
+    else:
+        sys.exit(EXIT_ERROR)