Added Singleton class to inherit as needed

src/utils/endpoint_registry.py

@@ -3,11 +3,11 @@
 # Lib imports
 
 # Application imports
+from .singleton import Singleton
 
 
 
-
+class EndpointRegistry(Singleton):
-class EndpointRegistry():
     def __init__(self):
         self._endpoints = {}
 

src/utils/event_system.py

@@ -4,11 +4,11 @@ from collections import defaultdict
 # Lib imports
 
 # Application imports
+from .singleton import Singleton
 
 
 
-
+class EventSystem(Singleton):
-class EventSystem:
     """ Create event system. """
 
     def __init__(self):

src/utils/keybindings.py

@@ -7,7 +7,7 @@ gi.require_version('Gdk', '3.0')
 from gi.repository import Gdk
 
 # Application imports
-
+from .singleton import Singleton
 
 
 
@@ -19,7 +19,7 @@ class KeymapError(Exception):
     """ Custom exception for errors in keybinding configurations """
 
 MODIFIER = re.compile('<([^<]+)>')
-class Keybindings:
+class Keybindings(Singleton):
     """ Class to handle loading and lookup of Terminator keybindings """
 
     modifiers = {

src/utils/logger.py

@@ -5,11 +5,11 @@ import logging
 # Lib imports
 
 # Application imports
+from .singleton import Singleton
 
 
 
-
+class Logger(Singleton):
-class Logger:
     """
         Create a new logging object and return it.
         :note:

src/utils/settings/settings.py

@@ -6,6 +6,7 @@ import inspect
 # Lib imports
 
 # Application imports
+from ..singleton import Singleton
 from .start_check_mixin import StartCheckMixin
 
 
@@ -14,7 +15,7 @@ class MissingConfigError(Exception):
 
 
 
-class Settings(StartCheckMixin):
+class Settings(StartCheckMixin, Singleton):
     def __init__(self):
         self._SCRIPT_PTH        = os.path.dirname(os.path.realpath(__file__))
         self._USER_HOME         = os.path.expanduser('~')

src/utils/singleton.py

@@ -0,0 +1,23 @@
+# Python imports
+
+# Lib imports
+
+# Application imports
+
+
+class SingletonError(Exception):
+    pass
+
+
+
+class Singleton:
+    ccount = 0
+
+    def __new__(cls, *args, **kwargs):
+        obj        = super(Singleton, cls).__new__(cls)
+        cls.ccount += 1
+
+        if cls.ccount == 2:
+            raise SingletonError(f"Exceeded {cls.__name__} instantiation limit...")
+
+        return obj