make config class a better interface

PyTeX/format/formatterif.py

@@ -3,7 +3,20 @@ from pathlib import Path
 
 
 class Config:
-    pass
+    def merge_with(self, other, strict: bool = False):
+        """
+        Merges the other config into this one
+        :param other:
+        :param strict: whether conflicting options are allowed or not
+        :return: self
+        """
+        for var in vars(self):
+            if not getattr(self, var):
+                setattr(self, var, getattr(other, var))
+            else:
+                if strict and getattr(other, var) is not None and getattr(self, var) != getattr(other, var):
+                    raise NotImplementedError
+        return self
 
 
 class FormatterIF:

PyTeX/format/formatting_config.py

@@ -53,20 +53,6 @@ class FormattingConfig(Config):
     def from_yaml(cls, yaml):
         pass
 
-    def merge_with(self, other, strict: bool = False):
-        """
-        Merges the other config into this one
-        :param other:
-        :param strict: whether conflicting options are allowed or not
-        :return: self
-        """
-        for var in vars(self):
-            if not getattr(self, var):
-                setattr(self, var, getattr(other, var))
-            else:
-                if strict and getattr(other, var) is not None and getattr(self, var) != getattr(other, var):
-                    raise NotImplementedError
-        return self
 
     @property
     def naming_scheme(self) -> NamingScheme: