Add count to specify how often a mapping is used

src/toldg/utils.py

@@ -67,19 +67,21 @@ def write_meta(config: Config):
 
 def write_mappings(transactions: List[Transaction], mappings_file: Path):
     """Write transactions to the mappings file."""
-    mappings = {}
-    for t in transactions:
-        mapping = Mapping(
-            **{
-                "account2": t.account2.strip(),
-            }
-        )
-        if t.narration:
-            mapping.narration = t.narration
-        if t.payee:
-            mapping.payee = t.payee
-        mappings[t.row] = mapping.dict()
 
+    mappings = read_mappings(mappings_file)
+    for t in transactions:
+        if t.row in mappings:
+            pass
+        else:
+            mapping = Mapping(
+                **{
+                    "account2": t.account2.strip(),
+                    "narration": t.description,
+                }
+            )
+            mappings[t.row] = mapping
+
+    mappings = {k: v.dict() for k, v in mappings.items()}
     with open(mappings_file, "w") as f:
         json.dump(mappings, f, indent=4)