Improved log formatting support by @kanta.logfmt, which replaces old resolver and user_display arguments (breaking change).

tests/test_format_diff.py

@@ -16,10 +16,34 @@ def test_delete():
     assert any("old_key" in line for line in lines)
 
 
-def test_resolver():
+def test_logfmt():
     lines = format_diff(
         {"users": {"uuid-1": {"name": "Alice"}}},
         previous={},
-        resolver=lambda x: "Alice" if x == "uuid-1" else x,
+        logfmt=lambda value, path: "Alice" if value == "uuid-1" else None,
     )
     assert any("Alice" in line for line in lines)
+
+
+def test_logfmt_uses_path_context():
+    lines = format_diff(
+        {
+            "users": {"uuid-1": {"name": "Alice"}},
+            "groups": {"uuid-1": {"name": "Admins"}},
+        },
+        previous={},
+        logfmt=lambda value, path: (
+            "User Alice" if path.startswith("users.") and value == "uuid-1" else None
+        ),
+    )
+    assert any("User Alice" in line for line in lines)
+    assert any("uuid-1" in line for line in lines)
+
+
+def test_logfmt_formats_non_string_value():
+    lines = format_diff(
+        {"count": 42},
+        previous={},
+        logfmt=lambda value, path: "forty-two" if value == 42 else None,
+    )
+    assert any("forty-two" in line for line in lines)