implementing last_modified property

Author: tclose

fileformats/core/collection.py

@@ -31,6 +31,11 @@ def contents(self) -> ty.List[FileSet]:
                     continue
         return contnts
 
+    # @property
+    # def last_modified(self) -> int:
+    #     """The latest modification time of all files in the set"""
+    #     return max(c.last_modified for c in self.contents)
+
     @validated_property
     def _validate_required_content_types(self) -> None:
         not_found = set(self.required_content_types)

fileformats/core/fileset.py

@@ -260,6 +260,11 @@ def mtimes(self) -> ty.Tuple[ty.Tuple[str, int], ...]:
         """
         return tuple((str(p), p.stat().st_mtime_ns) for p in sorted(self.fspaths))
 
+    @property
+    def last_modified(self) -> int:
+        """The latest modification time of all files in the set"""
+        return max(m for _, m in self.mtimes)
+
     @classproperty  # type: ignore[arg-type]
     def mime_type(cls) -> str:
         """Generates a MIME type (IANA) identifier from a format class. If an official