Added timewarp --function example

examples/timewarp_filename.py

@@ -0,0 +1,35 @@
+"""Example function for use with `osxphotos timewarp --function`
+
+Call this as: `osxphotos timewarp --function timewarp_filename.py::parse_date_time_from_filename`
+"""
+
+from __future__ import annotations
+
+from datetime import datetime, timedelta
+from typing import Callable
+
+from photoscript import Photo
+from strpdatetime import strpdatetime
+
+
+def parse_date_time_from_filename(
+    photo: Photo, path: str | None, tz_sec: int, tz_name: str, verbose: Callable
+) -> tuple[datetime, int]:
+    """Function for use with `osxphotos timewarp --function` that parses date/time from filename in format "YYYY-MM-DD FILENAME.jpg"
+
+    Args:
+        photo: Photo object
+        path: path to photo, which may be None if photo is not on disk
+        tz_sec: timezone offset from UTC in seconds
+        tz_name: timezone name
+        verbose: function to print verbose messages
+
+    Returns:
+        tuple of (new date/time as datetime.datetime, and new timezone offset from UTC in seconds as int)
+    """
+    filename = photo.filename
+    datetime = strpdatetime(filename, "^%Y-%m-%d")
+
+    verbose(f"Updating {photo.filename} date/time: {datetime}")
+
+    return datetime, tz_sec