Use most recent CSV list of flights.

show

@@ -1,10 +1,11 @@
 #!/usr/bin/python3
 
 import csv
+import os
 from datetime import datetime, timedelta
+from typing import Callable
 
-# from pprint import pprint
+backup_loc = os.path.expanduser("~/backup/openflights")
-
 now = datetime.now()
 since_date = now - timedelta(days=365 * 5)
 
@@ -21,6 +22,12 @@ Flight = dict[str, str]
 Flights = list[tuple[datetime, Flight]]
 
 
+def get_most_recent(loc: str, pred: Callable[[str], bool] | None = None) -> str | None:
+    """Get the most recent file in a directory."""
+    files = [f for f in os.listdir(loc) if pred is None or pred(f)]
+    return os.path.join(loc, max(files)) if files else None
+
+
 def format_row(dt: datetime, f: Flight) -> str:
     """Format flight."""
     d = dt.strftime("%a, %d %b %Y")
@@ -82,6 +89,7 @@ def show_flights(flights: Flights) -> None:
 
 
 if __name__ == "__main__":
-    filename = "/home/edward/backup/openflights/openflights-backup-2023-09-09.csv"
+    filename = get_most_recent(backup_loc, lambda f: f.endswith(".csv"))
+    assert filename
     flights = read_flights(filename)
     show_flights(flights)