Bug fix trip stats page

templates/trip/stats.html

@@ -31,20 +31,24 @@
       {% endfor %}
       </div>
     <div>
-      Flight segments in {{ year }}: {{ year_stats.flight_count }}
+      Flight segments in {{ year }}: {{ year_stats.flight_count or 0 }}
+      {% if year_stats.airlines %}
       [ by airline:
-      {% for airline, count in year_stats.airlines.most_common() %}
-        {{ airline }}: {{ count }}{% if not loop.last %},{% endif %}
-      {% endfor %} ]
+        {% for airline, count in year_stats.airlines.most_common() %}
+          {{ airline }}: {{ count }}{% if not loop.last %},{% endif %}
+        {% endfor %} ]
+      {% endif %}
     </div>
-    <div>Trains segments in {{ year }}: {{ year_stats.train_count }}</div>
-    <div>Total distance in {{ year}}: {{ format_distance(year_stats.total_distance) }}</div>
+    <div>Trains segments in {{ year }}: {{ year_stats.train_count or 0 }}</div>
+    <div>Total distance in {{ year}}: {{ format_distance(year_stats.total_distance or 0) }}</div>
+    {% if year_stats.distances_by_transport_type %}
     {% for transport_type, distance in year_stats.distances_by_transport_type.items() %}
       <div>
         {{ transport_type | title }}
         distance: {{format_distance(distance) }}
       </div>
     {% endfor %}
+    {% endif %}
   {% endfor %}
 </div>
 {% endblock %}

validate_yaml.py

@@ -43,14 +43,20 @@ def check_trips() -> None:
 
 
 def check_flights(airlines: set[str]) -> None:
-    """Check flights."""
+    """Check flights and ensure they are in chronological order."""
     bookings = agenda.travel.parse_yaml("flights", data_dir)
+
+    prev_first_depart = None
     for booking in bookings:
         assert all(flight["airline"] in airlines for flight in booking["flights"])
-
-    for booking in bookings:
         check_currency(booking)
 
+        if prev_first_depart:
+            assert (
+                booking["flights"][0]["depart"] > prev_first_depart
+            ), "Bookings are not in chronological order by first flight's departure."
+        prev_first_depart = booking["flights"][0]["depart"]
+
     print(len(bookings), "flights")