Refactor and add some docstrings.

agenda/stats.py

@@ -0,0 +1,45 @@
+"""Trip statistic functions."""
+
+from collections import defaultdict
+
+from agenda.types import StrDict, Trip
+
+
+def calculate_yearly_stats(trips: list[Trip]) -> dict[int, StrDict]:
+    """Calculate total distance and distance by transport type grouped by year."""
+    yearly_stats: defaultdict[int, StrDict] = defaultdict(dict)
+    for trip in trips:
+        year = trip.start.year
+        dist = trip.total_distance()
+        yearly_stats[year].setdefault("count", 0)
+        yearly_stats[year]["count"] += 1
+
+        for c in trip.conferences:
+            yearly_stats[c["start"].year].setdefault("conferences", 0)
+            yearly_stats[c["start"].year]["conferences"] += 1
+
+        if dist:
+            yearly_stats[year]["total_distance"] = (
+                yearly_stats[year].get("total_distance", 0) + trip.total_distance()
+            )
+
+        for transport_type, distance in trip.distances_by_transport_type():
+            yearly_stats[year].setdefault("distances_by_transport_type", {})
+            yearly_stats[year]["distances_by_transport_type"][transport_type] = (
+                yearly_stats[year]["distances_by_transport_type"].get(transport_type, 0)
+                + distance
+            )
+
+        for country in trip.countries:
+            if country.alpha_2 == "GB":
+                continue
+            yearly_stats[year].setdefault("countries", set())
+            yearly_stats[year]["countries"].add(country)
+        for leg in trip.travel:
+            if leg["type"] == "flight":
+                yearly_stats[year].setdefault("flight_count", 0)
+                yearly_stats[year]["flight_count"] += 1
+            if leg["type"] == "train":
+                yearly_stats[year].setdefault("train_count", 0)
+                yearly_stats[year]["train_count"] += 1
+    return dict(yearly_stats)

agenda/trip.py

@@ -3,7 +3,6 @@
 import decimal
 import os
 import typing
-from collections import defaultdict
 from datetime import date, datetime, time
 from zoneinfo import ZoneInfo
 
@@ -88,6 +87,11 @@ def load_ferries(
 
 
 def depart_datetime(item: StrDict) -> datetime:
+    """Return a datetime for this travel item.
+
+    If the travel item already has a datetime return that, otherwise if the
+    departure time is just a date return midnight UTC for that date.
+    """
     depart = item["depart"]
     if isinstance(depart, datetime):
         return depart
@@ -132,42 +136,29 @@ def load_flights(flight_bookings: list[StrDict]) -> list[StrDict]:
     return flights
 
 
-def build_trip_list(
+def collect_travel_items(
+    flight_bookings: list[StrDict],
     data_dir: str | None = None,
     route_distances: travel.RouteDistances | None = None,
-) -> list[Trip]:
+) -> list[StrDict]:
     """Generate list of trips."""
-    trips: dict[date, Trip] = {}
-
     if data_dir is None:
         data_dir = flask.current_app.config["PERSONAL_DATA"]
 
-    yaml_trip_list = travel.parse_yaml("trips", data_dir)
+    return sorted(
-
+        load_flights(load_flight_bookings(data_dir))
-    yaml_trip_lookup = {item["trip"]: item for item in yaml_trip_list}
-
-    flight_bookings = load_flight_bookings(data_dir)
-
-    travel_items = sorted(
-        load_flights(flight_bookings)
         + load_trains(data_dir, route_distances=route_distances)
         + load_ferries(data_dir, route_distances=route_distances),
         key=depart_datetime,
     )
 
-    data = {
-        "flight_bookings": flight_bookings,
-        "travel": travel_items,
-        "accommodation": travel.parse_yaml("accommodation", data_dir),
-        "conferences": travel.parse_yaml("conferences", data_dir),
-        "events": travel.parse_yaml("events", data_dir),
-    }
-
-    for item in data["accommodation"]:
-        price = item.get("price")
-        if price:
-            item["price"] = decimal.Decimal(price)
 
+def group_travel_items_into_trips(
+    data: StrDict, yaml_trip_list: list[StrDict]
+) -> list[Trip]:
+    """Group travel items into trips."""
+    trips: dict[date, Trip] = {}
+    yaml_trip_lookup = {item["trip"]: item for item in yaml_trip_list}
     for key, item_list in data.items():
         assert isinstance(item_list, list)
         for item in item_list:
@@ -183,6 +174,34 @@ def build_trip_list(
     return [trip for _, trip in sorted(trips.items())]
 
 
+def build_trip_list(
+    data_dir: str | None = None,
+    route_distances: travel.RouteDistances | None = None,
+) -> list[Trip]:
+    """Generate list of trips."""
+    if data_dir is None:
+        data_dir = flask.current_app.config["PERSONAL_DATA"]
+
+    yaml_trip_list = travel.parse_yaml("trips", data_dir)
+
+    flight_bookings = load_flight_bookings(data_dir)
+
+    data = {
+        "flight_bookings": flight_bookings,
+        "travel": collect_travel_items(flight_bookings, data_dir, route_distances),
+        "accommodation": travel.parse_yaml("accommodation", data_dir),
+        "conferences": travel.parse_yaml("conferences", data_dir),
+        "events": travel.parse_yaml("events", data_dir),
+    }
+
+    for item in data["accommodation"]:
+        price = item.get("price")
+        if price:
+            item["price"] = decimal.Decimal(price)
+
+    return group_travel_items_into_trips(data, yaml_trip_list)
+
+
 def add_coordinates_for_unbooked_flights(
     routes: list[StrDict], coordinates: list[StrDict]
 ) -> None:
@@ -207,7 +226,7 @@ def add_coordinates_for_unbooked_flights(
 
 
 def collect_trip_coordinates(trip: Trip) -> list[StrDict]:
-    """Extract and deduplicate airport and station coordinates from trip."""
+    """Extract and de-duplicate airport and station coordinates from trip."""
     stations = {}
     station_list = []
     airports = {}
@@ -364,6 +383,7 @@ def get_trip_routes(trip: Trip) -> list[StrDict]:
 def get_coordinates_and_routes(
     trip_list: list[Trip], data_dir: str | None = None
 ) -> tuple[list[StrDict], list[StrDict]]:
+    """Given a list of trips return the associated coordinates and routes."""
     if data_dir is None:
         data_dir = flask.current_app.config["PERSONAL_DATA"]
     coordinates = []
@@ -389,43 +409,3 @@ def get_coordinates_and_routes(
             route["geojson"] = read_geojson(data_dir, route.pop("geojson_filename"))
 
     return (coordinates, routes)
-
-
-def calculate_yearly_stats(trips: list[Trip]) -> dict[int, StrDict]:
-    """Calculate total distance and distance by transport type grouped by year."""
-    yearly_stats: defaultdict[int, StrDict] = defaultdict(dict)
-    for trip in trips:
-        year = trip.start.year
-        dist = trip.total_distance()
-        yearly_stats[year].setdefault("count", 0)
-        yearly_stats[year]["count"] += 1
-
-        for c in trip.conferences:
-            yearly_stats[c["start"].year].setdefault("conferences", 0)
-            yearly_stats[c["start"].year]["conferences"] += 1
-
-        if dist:
-            yearly_stats[year]["total_distance"] = (
-                yearly_stats[year].get("total_distance", 0) + trip.total_distance()
-            )
-
-        for transport_type, distance in trip.distances_by_transport_type():
-            yearly_stats[year].setdefault("distances_by_transport_type", {})
-            yearly_stats[year]["distances_by_transport_type"][transport_type] = (
-                yearly_stats[year]["distances_by_transport_type"].get(transport_type, 0)
-                + distance
-            )
-
-        for country in trip.countries:
-            if country.alpha_2 == "GB":
-                continue
-            yearly_stats[year].setdefault("countries", set())
-            yearly_stats[year]["countries"].add(country)
-        for leg in trip.travel:
-            if leg["type"] == "flight":
-                yearly_stats[year].setdefault("flight_count", 0)
-                yearly_stats[year]["flight_count"] += 1
-            if leg["type"] == "train":
-                yearly_stats[year].setdefault("train_count", 0)
-                yearly_stats[year]["train_count"] += 1
-    return dict(yearly_stats)