README.md

@@ -1,23 +1,10 @@
 # Navigation computer of the SS Probably Fine
 
 Computes flight plans for the *SS Probably Fine*: route, distance,
-travel time, and the amount of fuel required.
+travel time, and the amout of fuel required.
 
 ```console
 $ python3 nav.py mars
 ```
 
 Requires Python 3.9 or newer; no further dependencies.
-
-All routes start at Earth. Getting back is your own problem.
-
-## Contributing
-
-Use Conventional Commits. Do not push broken code.
-(Yes, Dr. Honk, this means you.)
-
-## Maintenance
-
-All maintenance is recorded in `maintenance.md`.
-
-To list all known destinations, run `python3 nav.py --list`.

crew.md

@@ -3,10 +3,5 @@
 | Name | Role |
 |------|------|
 | Captain Vega | Captain |
-| Dr. Honk | Chief medical officer |
+| Dr. Honk | Ship's doctor |
 | Lt. Byte | Chief engineer |
-| Cmdr. Nova | Pilot |
-| Ensign Pixel | Navigator |
-| Quackers, the debugging duck | Morale officer |
-| `coffeed` | Beverage officer |
-| Mission control | Remote support (does not accept pushes) |

maintenance.md

@@ -1,64 +1,3 @@
 # Maintenance log
 
 Newest entries at the bottom.
-- 2026-09-01: Escape pod batteries charged.
-- 2026-09-02: Antenna realigned.
-- 2026-09-02: Fire extinguishers checked.
-- 2026-09-04: Gyroscopes recalibrated.
-- 2026-09-04: Escape pod batteries charged.
-- 2026-09-04: Oxygen scrubbers replaced.
-- 2026-09-05: Water recycling filters replaced.
-- 2026-09-05: Antenna realigned.
-- 2026-09-06: Fuel lines checked for leaks.
-- 2026-09-07: Solar panels cleaned.
-- 2026-09-07: Coffee machine descaled.
-- 2026-09-07: Hull inspection, no leaks.
-- 2026-09-09: Antenna realigned.
-- 2026-09-09: Solar panels cleaned.
-- 2026-09-10: Escape pod batteries charged.
-- 2026-09-10: Debugging duck accounted for.
-- 2026-09-11: Comms backup tested.
-- 2026-09-14: Water recycling filters replaced.
-- 2026-09-15: Airlock seals checked.
-- 2026-09-15: Water recycling filters replaced.
-- 2026-09-16: Coffee machine descaled.
-- 2026-09-16: Antenna realigned.
-- 2026-09-17: Cabin pressure sensors tested.
-- 2026-09-18: Radiation shielding inspected.
-- 2026-09-18: Debugging duck accounted for.
-- 2026-09-18: Fire extinguishers checked.
-- 2026-09-20: Fire extinguishers checked.
-- 2026-09-20: Oxygen scrubbers replaced.
-- 2026-09-21: Solar panels cleaned.
-- 2026-09-21: Gyroscopes recalibrated.
-- 2026-09-22: Fuel lines checked for leaks.
-- 2026-09-23: Escape pod batteries charged.
-- 2026-09-24: Galley fridge defrosted.
-- 2026-09-27: Escape pod batteries charged.
-- 2026-09-27: Comms backup tested.
-- 2026-09-28: Gyroscopes recalibrated.
-- 2026-09-28: Hull inspection, no leaks.
-- 2026-09-30: Navigation lights checked.
-- 2026-10-01: Cabin pressure sensors tested.
-- 2026-10-02: Escape pod batteries charged.
-- 2026-10-03: Navigation lights checked.
-- 2026-10-05: Fuel lines checked for leaks.
-- 2026-10-05: Fire extinguishers checked.
-- 2026-10-05: Hull inspection, no leaks.
-- 2026-10-06: Water recycling filters replaced.
-- 2026-10-06: Debugging duck accounted for.
-- 2026-10-07: Oxygen scrubbers replaced.
-- 2026-10-07: Coffee machine descaled.
-- 2026-10-08: Cabin pressure sensors tested.
-- 2026-10-08: Thrusters test-fired.
-- 2026-10-09: Galley fridge defrosted.
-- 2026-10-10: Airlock seals checked.
-- 2026-10-10: Galley fridge defrosted.
-- 2026-10-11: Thrusters test-fired.
-- 2026-10-11: Cabin pressure sensors tested.
-- 2026-10-11: Antenna realigned.
-- 2026-10-12: Thrusters test-fired.
-- 2026-10-13: Fuel lines checked for leaks.
-- 2026-10-14: Fuel lines checked for leaks.
-- 2026-10-14: Hull inspection, no leaks.
-- 2026-10-15: Escape pod batteries charged.

nav.py

@@ -2,52 +2,21 @@
 """Navigation computer of the SS Probably Fine.
 
 Usage: python3 nav.py DESTINATION
-       python3 nav.py --list
-       python3 nav.py --all
 """
 
 import sys
-from collections.abc import Iterator
 
 # Distances between neighboring waypoints, in million km.
 DISTANCES = {
     ("earth", "moon"): 0.4,
     ("earth", "gateway"): 0.4,
     ("gateway", "mars"): 225.0,
-    ("gateway", "venus"): 41.0,
-    ("mars", "phobos"): 0.01,
-    ("mars", "deimos"): 0.02,
-    ("venus", "mercury"): 48.0,
-    ("mars", "ceres"): 265.0,
-    ("gateway", "milliways"): 42.0,
-    ("ceres", "vesta"): 96.0,
-    ("ceres", "europa"): 399.0,
-    ("europa", "io"): 0.25,
-    ("europa", "ganymede"): 0.4,
-    ("ganymede", "callisto"): 0.8,
-    ("europa", "titan"): 655.0,
-    ("titan", "enceladus"): 1.0,
-    ("titan", "pluto"): 4387.0,
 }
 
 # Every route starts at Earth.
 ROUTES = {
     "moon": ["earth", "moon"],
     "mars": ["earth", "gateway", "mars"],
-    "venus": ["earth", "gateway", "venus"],
-    "phobos": ["earth", "gateway", "mars", "phobos"],
-    "deimos": ["earth", "gateway", "mars", "deimos"],
-    "mercury": ["earth", "gateway", "venus", "mercury"],
-    "ceres": ["earth", "gateway", "mars", "ceres"],
-    "milliways": ["earth", "gateway", "milliways"],
-    "vesta": ["earth", "gateway", "mars", "ceres", "vesta"],
-    "europa": ["earth", "gateway", "mars", "ceres", "europa"],
-    "io": ["earth", "gateway", "mars", "ceres", "europa", "io"],
-    "ganymede": ["earth", "gateway", "mars", "ceres", "europa", "ganymede"],
-    "callisto": ["earth", "gateway", "mars", "ceres", "europa", "ganymede", "callisto"],
-    "titan": ["earth", "gateway", "mars", "ceres", "europa", "titan"],
-    "enceladus": ["earth", "gateway", "mars", "ceres", "europa", "titan", "enceladus"],
-    "pluto": ["earth", "gateway", "mars", "ceres", "europa", "titan", "pluto"],
 }
 
 NAMES = {
@@ -55,20 +24,6 @@ NAMES = {
     "moon": "Moon",
     "gateway": "Lunar Gateway",
     "mars": "Mars",
-    "venus": "Venus",
-    "phobos": "Phobos",
-    "deimos": "Deimos",
-    "mercury": "Mercury",
-    "ceres": "Ceres",
-    "milliways": "Restaurant at the End of the Universe",
-    "vesta": "Vesta",
-    "europa": "Europa",
-    "io": "Io",
-    "ganymede": "Ganymede",
-    "callisto": "Callisto",
-    "titan": "Titan",
-    "enceladus": "Enceladus",
-    "pluto": "Pluto",
 }
 
 CRUISE_SPEED = 0.87  # million km per day
@@ -76,21 +31,17 @@ FUEL_PER_MKM = 0.142  # tonnes of fuel per million km
 LAUNCH_FUEL = 380.0  # tonnes of fuel to escape Earth's gravity
 
 
-def distance(a: str, b: str) -> float:
+def distance(a, b):
-    """Return the distance between two neighboring waypoints."""
     if (a, b) in DISTANCES:
         return DISTANCES[(a, b)]
     return DISTANCES[(b, a)]
 
 
-def legs(route: list[str]) -> Iterator[tuple[str, str]]:
+def legs(route):
-    """Yield the legs (pairs of consecutive waypoints) of a route."""
+    return [(route[i], route[i + 1]) for i in range(len(route) - 1)]
-    for i in range(1, len(route) - 1):
-        yield route[i], route[i + 1]
 
 
-def plot_course(destination: str) -> tuple[list[str], float, float, float]:
+def plan(destination):
-    """Return route, distance, travel time (days) and fuel (t)."""
     route = ROUTES[destination]
     total = 0.0
     fuel = 0.0
@@ -103,38 +54,14 @@ def plot_course(destination: str) -> tuple[list[str], float, float, float]:
     return route, total, total / CRUISE_SPEED, fuel
 
 
-def asteroid_route(belt: str) -> list[str]:
+def main():
-    """Return a route through the asteroid belt (currently: via Ceres)."""
+    destination = sys.argv[1]
-    return ROUTES["ceres"] + [belt]
+    route, total, days, fuel = plan(destination)
-
-
-def print_plan(destination: str) -> None:
-    """Print the flight plan for a destination."""
-    route, total, days, fuel = plot_course(destination)
     print("Route: " + " -> ".join(NAMES[w] for w in route))
     print(f"Distance: {total:.1f} million km")
     print(f"Travel time: {round(days)} days")
     print(f"Fuel required: {round(fuel)} t")
 
 
-def main() -> None:
-    if len(sys.argv) != 2:
-        sys.exit(__doc__)
-    if sys.argv[1] == "--list":
-        for key in sorted(ROUTES):
-            print(f"{key:12} {NAMES[key]}")
-        return
-    if sys.argv[1] == "--all":
-        for key in sorted(ROUTES):
-            print_plan(key)
-            print()
-        return
-    destination = sys.argv[1].lower()
-    if destination not in ROUTES:
-        known = ", ".join(sorted(ROUTES))
-        sys.exit(f"Unknown destination: {destination} (known: {known})")
-    print_plan(destination)
-
-
 if __name__ == "__main__":
     main()