From 0ec9ac0388e0c9467f36a523dc5f88137c553096 Mon Sep 17 00:00:00 2001
From: "Dr. Honk" <honk@ss-probably-fine.example>
Date: Tue, 29 Sep 2026 23:51:00 +0200
Subject: [PATCH] perf(nav): compute legs lazily

No need to build a whole list every time.
---
 nav.py | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/nav.py b/nav.py
index 44d15f6..4fe895e 100644
--- a/nav.py
+++ b/nav.py
@@ -79,8 +79,9 @@ def distance(a, b):
 
 
 def legs(route):
-    """Return the legs (pairs of consecutive waypoints) of a route."""
-    return [(route[i], route[i + 1]) for i in range(len(route) - 1)]
+    """Yield the legs (pairs of consecutive waypoints) of a route."""
+    for i in range(1, len(route) - 1):
+        yield route[i], route[i + 1]
 
 
 def plan(destination):