From 8be5986704e3a80dda706e59fa4288764dbded9d Mon Sep 17 00:00:00 2001
From: Zeno Rogue <zeno@attnam.com>
Date: Sat, 8 Mar 2025 12:32:22 +0100
Subject: [PATCH] rulegen:: canonical_path_to

---
 rulegen.cpp | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/rulegen.cpp b/rulegen.cpp
index a7a16a2c..065b708e 100644
--- a/rulegen.cpp
+++ b/rulegen.cpp
@@ -2408,6 +2408,16 @@ struct hrmap_rulegen : hrmap {
     }
   };
 
+EX vector<int> canonical_path_to(heptagon *h) {
+  vector<int> res;
+  while(h != currentmap->getOrigin()) {
+    res.push_back(h->c.spin(0));
+    h = h->cmove(0);
+    }
+  reverse(res.begin(), res.end());
+  return res;
+  }
+
 EX vector<treestate> alt_treestates;
 
 EX void swap_treestates() {