From 11fd1b7083136aabbe1ca393616c5d5128bd19a5 Mon Sep 17 00:00:00 2001
From: Ching Pei Yang <badnam3o.0@gmail.com>
Date: Fri, 26 Sep 2025 00:28:21 +0200
Subject: [PATCH] lib/dag: improve dependency cycle error message

---
 lib/dag.nix | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/lib/dag.nix b/lib/dag.nix
index cbf52083..db5d53b7 100644
--- a/lib/dag.nix
+++ b/lib/dag.nix
@@ -8,7 +8,7 @@
 #  - the addition of the function `entryBefore` indicating a "wanted
 #    by" relationship.
 {lib}: let
-  inherit (builtins) isAttrs attrValues attrNames elem all head tail length toJSON isString;
+  inherit (builtins) isAttrs attrValues attrNames elem all head tail length toJSON isString removeAttrs;
   inherit (lib.attrsets) filterAttrs mapAttrs;
   inherit (lib.lists) toposort;
   inherit (lib.nvim.dag) empty isEntry entryBetween entryAfter entriesBetween entryAnywhere topoSort;
@@ -169,10 +169,11 @@ in {
       else value)
     dag;
     sortedDag = topoSort finalDag;
+    loopDetail = map (loops: removeAttrs loops ["data"]) sortedDag.loops;
     result =
       if sortedDag ? result
       then mapResult sortedDag.result
-      else abort ("Dependency cycle in ${name}: " + toJSON sortedDag);
+      else abort ("Dependency cycle in ${name}: " + toJSON loopDetail);
   in
     result;
 }