From 440110b83ffe8391e726dfa8efa83c229372a779 Mon Sep 17 00:00:00 2001
From: Cole Helbling <cole.e.helbling@outlook.com>
Date: Sat, 2 May 2020 16:36:49 -0700
Subject: [PATCH] nixpkgs-fmt: fix erroneous debug output (#86335)

Prior to this, when used in conjunction with e.g. `format-all-mode`,
garbage like

    node: NODE_STRING@[8934; 9139), indent: IndentLevel { level: 3, alignment: 0 }

would be written to the file.
---
 pkgs/tools/nix/nixpkgs-fmt/default.nix | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/pkgs/tools/nix/nixpkgs-fmt/default.nix b/pkgs/tools/nix/nixpkgs-fmt/default.nix
index b95bb46a844..b55ac647b35 100644
--- a/pkgs/tools/nix/nixpkgs-fmt/default.nix
+++ b/pkgs/tools/nix/nixpkgs-fmt/default.nix
@@ -1,4 +1,4 @@
-{ lib, rustPlatform, fetchFromGitHub }:
+{ lib, rustPlatform, fetchFromGitHub, fetchpatch }:
 rustPlatform.buildRustPackage rec {
   pname = "nixpkgs-fmt";
   version = "0.8.0";
@@ -10,6 +10,15 @@ rustPlatform.buildRustPackage rec {
     sha256 = "09lhi8aidw9qf94n07mgs2nfac32a96wkx50glj35dhn06iwzwqr";
   };
 
+  patches = [
+    # Fixes debug output on stdout mangling some files. Fixed in next release.
+    # https://github.com/nix-community/nixpkgs-fmt/issues/201
+    (fetchpatch {
+      url = "https://github.com/nix-community/nixpkgs-fmt/commit/648f46e1d5507592b246311618f467da282bf1b5.patch";
+      sha256 = "18n4criyl0lydxmjqfkcmwx0pniyqzfgfxcjwz6czqwmx5y7b4rb";
+    })
+  ];
+
   cargoSha256 = "15m40d9354412h51zn806pxsqjai48xiw8chf8slbi0cjxd268j9";
 
   meta = with lib; {