From 0db25e4de9c105db95a79600e0928089a089aa9b Mon Sep 17 00:00:00 2001
From: Bryan Bennett <Bryan.Bennett@protonmail.com>
Date: Tue, 6 Dec 2022 15:05:52 -0500
Subject: [PATCH] Don't track $nixfile if it is empty

---
 direnvrc              | 7 ++++---
 tests/test_use_nix.py | 5 +++++
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/direnvrc b/direnvrc
index 4b81a49..3acb8f7 100644
--- a/direnvrc
+++ b/direnvrc
@@ -336,9 +336,10 @@ use_nix() {
     esac
   done
 
-  # nixfile may be empty,
-  # but nix_direnv_watch_file checks for existence before adding to watches
-  nix_direnv_watch_file "$HOME/.direnvrc" "$HOME/.config/direnv/direnvrc" .envrc "$nixfile"
+  nix_direnv_watch_file "$HOME/.direnvrc" "$HOME/.config/direnv/direnvrc" ".envrc"
+  if [ -e "$nixfile" ]; then
+    nix_direnv_watch_file "$nixfile"
+  fi
 
   local need_update=0
   local file=
diff --git a/tests/test_use_nix.py b/tests/test_use_nix.py
index 98cb351..3422f9a 100644
--- a/tests/test_use_nix.py
+++ b/tests/test_use_nix.py
@@ -33,5 +33,10 @@ def test_args(direnv_project: DirenvProject) -> None:
     direnv_exec(direnv_project, "echo $SHOULD_BE_SET")
 
 
+def test_no_files(direnv_project: DirenvProject) -> None:
+    direnv_project.setup_envrc("use nix -p hello")
+    direnv_exec(direnv_project, "hello")
+
+
 if __name__ == "__main__":
     unittest.main()