flake: remove control character from file by using fromJSON

I was reminded by various evil things puck did to the evaluator
involving null bytes that you can get funny bytes by abusing JSON
parsing. It's neater than putting binary in the source file, so let's do
it.

Change-Id: I1ff2e0d829eb303fbed81fa2ebb3a39412e89ff1

1 files changed, 1 insertions, 1 deletions

diff --git a/flake.nix b/flake.nix
index d2173cf47..a1fc947b7 100644
--- a/flake.nix
+++ b/flake.nix
@@ -33,7 +33,7 @@
 
       # This notice gets echoed as a dev shell hook, and can be turned off with
       # `touch .nocontribmsg`
-      sgr = ''['';
+      sgr = builtins.fromJSON ''"\u001b["'';
       freezePage = "https://wiki.lix.systems/books/lix-contributors/page/freezes-and-recommended-contributions";
       codebaseOverview = "https://wiki.lix.systems/books/lix-contributors/page/codebase-overview";
       contribNotice = builtins.toFile "lix-contrib-notice" ''