From e5776ce9a15fd54fd153423ff8b442b00fe2a978 Mon Sep 17 00:00:00 2001
From: David Arnold <dgx.arnold@gmail.com>
Date: Mon, 2 Aug 2021 22:11:37 -0500
Subject: [PATCH] fix: check wrapper

---
 shell.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/shell.nix b/shell.nix
index e590c46..dd378a6 100644
--- a/shell.nix
+++ b/shell.nix
@@ -61,7 +61,7 @@ let
       digga_fixture() {
         # ensure: replace input
         diggaurl=$({ grep -o '"github:divnix/digga.*"' flake.nix || true; })
-        sed -i "s|$diggaurl|$tempdigga|g" flake.nix
+        [ -z $diggaurl ] || sed -i "s|$diggaurl|$tempdigga|g" flake.nix
       }
 
       trap_err() {