From f68daad7db1897fc35ac4c17e5373c72b56db6c6 Mon Sep 17 00:00:00 2001
From: EuAndreh <eu@euandre.org>
Date: Sat, 1 Jun 2019 09:12:44 -0300
Subject: Add fallback null value to the shelcheck derivation input

---
 utils.nix | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/utils.nix b/utils.nix
index 8c63cc9..fd25021 100644
--- a/utils.nix
+++ b/utils.nix
@@ -14,11 +14,13 @@ in rec {
     '';
   };
   shellcheck = ignoredFindPattern:
-  baseTask.overrideAttrs (baseAttrs: {
+  baseTask.overrideAttrs (baseAttrs: rec {
     name = "${baseAttrs.name}-shellcheck";
     buildInputs = baseAttrs.buildInputs ++ [ pkgs.shellcheck ];
+    ignoredPattern =
+    if ignoredFindPattern == null then "" else ignoredFindPattern;
     buildPhase = ''
-      find . -type f \( -name '*.sh' -and -regextype egrep ! -regex '${ignoredFindPattern}' \) -print0 | xargs -0 shellcheck
+      find . -type f \( -name '*.sh' -and -regextype egrep ! -regex '${ignoredPattern}' \) -print0 | xargs -0 shellcheck
       touch $out
     '';
   });
-- 
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