gmic-qt: fix updateScript

pkgs/tools/graphics/gmic-qt/default.nix

@@ -3,23 +3,27 @@
 , fetchzip
 , cimg
 , cmake
+, coreutils
 , curl
 , fftw
 , gimp
 , gimpPlugins
 , gmic
+, gnugrep
+, gnused
 , graphicsmagick
 , libjpeg
 , libpng
 , libtiff
 , ninja
-, nix-update-script
+, nix-update
 , opencv3
 , openexr
 , pkg-config
 , qtbase
 , qttools
 , wrapQtAppsHook
+, writeShellScript
 , zlib
 , variant ? "standalone"
 }:
@@ -108,7 +112,23 @@ stdenv.mkDerivation (finalAttrs: {
       inherit cimg gmic;
     };
 
-    updateScript = nix-update-script { };
+    updateScript = writeShellScript "gmic-qt-update-script" ''
+      set -euo pipefail
+
+      export PATH="${lib.makeBinPath [ coreutils curl gnugrep gnused nix-update ]}:$PATH"
+
+      latestVersion=$(curl 'https://gmic.eu/files/source/' \
+                       | grep -E 'gmic_[^"]+\.tar\.gz' \
+                       | sed -E 's/.+<a href="gmic_([^"]+)\.tar\.gz".+/\1/g' \
+                       | sort --numeric-sort --reverse | head -n1)
+
+      if [[ '${finalAttrs.version}' = "$latestVersion" ]]; then
+          echo "The new version same as the old version."
+          exit 0
+      fi
+
+      nix-update --version "$latestVersion"
+    '';
   };
 
   meta = {