Nix: package prism dependency

contrib/package/nix/deps/prism/default.nix

@@ -0,0 +1,35 @@
+{ stdenvNoCC, fetchFromGitHub, python3 }: stdenvNoCC.mkDerivation rec {
+  name = "prism";
+  version = "1.29.0";
+
+  src = fetchFromGitHub {
+    owner = "PrismJS";
+    repo = "prism";
+    tag = "v${version}";
+    hash = "sha256-KEoICg4xviKsmN9M8ceJdAJ1NhTO7urDJnJknuP4GoQ=";
+  };
+
+  nativeBuildInputs = [ python3 ];
+
+  depsScriptDir = ../../../../../scripts/deps-docker;
+
+  postUnpack = ''
+    cp ${depsScriptDir}/genprism.* .
+  '';
+
+  postPatch = ''
+    substituteInPlace ../genprism.sh \
+      --replace-fail "/z/dist" "$out" \
+      --replace-fail 'prism-$1' "$src" \
+      --replace-fail "./genprism.py" "python3 ./genprism.py"
+  '';
+
+  buildPhase = ''
+    mkdir $out
+    cd ..
+    bash ./genprism.sh ${version}
+  '';
+
+  # genprism.sh already moves things into place
+  dontInstall = true;
+}

contrib/package/nix/overlay.nix

@@ -11,6 +11,7 @@ final: prev: {
   copyparty-fonts = final.callPackage ./deps/copyparty-fonts { };
   asmcrypto = final.callPackage ./deps/asmcrypto { };
   hash-wasm = final.callPackage ./deps/hash-wasm { };
+  prism = final.callPackage ./deps/prism { };
 
   python3 = prev.python3.override {
     packageOverrides = pyFinal: pyPrev: {