Improve cpp nix builder

codecs/mozjpeg/flake.nix

@@ -18,35 +18,24 @@
       system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        inherit (pkgs) stdenv runCommand writeShellScriptBin;
+        inherit (pkgs) callPackage stdenv;
+
+        buildSquooshCppCodec = callPackage (import ../../nix/squoosh-cxx-builder) {};
+        mkInstallable = callPackage (import ../../nix/mk-installable) {};
+        
       in
-      rec {
+      mkInstallable {
         packages = rec {
+
           default = mozjpeg-squoosh;
-          mozjpeg-squoosh = stdenv.mkDerivation {
+          mozjpeg-squoosh = buildSquooshCppCodec {
             name = "mozjpeg-squoosh";
-            # Only copy files that are actually relevant to avoid unnecessary
-            # cache invalidations.
-            src = runCommand "src" { } ''
-              mkdir $out
-              cp -r ${./.}/enc $out/
-              cp ${./.}/Makefile $out/
-            '';
-            nativeBuildInputs = [
-              pkgs.emscripten
-              pkgs.mozjpeg
-            ];
+            src = ./.;
             MOZJPEG = mozjpeg;
             dontConfigure = true;
-            buildPhase = ''
-              export HOME=$TMPDIR
-              emmake make -j$(nproc)
-            '';
-            installPhase = ''
-              mkdir -p $out
-              cp -r enc $out
-            '';
+            decoder = null;
           };
+
           mozjpeg = stdenv.mkDerivation {
             name = "mozjpeg";
             src = mozjpeg-src;
@@ -82,17 +71,6 @@
             '';
             dontFixup = true;
           };
-          installScript = writeShellScriptBin "install.sh" ''
-            ${pkgs.coreutils}/bin/rm -rf wasm_build
-            ${pkgs.coreutils}/bin/mkdir -p wasm_build
-            ${pkgs.rsync}/bin/rsync --chmod=u+w -r ${mozjpeg-squoosh}/* wasm_build/
-          '';
-        };
-        apps = {
-          install = {
-            type = "app";
-            program = "${packages.installScript}/bin/install.sh";
-          };
         };
       }
     );

codecs/rotate/flake.nix

@@ -16,7 +16,7 @@
       system:
       let
         pkgs = nixpkgs.legacyPackages.${system};
-        inherit (pkgs) callPackage writeShellScriptBin;
+        inherit (pkgs) callPackage;
         
         buildSquooshRustCodec= callPackage (import ../../nix/squoosh-rust-builder) {fenix = fenix.packages.${system};};
         mkInstallable = callPackage (import ../../nix/mk-installable) {};

nix/squoosh-cxx-builder/default.nix

@@ -0,0 +1,31 @@
+{
+  pkgs,
+  stdenv,
+  runCommand,
+}:
+{
+  name,
+  src,
+  nativeBuildInputs ? [ ],
+  encoder ? "enc",
+  decoder ? "dec",
+  ...
+}@args:
+
+stdenv.mkDerivation (
+  final:
+  args
+  // {
+    inherit name src;
+    nativeBuildInputs = [ pkgs.emscripten ] ++ nativeBuildInputs;
+    buildPhase = ''
+      export HOME=$TMPDIR
+      emmake make -j$(nproc)
+    '';
+    installPhase = ''
+      mkdir -p $out
+      ${if (encoder != null) then "cp -r ${encoder} $out" else ""}
+      ${if (decoder != null) then "cp -r ${decoder} $out" else ""}
+    '';
+  }
+)