1 files changed, 55 insertions, 0 deletions
diff --git a/lib/mkMultiMCPack.nix b/lib/mkMultiMCPack.nix
new file mode 100644
index 0000000..0c28d6c
--- /dev/null
+++ b/lib/mkMultiMCPack.nix
@@ -0,0 +1,55 @@
+{
+  lib,
+  stdenvNoCC,
+  zip,
+  strip-nondeterminism,
+  packwiz-installer-bootstrap,
+}: {
+  pname ? null,
+  version ? "",
+  src ? null,
+  extraFiles ? {},
+  instanceCfg,
+  ...
+} @ args:
+stdenvNoCC.mkDerivation (finalAttrs:
+    {
+      pname = src.pname or pname;
+      version = src.version or version;
+
+      dontUnpack = true;
+      dontConfig = true;
+      dontBuild = true;
+
+      nativeBuildInputs = [zip];
+
+      installPhase = let
+        modpackFiles =
+          {
+            "packwiz-installer-bootstrap.jar" = packwiz-installer-bootstrap;
+            "instance.cfg" = instanceCfg;
+          }
+          // extraFiles;
+      in
+        ''
+          runHook preInstall
+
+          mkdir -p $out
+          tmp="$(mktemp -d)"
+        ''
+        + (lib.concatLines (
+          lib.mapAttrsToList
+          (name: file: ''
+            mkdir -p "$tmp"/"$(dirname ${name})"
+            cp -as ${file} "$tmp"/${name}
+          '')
+          modpackFiles
+        ))
+        + ''
+				  cd "$tmp"
+          zip -r $out/${finalAttrs.pname}-${finalAttrs.version}.zip {*,.*}
+
+          ${lib.getExe strip-nondeterminism} $out/${finalAttrs.pname}-${finalAttrs.version}.zip
+        '';
+    }
+    // args)