feat(lib): add __functor and systemDependent lib

lib/overlay.nix

@@ -1,6 +1,25 @@
 { self, ... }@inputs:
+myLib: lib:
+let
+  systemDependent = {
+    appendSystem = system: x: "${x}-${system}";
+  };
+in
+{
+
+  inherit systemDependent;
+
+  __functor =
+    self: system:
+    let
+      systemDependent = builtins.mapAttrs (_: v: v system) self.sysDependantFuncs;
+    in
+    self
+    // {
+      inherit systemDependent;
+    }
+    // systemDependent;
 
-myLib: lib: {
   overlay = import ./overlay.nix inputs;
 
   wrench = lib.flip lib.pipe;
@@ -135,3 +154,4 @@ myLib: lib: {
       };
 
 }
+// systemDependent

packages/papermc/package.nix

@@ -37,16 +37,5 @@ stdenvNoCC.mkDerivation (finalAttrs: {
   preferLocalBuild = true;
   allowSubstitutes = false;
 
-  meta = {
+  meta.mainProgram = "minecraft-server";
-    description = "High-performance Minecraft Server";
-    homepage = "https://papermc.io/";
-    sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];
-    license = lib.licenses.gpl3Only;
-    platforms = lib.platforms.unix;
-    maintainers = with lib.maintainers; [
-      aaronjanse
-      neonfuz
-    ];
-    mainProgram = "minecraft-server";
-  };
 })