nix: refactor flake (drop flake-utils)

flake.lock

@@ -16,21 +16,6 @@
         "type": "github"
       }
     },
-    "flake-utils": {
-      "locked": {
-        "lastModified": 1642700792,
-        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
-        "type": "github"
-      },
-      "original": {
-        "owner": "numtide",
-        "repo": "flake-utils",
-        "type": "github"
-      }
-    },
     "libnbtplusplus": {
       "flake": false,
       "locked": {
@@ -49,16 +34,16 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1643169865,
-        "narHash": "sha256-+KIpNRazbc8Gac9jdWCKQkFv9bjceaLaLhlwqUEYu8c=",
+        "lastModified": 1646955661,
+        "narHash": "sha256-AYLta1PubJnrkv15+7G+6ErW5m9NcI9wSdJ+n7pKAe0=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "945ec499041db73043f745fad3b2a3a01e826081",
+        "rev": "e9545762b032559c27d8ec9141ed63ceca1aa1ac",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }
@@ -82,7 +67,6 @@
     "root": {
       "inputs": {
         "flake-compat": "flake-compat",
-        "flake-utils": "flake-utils",
         "libnbtplusplus": "libnbtplusplus",
         "nixpkgs": "nixpkgs",
         "quazip": "quazip"

flake.nix

@@ -1,50 +1,34 @@
 {
-  description = "PolyMC flake";
-  inputs.nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
-  inputs.flake-utils.url = "github:numtide/flake-utils";
-  inputs.flake-compat = {
-    url = "github:edolstra/flake-compat";
-    flake = false;
-  };
-  inputs.libnbtplusplus = {
-    url = "github:multimc/libnbtplusplus";
-    flake = false;
-  };
-  inputs.quazip = {
-    url = "github:stachenov/quazip";
-    flake = false;
+  description = "A custom launcher for Minecraft that allows you to easily manage multiple installations of Minecraft at once (Fork of MultiMC)";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-unstable";
+    flake-compat = { url = "github:edolstra/flake-compat"; flake = false; };
+    libnbtplusplus = { url = "github:multimc/libnbtplusplus"; flake = false; };
+    quazip = { url = "github:stachenov/quazip"; flake = false; };
   };
 
-  outputs = args@{ self, nixpkgs, flake-utils, libnbtplusplus, quazip, ... }:
+  outputs = { self, nixpkgs, libnbtplusplus, quazip, ... }:
     let
-      systems = [
-        "aarch64-linux"
-        # "aarch64-darwin" # qtbase is currently broken
-        "i686-linux"
-        "x86_64-darwin"
-        "x86_64-linux"
-      ];
-    in {
-      overlay = final: prev: {
-        inherit (self.packages.${final.system}) polymc;
+      # Generate a user-friendly version number.
+      version = builtins.substring 0 8 self.lastModifiedDate;
+
+      # System types to support (qtbase is currently broken for "aarch64-darwin")
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-linux" ];
+
+      # Helper function to generate an attrset '{ x86_64-linux = f "x86_64-linux"; ... }'.
+      forAllSystems = nixpkgs.lib.genAttrs supportedSystems;
+
+      # Nixpkgs instantiated for supported system types.
+      pkgs = forAllSystems (system: nixpkgs.legacyPackages.${system});
+    in
+    {
+      packages = forAllSystems (system: { polymc = pkgs.${system}.libsForQt5.callPackage ./packages/nix/polymc { inherit version self quazip libnbtplusplus; }; });
+      defaultPackage = forAllSystems (system: self.packages.${system}.polymc);
+
+      apps = forAllSystems (system: { polymc = { type = "app"; program = "${self.defaultPackage.${system}}/bin/polymc"; }; });
+      defaultApp = forAllSystems (system: self.apps.${system}.polymc);
+
+      overlay = final: prev: { polymc = self.defaultPackage.${final.system}; };
     };
-    } // flake-utils.lib.eachSystem systems (system:
-      let pkgs = import nixpkgs { inherit system; };
-      in {
-        packages = {
-          polymc = pkgs.libsForQt5.callPackage ./packages/nix/polymc {
-            inherit self;
-            submoduleQuazip = quazip;
-            submoduleNbt = libnbtplusplus;
-          };
-        };
-        apps = {
-          polymc = flake-utils.lib.mkApp {
-            name = "polymc";
-            drv = self.packages.${system}.polymc;
-          };
-        };
-        defaultPackage = self.packages.${system}.polymc;
-        defaultApp = self.apps.${system}.polymc;
-      });
 }

packages/nix/polymc/default.nix

@@ -16,8 +16,9 @@
 
   # flake
 , self
-, submoduleNbt
-, submoduleQuazip
+, version
+, libnbtplusplus
+, quazip
 }:
 
 let
@@ -38,7 +39,7 @@ in
 
 mkDerivation rec {
   pname = "polymc";
-  version = "nightly";
+  inherit version;
 
   src = lib.cleanSource self;
 
@@ -57,8 +58,8 @@ mkDerivation rec {
     # Copy submodules inputs
     rm -rf source/libraries/{libnbtplusplus,quazip}
     mkdir source/libraries/{libnbtplusplus,quazip}
-    cp -a ${submoduleNbt}/* source/libraries/libnbtplusplus
-    cp -a ${submoduleQuazip}/* source/libraries/quazip
+    cp -a ${libnbtplusplus}/* source/libraries/libnbtplusplus
+    cp -a ${quazip}/* source/libraries/quazip
     chmod a+r+w source/libraries/{libnbtplusplus,quazip}/*
   '';