flake(overlays): modularize with flake-parts

flake.nix

@@ -131,6 +131,7 @@
           ./flake
           ./lib/nixfiles/module.nix
           ./pkgs/module.nix
+          ./overlays
         ];
 
         config = {
@@ -221,44 +222,6 @@
 
             # inputs is already defined
             lib = nixpkgs.lib;
-            systems = ["x86_64-linux" "aarch64-linux"];
-
-            overlays = let
-              nix-minecraft-patched-overlay = let
-                normal = inputs.nix-minecraft-upstream.overlays.default;
-                quilt = inputs.nix-minecraft.overlays.default;
-              in
-                lib.composeExtensions
-                normal
-                (final: prev: let
-                  x = quilt final prev;
-                in {
-                  inherit (x) quiltServers quilt-server;
-                  minecraftServers = prev.minecraftServers // x.quiltServers;
-                });
-            in [
-              (final: prev: let
-                packages = import ./pkgs {inherit (prev) pkgs;};
-              in {
-                inherit (packages) mopidy-autoplay google-fonts;
-                atool-wrapped = packages.atool;
-              })
-
-              # various temporary fixes that automatically revert
-              self.overlays.mitigations
-
-              # auto backports from nixpkgs unstable
-              self.overlays.backports
-
-              # modpacks (keeps modpack version in sync between hosts so i can reverse
-              # proxy create track map because it's broken)
-              self.overlays.modpacks
-
-              inputs.hyprwm-contrib.overlays.default
-              inputs.rust-overlay.overlays.default
-              inputs.nixfiles-assets.overlays.default
-              nix-minecraft-patched-overlay
-            ];
 
             # function to generate packages for each system
             eachSystem = lib.genAttrs (import inputs.systems);
@@ -305,8 +268,6 @@
                 inherit system;
               });
 
-            overlays = import ./overlays self;
-
             nixosConfigurations = {
               iso = mkISOSystem "x86_64-linux";
             }; # end nixosConfigurations

overlays/backports.nix

@@ -1,35 +1,58 @@
-nixfiles: final: prev:
-let
-  pkgs-unstable = import nixfiles.inputs.nixpkgs-unstable { config.allowUnfree = true; inherit (final) system; };
+{
+  config,
+  lib,
+  self,
+  inputs,
+  ...
+}: let
+  # TODO legacy refactor
+  # not high priority, this still works well for this overlay.
+  nixfiles = self;
+  overlay = final: prev: let
+    pkgs-unstable = import nixfiles.inputs.nixpkgs-unstable {
+      config.allowUnfree = true;
+      inherit (final) system;
+    };
     inherit (final) callPackage kdePackages lib;
 
     backport = let
       _callPackage = callPackage;
-  in {  pkgname,
+    in
+      {
+        pkgname,
         callPackage ? _callPackage,
         new ? pkgs-unstable,
-        override ? {} } : let
+        override ? {},
+      }: let
         inherit (lib) getAttrFromPath;
         inherit (builtins) getAttr isString;
 
-    getAttr' = name: attrs: if isString pkgname then getAttr name attrs else getAttrFromPath name attrs;
+        getAttr' = name: attrs:
+          if isString pkgname
+          then getAttr name attrs
+          else getAttrFromPath name attrs;
         oldPkg = getAttr' pkgname prev;
         newPkg = getAttr' pkgname pkgs-unstable;
-  in if oldPkg.version == newPkg.version
+      in
+        if oldPkg.version == newPkg.version
         then oldPkg
         else (callPackage newPkg.override) override;
 
     backport' = pkgname: backport {inherit pkgname;};
 
     # defined locally to not pull in perl from unstable
-  stripJavaArchivesHook = final.makeSetupHook {
+    stripJavaArchivesHook =
+      final.makeSetupHook {
         name = "strip-java-archives-hook";
         propagatedBuildInputs = [final.strip-nondeterminism];
-  } ./strip-java-archives.sh;
-
+      }
+      ./strip-java-archives.sh;
   in {
     vesktop = backport' "vesktop";
-  obsidian = backport { pkgname="obsidian"; override.electron = final.electron_28; };
+    obsidian = backport {
+      pkgname = "obsidian";
+      override.electron = final.electron_28;
+    };
     prismlauncher-unwrapped = backport {
       pkgname = "prismlauncher-unwrapped";
       inherit (kdePackages) callPackage;
@@ -39,4 +62,7 @@ in {
         inherit (final.darwin.apple_sdk.frameworks) Cocoa;
       };
     };
+  };
+in {
+  config.flake.overlays.backports = overlay;
 }

overlays/default.nix

@@ -1,17 +1,20 @@
-nixfiles:
-let
-  inherit (nixfiles.inputs.nixpkgs) lib;
-  # this name is awful. maybe i don't know anything about functional
-  # programming or something, but the naming isn't very self explanatory
-  # - why is it "compose" instead of "combine"
-  # - why is it "extensions" instead of "overlays"
+{
+  config,
+  lib,
+  ...
+}: let
   inherit (lib) composeManyExtensions;
-in rec {
-  backports = import ./backports.nix nixfiles;
-  mitigations = import ./mitigations.nix nixfiles;
-  modpacks = import ./modpacks.nix nixfiles;
-  default = composeManyExtensions [
+  cfg = config.flake.overlays;
+in {
+  imports = [
+    ./mitigations.nix
+    ./backports.nix
+    ./modpacks.nix
+  ];
+  config.flake.overlays = {
+    default = with cfg; composeManyExtensions [
       backports
       mitigations
     ];
+  };
 }

overlays/mitigations.nix

@@ -1,23 +1,49 @@
-nixfiles: final: prev:
-let
+{
+  config,
+  lib,
+  self,
+  inputs,
+  ...
+}: let
+  # TODO legacy refactor
+  # not high priority, this still works well for this overlay.
+  nixfiles = self;
+  overlay = final: prev: let
     pkgsStable = import nixfiles.inputs.nixpkgs.outPath {inherit (prev) system;};
     updateTime = nixfiles.inputs.nixpkgs-unstable.lastModified;
 
     inherit (final) lib callPackage fetchFromGitHub;
-  inherit (lib) recurseIntoAttrs optionalAttrs
-    versionOlder versionAtLeast;
+    inherit
+      (lib)
+      recurseIntoAttrs
+      optionalAttrs
+      versionOlder
+      versionAtLeast
+      ;
 
     pkgsFromFlake = flake: (import flake.outPath) {inherit (prev) system;};
     pkgsFromInput = name: pkgsFromFlake nixfiles.inputs.${name};
-  pickFixed = ours: theirs: if versionAtLeast ours.version theirs.version then ours else theirs;
-  pickNewer = ours: theirs: if versionOlder theirs.version ours.version then ours else theirs;
+    pickFixed = ours: theirs:
+      if versionAtLeast ours.version theirs.version
+      then ours
+      else theirs;
+    pickNewer = ours: theirs:
+      if versionOlder theirs.version ours.version
+      then ours
+      else theirs;
 
     hold = now: days: ours: theirs: let
       seconds = days * 24 * 60 * 60;
       endTimestamp = now + seconds;
-    in if now < endTimestamp then ours else theirs;
+    in
+      if now < endTimestamp
+      then ours
+      else theirs;
 
-  optionalPkg = cond: val: if cond then val else null;
+    optionalPkg = cond: val:
+      if cond
+      then val
+      else null;
 
     gimp-with-plugins-good = let
       badPlugins = ["gap"];
@@ -25,15 +51,16 @@ let
       pluginFilter = name: value: (value.type or null == "derivation") && (!(itemInList badPlugins name)) && (!value.meta.broken);
       filteredPlugins = lib.filterAttrs pluginFilter prev.gimpPlugins;
       plugins = lib.mapAttrsToList (_: v: v) filteredPlugins;
-  in prev.gimp-with-plugins.override { inherit plugins; };
-
+    in
+      prev.gimp-with-plugins.override {inherit plugins;};
     # this also causes an infinite recursion and i have no idea why
     # in nixfiles.inputs.nixpkgs.lib.filterAttrs (k: v: v != null) {
   in {
     nix-du = let
       old = prev.nix-du;
       new = (pkgsFromInput "nixpkgs-nix-du").nix-du;
-  in pickNewer old new;
+    in
+      pickNewer old new;
 
     gimp-with-plugins = gimp-with-plugins-good;
 
@@ -41,16 +68,22 @@ in {
       stable = pkgsStable.nwg-displays;
       unstable = prev.nwg-displays;
       now = 1739114541;
-  in hold now 7 stable unstable;
+    in
+      hold now 7 stable unstable;
 
     libreoffice = let
       stable = pkgsStable.libreoffice;
       unstable = prev.libreoffice;
       now = 1739558971;
-  in hold now 7 stable unstable;
+    in
+      hold now 7 stable unstable;
 
     redlib = let
       redlib-new = final.callPackage nixfiles.packages.${prev.system}.redlib.override {};
       inherit (prev) redlib;
-  in pickNewer redlib-new redlib;
+    in
+      pickNewer redlib-new redlib;
+  };
+in {
+  config.flake.overlays.mitigations = overlay;
 }

overlays/modpacks.nix

@@ -1,11 +1,21 @@
-nixfiles: final: prev:
-let
+{
+  config,
+  lib,
+  self,
+  inputs,
+  ...
+}: let
+  # TODO legacy refactor
+  # not high priority, this still works well for this overlay.
+  nixfiles = self;
+  overlay = final: prev: let
     inherit (final) lib;
     inherit (lib) fakeHash;
     notlite = let
       commit = "0e42bfbc6189db5848252d7dc7a638103d9d44ee";
       packHash = "sha256-X9a7htRhJcSRXu4uDvzSjdjCyWg+x7Dqws9pIlQtl6A=";
-  in final.fetchPackwizModpack {
+    in
+      final.fetchPackwizModpack {
         url = "https://gitea.protogen.io/nullbite/notlite/raw/commit/${commit}/pack.toml";
         inherit packHash;
       };
@@ -24,4 +34,7 @@ in {
     modpacks = {
       inherit notlite notlite-ctm-static;
     };
+  };
+in {
+  config.flake.overlays.modpacks = overlay;
 }