rework overlays handling

lib/default.nix

@@ -3,23 +3,21 @@ let
   lib = nixpkgs.lib.extend (import ./extended.nix inputs);
 
   inherit (builtins) mapAttrs readDir listToAttrs;
-  inherit (lib) genAttrs pkgFromSystem pkgsFromSystem;
+  inherit (lib) genAttrs pkgFromSystem pkgsFromSystem loadOverlays;
 
   inherit (import ./find-modules.nix { inherit lib; }) findModulesList;
   inherit (import ./generators.nix { inherit lib self inputs; }) mkIso mkSystem;
   #supportedSystems = ["x86_64-linux" "x86_64-darwin" "aarch64-linux" "aarch64-darwin"];
   supportedSystems = [ "x86_64-linux" ];
+
   forAllSystems =
-    f:
+    fn:
     genAttrs supportedSystems (
       system:
-      f (
+      fn (
         import nixpkgs {
           inherit system;
-          overlays = [
-            inputs.nim2nix.overlays.default
-            (import ../overlays/nimble { inherit inputs; })
-          ];
+          overlays = (import ../overlays { inherit inputs loadOverlays; });
         }
       )
     );
@@ -62,13 +60,13 @@ let
         ];
       };
     });
-    checks = forAllSystems (
-      pkgs:
-      import ./checks.nix {
-        inherit inputs lib self;
-        system = pkgs.system;
-      }
-    );
+    # checks = forAllSystems (
+    #   pkgs:
+    #   import ./checks.nix {
+    #     inherit inputs lib self;
+    #     system = pkgs.system;
+    #   }
+    # );
     formatter = forAllSystems (pkgs: pkgs.nixfmt-rfc-style);
   };
 in

lib/extended.nix

@@ -3,8 +3,11 @@ let
   inherit (builtins)
     listToAttrs
     substring
-    filter
     replaceStrings
+    map
+    filter
+    attrNames
+    readDir
     ;
   inherit (final)
     concatStringsSep
@@ -106,6 +109,12 @@ let
     pkg = pkgFromSystem system;
   };
 
+  loadOverlays =
+    inputs: dir: readDir dir
+    |> attrNames
+    |> filter (f: f != "default.nix")
+    |> map (f: import (../overlays + "/${f}") { inherit inputs; });
+
 in
 {
   inherit
@@ -125,5 +134,6 @@ in
     overlayFrom
     flakeFromSystem
     listify
+    loadOverlays
     ;
 }

lib/generators.nix

@@ -49,14 +49,6 @@ let
     nixosSystem {
       system = "x86_64-linux";
       modules = [
-        # TODO: clean this up
-        (
-          { ... }:
-          {
-            nixpkgs.overlays = [ inputs.nim2nix.overlays.default ];
-          }
-        )
-        ../overlays
         ../modules/oizys.nix
         inputs.lix-module.nixosModules.default
         inputs.hyprland.nixosModules.default

modules/languages/nim.nix

@@ -15,8 +15,6 @@ in
       with pkgs;
       [
         nim
-
-        nim-atlas
         nimble
       ]
       ++ [ nimlangserver ];

modules/oizys.nix

@@ -1,11 +1,12 @@
 {
+  inputs,
   lib,
   self,
   hostName,
   ...
 }:
 let
-  inherit (lib) mkEnableOption mkOption;
+  inherit (lib) mkEnableOption mkOption loadOverlays;
 in
 {
   imports = with self.nixosModules; [
@@ -54,5 +55,6 @@ in
   config = {
     networking.hostName = hostName;
     time.timeZone = "US/Central";
+    nixpkgs.overlays = import ../overlays { inherit inputs loadOverlays; };
   };
 }

overlays/default.nix

@@ -1,33 +1,11 @@
-{ inputs, ... }:
-let
-  inherit (builtins)
-    map
-    filter
-    attrNames
-    readDir
-    elem
-    ;
-  # execute and import all overlay files in the current
-  # directory with the given args
-  # overlays =
-  #    map
-  #     (f: (import (./. + "/${f}") { inherit inputs; }))
-  #     (filter (f: f != "default.nix") (attrNames (readDir ./.)));
-  ignore = ["nimlangserver"];
-  overlays =
-    readDir ./.
-    |> attrNames
-    |> filter (f: f != "default.nix" || elem f ignore)
-    |> map (f: import (./. + "/${f}") { inherit inputs; });
-
-in
-{
-  nixpkgs.overlays = overlays ++ [
+{ inputs, loadOverlays }:
+(loadOverlays inputs ./.)
+++ [
+  inputs.nim2nix.overlays.default # adds buildNimPackage
   (final: _prev: {
     stable = import inputs.stable {
       system = final.system;
       config.allowUnfree = true;
     };
   })
-  ];
-}
+]

overlays/nim-atlas/default.nix

@@ -1,12 +0,0 @@
-{ ... }:
-(final: prev: {
-  nim-atlas = prev.nim-atlas.overrideNimAttrs {
-    version = "unstable";
-    src = final.fetchFromGitHub {
-      owner = "nim-lang";
-      repo = "atlas";
-      rev = "cbba9fa77fa837931bf3c58e20c1f8cb15a22919";
-      hash = "sha256-TsZ8TriVuKEY9/mV6KR89eFOgYrgTqXmyv/vKu362GU=";
-    };
-  };
-})