From bd88d8382c70f6a5b0e8518d78fb64af2172a9f3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Moritz=20B=C3=B6hme?= <mail@moritzboeh.me>
Date: Thu, 11 May 2023 21:48:38 +0200
Subject: [PATCH] refactor(flake): hand roll flake

---
 flake.lock                     |  23 +----
 flake.nix                      | 152 +++++++++++++++++++--------------
 hosts/nixos-desktop/system.nix |   1 +
 hosts/nixos-laptop/system.nix  |   1 +
 overlays/channels.nix          |  12 ---
 5 files changed, 89 insertions(+), 100 deletions(-)
 create mode 100644 hosts/nixos-desktop/system.nix
 create mode 100644 hosts/nixos-laptop/system.nix
 delete mode 100644 overlays/channels.nix

diff --git a/flake.lock b/flake.lock
index 3577110..b514e2c 100644
--- a/flake.lock
+++ b/flake.lock
@@ -980,8 +980,7 @@
         "nvim-treesitter-textsubjects": "nvim-treesitter-textsubjects",
         "pre-commit-hooks": "pre-commit-hooks",
         "smartcolumn-nvim": "smartcolumn-nvim",
-        "stable": "stable",
-        "utils": "utils"
+        "stable": "stable"
       }
     },
     "rust-overlay": {
@@ -1083,26 +1082,6 @@
         "type": "github"
       }
     },
-    "utils": {
-      "inputs": {
-        "flake-utils": [
-          "flake-utils"
-        ]
-      },
-      "locked": {
-        "lastModified": 1657226504,
-        "narHash": "sha256-GIYNjuq4mJlFgqKsZ+YrgzWm0IpA4axA3MCrdKYj7gs=",
-        "owner": "gytis-ivaskevicius",
-        "repo": "flake-utils-plus",
-        "rev": "2bf0f91643c2e5ae38c1b26893ac2927ac9bd82a",
-        "type": "github"
-      },
-      "original": {
-        "owner": "gytis-ivaskevicius",
-        "repo": "flake-utils-plus",
-        "type": "github"
-      }
-    },
     "wlroots": {
       "flake": false,
       "locked": {
diff --git a/flake.nix b/flake.nix
index e5115ea..dde8687 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,8 +13,6 @@
     stable.url = "github:nixos/nixpkgs/nixos-22.11";
 
     flake-utils.url = "github:numtide/flake-utils";
-    utils.url = "github:gytis-ivaskevicius/flake-utils-plus";
-    utils.inputs.flake-utils.follows = "flake-utils";
 
     agenix.inputs.nixpkgs.follows = "nixpkgs";
     agenix.url = "github:ryantm/agenix";
@@ -79,50 +77,51 @@
      ║                         Outputs                          ║
      ╚══════════════════════════════════════════════════════════╝
   */
-  outputs =
-    inputs@{ self, nixpkgs, utils, ... }:
-    utils.lib.mkFlake {
-      inherit self inputs;
+  outputs = inputs@{ self, nixpkgs, ... }:
+    let
+      systems = [ "x86_64-linux" "aarch64-linux" ];
 
-      supportedSystems = [ "x86_64-linux" ];
-
-      channelsConfig.allowUnfree = true;
+      forEachSystem = lib.genAttrs systems;
 
       lib = nixpkgs.lib.extend
         (self: _: { my = import ./lib { lib = self; }; });
 
-      /*
-         ╔══════════════════════════════════════════════════════════╗
-         ║                         Overlays                         ║
-         ╚══════════════════════════════════════════════════════════╝
-      */
       overlay = import ./overlays {
         inherit inputs;
         inherit (self) lib;
       };
 
-      channels.nixpkgs.overlaysBuilder = _: [
+      config.allowUnfree = true;
+
+      overlays = [
         inputs.hypr-contrib.overlays.default
         inputs.hyprland.overlays.default
         inputs.neovim-nightly-overlay.overlay
-        inputs.utils.overlay
-        self.overlay
+        overlay
       ];
 
-      overlays = utils.lib.exportOverlays
-        {
-          inherit (self) pkgs inputs;
-        } // {
-        default = self.overlay;
+      pkgsFor = system: import nixpkgs {
+        inherit system config;
+        overlays = overlays ++ [
+          (
+            _: prev: {
+              master = import inputs.master {
+                inherit (prev) system;
+                inherit overlays config;
+              };
+              stable = import inputs.stable {
+                inherit (prev) system;
+                inherit overlays config;
+              };
+            }
+          )
+          overlay
+        ];
       };
 
-      /*
-         ╔══════════════════════════════════════════════════════════╗
-         ║                         Modules                          ║
-         ╚══════════════════════════════════════════════════════════╝
-      */
-      hostDefaults.modules = [
-        ./modules/default.nix
+      defaultModules = [
+        { nixpkgs = { inherit config; }; }
+        ./modules
         inputs.home-manager.nixosModule
         {
           home-manager = {
@@ -134,45 +133,66 @@
         inputs.agenix.nixosModules.age
       ];
 
-
-      hosts.nixos-laptop.modules = [
-        ./hosts/nixos-laptop
-      ];
-
-
-      hosts.nixos-desktop.modules = [
-        ./hosts/nixos-desktop
-      ];
-
-      /*
-         ╔══════════════════════════════════════════════════════════╗
-         ║                      Other Outputs                       ║
-         ╚══════════════════════════════════════════════════════════╝
-      */
-      outputsBuilder = channels:
-        with channels.nixpkgs; {
-          devShells.default = mkShell {
-            inherit (self.checks.${system}.pre-commit-check) shellHook;
-            name = "dotfiles";
-            packages = [
-              # Secrets
-              pkgs.agenix
-              # cachix
-              cachix
-            ];
-          };
-
-          checks.pre-commit-check = inputs.pre-commit-hooks.lib."${system}".run {
-            src = ./.;
-            hooks = {
-              nixpkgs-fmt.enable = true;
-              statix.enable = true;
-              shellcheck.enable = true;
-              stylua.enable = true;
+      hosts = self.lib.my.mapModules
+        (path:
+          let
+            system = import "${path}/system.nix";
+            pkgs = pkgsFor system;
+          in
+          lib.nixosSystem {
+            inherit pkgs system lib;
+            specialArgs = {
+              inherit inputs;
             };
-          };
+            modules = defaultModules ++ [ path ];
+          })
+        ./hosts;
 
-          packages = utils.lib.exportPackages self.overlays channels;
+      pre-commit-check = system: inputs.pre-commit-hooks.lib."${system}".run {
+        src = ./.;
+        hooks = {
+          nixpkgs-fmt.enable = true;
+          statix.enable = true;
+          shellcheck.enable = true;
+          stylua.enable = true;
         };
+      };
+    in
+    with lib; {
+      inherit lib;
+
+      pkgs = genAttrs systems pkgsFor;
+
+      # ╔══════════════════════════════════════════════════════════╗
+      # ║                   NixOS Configurations                   ║
+      # ╚══════════════════════════════════════════════════════════╝
+
+      nixosConfigurations = hosts;
+
+      # ╔══════════════════════════════════════════════════════════╗
+      # ║                      Other Outputs                       ║
+      # ╚══════════════════════════════════════════════════════════╝
+
+      devShells = forEachSystem (system:
+        let
+          pkgs = pkgsFor system;
+        in
+        {
+          default = pkgs.mkShell
+            {
+              inherit (pre-commit-check system) shellHook;
+              name = "dotfiles";
+              packages = with pkgs; [
+                # Secrets
+                agenix
+                # cachix
+                cachix
+              ];
+            };
+        });
+
+      checks = forEachSystem (system: {
+        pre-commit-check = pre-commit-check system;
+      });
     };
 }
diff --git a/hosts/nixos-desktop/system.nix b/hosts/nixos-desktop/system.nix
new file mode 100644
index 0000000..132026a
--- /dev/null
+++ b/hosts/nixos-desktop/system.nix
@@ -0,0 +1 @@
+"x86_64-linux"
diff --git a/hosts/nixos-laptop/system.nix b/hosts/nixos-laptop/system.nix
new file mode 100644
index 0000000..132026a
--- /dev/null
+++ b/hosts/nixos-laptop/system.nix
@@ -0,0 +1 @@
+"x86_64-linux"
diff --git a/overlays/channels.nix b/overlays/channels.nix
deleted file mode 100644
index 5c2a49a..0000000
--- a/overlays/channels.nix
+++ /dev/null
@@ -1,12 +0,0 @@
-{ inputs, ... }:
-
-_: prev: {
-  master = import inputs.master {
-    inherit (prev) system;
-    config.allowUnfree = true;
-  };
-  stable = import inputs.stable {
-    inherit (prev) system;
-    config.allowUnfree = true;
-  };
-}