init: public

modules/nix.nix

@@ -0,0 +1,54 @@
+{
+  inputs,
+  config,
+  lib,
+  ...
+}:
+lib.my.makeSwitch {
+  inherit config;
+  default = true;
+  optionName = "default nix settings";
+  optionPath = [ "nix" ];
+  config' = {
+    # This will add each flake input as a registry
+    # To make nix3 commands consistent with your flake
+    nix.registry = (lib.mapAttrs (_: flake: { inherit flake; })) (
+      (lib.filterAttrs (_: lib.isType "flake")) inputs
+    );
+
+    # This will additionally add your inputs to the system's legacy channels
+    # Making legacy nix commands consistent as well, awesome!
+    nix.nixPath = [ "/etc/nix/path" ];
+
+    nix.settings = {
+      # Enable flakes and new 'nix' command
+      experimental-features = "nix-command flakes";
+      # Deduplicate and optimize nix store
+      auto-optimise-store = true;
+      substituters = lib.mkForce [
+        # "https://mirrors.tuna.tsinghua.edu.cn/nix-channels/store"
+        # "https://mirror.sjtu.edu.cn/nix-channels/store"
+        "https://mirrors.sjtug.sjtu.edu.cn/nix-channels/store"
+        "https://mirrors.ustc.edu.cn/nix-channels/store"
+        "https://nix-community.cachix.org"
+        "https://cache.nixos.org"
+      ];
+      trusted-public-keys = [
+        "nix-community.cachix.org-1:mB9FSh9qf2dCimDSUo8Zy7bkq5CX+/rkCWyvRCYg3Fs="
+      ];
+    };
+
+    /*
+      nix.gc = {
+        automatic = true;
+        dates = "weekly";
+        options = "--delete-older-than 30d";
+      };
+    */
+
+    environment.etc = lib.mapAttrs' (name: value: {
+      name = "nix/path/${name}";
+      value.source = value.flake;
+    }) config.nix.registry;
+  };
+}