From ee6a735a2c3ae69622e6e01d849802d23bb16b84 Mon Sep 17 00:00:00 2001
From: Bruno BELANYI <bruno@belanyi.fr>
Date: Tue, 21 Feb 2023 17:24:18 +0000
Subject: [PATCH] home: add nix

This is basically the same thing as the NixOS module, except for
NIX_PATH handling [1].

[1]: https://github.com/nix-community/home-manager/pull/2677
---
 home/default.nix     |  1 +
 home/nix/default.nix | 39 +++++++++++++++++++++++++++++++++++++++
 2 files changed, 40 insertions(+)
 create mode 100644 home/nix/default.nix

diff --git a/home/default.nix b/home/default.nix
index 82d2cc3..3e34ddb 100644
--- a/home/default.nix
+++ b/home/default.nix
@@ -19,6 +19,7 @@
     ./jq
     ./mail
     ./mpv
+    ./nix
     ./nix-index
     ./nm-applet
     ./packages
diff --git a/home/nix/default.nix b/home/nix/default.nix
new file mode 100644
index 0000000..a846baa
--- /dev/null
+++ b/home/nix/default.nix
@@ -0,0 +1,39 @@
+# Nix related settings
+{ config, inputs, lib, options, pkgs, ... }:
+let
+  cfg = config.my.home.nix;
+in
+{
+  options.my.home.nix = with lib; {
+    enable = my.mkDisableOption "nix configuration";
+
+    addToRegistry = my.mkDisableOption "add inputs and self to registry";
+
+    overrideNixpkgs = my.mkDisableOption "point nixpkgs to pinned system version";
+  };
+
+  config = lib.mkIf cfg.enable (lib.mkMerge [
+    {
+      nix = {
+        package = lib.mkDefault pkgs.nix;
+
+        settings = {
+          experimental-features = [ "nix-command" "flakes" ];
+        };
+      };
+    }
+
+    (lib.mkIf cfg.addToRegistry {
+      nix.registry = {
+        # Allow me to use my custom package using `nix run self#pkg`
+        self.flake = inputs.self;
+        # Use pinned nixpkgs when using `nix run pkgs#<whatever>`
+        pkgs.flake = inputs.nixpkgs;
+        # ... And also with `nix run nixpkgs#<whatever>`
+        nixpkgs.flake = lib.mkIf cfg.overrideNixpkgs inputs.nixpkgs;
+        # Add NUR to run some packages that are only present there
+        nur.flake = inputs.nur;
+      };
+    })
+  ]);
+}