Move to a profile-based configuration where common

This patch makes it so common configuration is now located in shared/
and each host basically just becomes a bunch of import statements.

The exception here is host-specific configuration like the `*.linus.onl`
that live inside `hosts/ahmed/`.

Specifically I have:

- moved common configuration `shared/{nixos,home-manager,nix-darwin}`.
- moved `hosts/common.nix` to `shared/nixos/common-{nix,shell}-settings.nix`.
- split `hosts/muhammed/{dev-utils,neovim}` into per-language
  configuration.

This patch was done in preparation for the arrival of a new host, which
will need to share a lot of configuration with Muhammed.

1 files changed, 27 insertions, 0 deletions

diff --git a/shared/nixos/common-hm-settings/default.nix b/shared/nixos/common-hm-settings/default.nix
new file mode 100644
index 0000000..9262f51
--- /dev/null
+++ b/shared/nixos/common-hm-settings/default.nix
@@ -0,0 +1,27 @@
+# This module sets common settings related to home-manager (HM). All hosts that
+# I directly interact with should include this module.
+#
+# NOTE: Even though this lives under `shared/nixos` the configuration in here
+# should also be compatible with nix-darwin!!
+{
+  flakeInputs,
+  flakeOutputs,
+  metadata,
+  ...
+}: {
+  # FIXME: Ideally this module would import flakeInputs.home-manager but that causes an infinite recursion for some reason.
+
+  # Use the flake input pkgs so Home Manager configuration can share overlays
+  # etc. with the rest of the configuration.
+  home-manager.useGlobalPkgs = true;
+
+  # Pass special arguments from flake.nix further down the chain. I really hate
+  # this split module system.
+  home-manager.extraSpecialArgs = {inherit flakeInputs flakeOutputs metadata;};
+
+  # All interactive systems (i.e. the ones that would use HM) have a 'linus' user.
+  home-manager.users.linus = {
+    imports = builtins.attrValues flakeOutputs.homeModules;
+    xdg.enable = true;
+  };
+}