nixfiles/system/modules/common-nixos.nix

# Options shared by every NixOS host (laptops and the WSL box). Imported via
# baseModules in flake.nix. Host- and platform-specific settings stay in the
# per-machine configs; laptop-only settings live in ./laptop.nix.
{ pkgs, ... }:
{
  time.timeZone = "Europe/London";
  i18n.defaultLocale = "en_GB.UTF-8";

  # Store hygiene. auto-optimise-store hard-links identical files in the store
  # after each build (cheap dedupe; NOT a garbage collector -- there is
  # deliberately no automatic GC timer). The larger download buffer avoids
  # "buffer full" stalls when fetching big NARs over a fast link.
  nix.settings.auto-optimise-store = true;
  nix.settings.download-buffer-size = 134217728; # 128 MiB

  # Minimal system-level CLI available before the home-manager profile loads
  # (e.g. early boot / rescue). User-level tooling lives in home-manager.
  environment.systemPackages = with pkgs; [
    git
    fastfetch
  ];

  # Terminal font with powerline/Nerd glyphs. Installed on every host because
  # the tmux statusline (which uses these glyphs) runs everywhere, not just on
  # the Sway/graphical hosts. foot names it explicitly (home/sway.nix); the Mac
  # installs it via the Darwin config.
  fonts.packages = [ pkgs.nerd-fonts.jetbrains-mono ];
}