moonix/modules/desktop.nix

# ABOUTME: Deploys the Moonarch XDG configs and desktop package set.
# ABOUTME: Counterpart to the package() function in moonarch-git/PKGBUILD.

{ pkgs, lib, moonarchSrc, moonarchPkgs, ... }:

let
  xdg = "${moonarchSrc}/defaults/xdg";
  etc = "${moonarchSrc}/defaults/etc";

  # The moonarch-* helper scripts from defaults/bin, installed as a single
  # package. Counterpart to `install -Dm755 defaults/bin/moonarch-* -t /usr/bin/`.
  # waypaper calls `swww`/`swww-daemon`, but the maintained successor ships as
  # `awww`. Same compatibility symlinks the Arch package creates.
  swww-compat = pkgs.runCommand "swww-compat" { } ''
    mkdir -p "$out/bin"
    ln -s ${pkgs.awww}/bin/awww "$out/bin/swww"
    ln -s ${pkgs.awww}/bin/awww-daemon "$out/bin/swww-daemon"
  '';

  wallpaper = "${moonarchSrc}/defaults/backgrounds/wallpaper.jpg";

  # waypaper's config points at /usr/share/moonarch/wallpaper.jpg, which does
  # not exist here. Generated with the store path instead of copied verbatim.
  waypaperConfig = pkgs.runCommand "waypaper-config.ini" { } ''
    substitute ${xdg}/waypaper/config.ini "$out" \
      --replace-fail /usr/share/moonarch/wallpaper.jpg ${wallpaper}
  '';

  moonarch-scripts = pkgs.stdenv.mkDerivation {
    pname = "moonarch-scripts";
    version = "0-unstable";
    src = moonarchSrc;

    dontBuild = true;
    installPhase = ''
      runHook preInstall
      # moonarch-waybar* are excluded: waybar is not part of this setup, the
      # Quickshell bar replaced it.
      for f in defaults/bin/moonarch-*; do
        case "$(basename "$f")" in
          moonarch-waybar*) continue ;;
        esac
        install -Dm755 "$f" -t "$out/bin/"
      done
      runHook postInstall
    '';

    meta.description = "Moonarch helper scripts for Waybar, power and devices";
  };
in
{
  # --- XDG configs -> /etc/xdg/ ---
  #
  # Deployed verbatim from the moonarch repo; defaults/ stays the single
  # source of truth for both distros.
  #
  # Deliberately excluded: defaults/xdg/walker/ — walker is not part of this
  # setup, the Quickshell launcher replaced it.
  environment.etc = {
    # niri reads /etc/niri, not /etc/xdg/niri. Both are provided: the former
    # is what niri actually loads, the latter keeps the layout consistent with
    # the Arch package and with any user config that includes it.
    "niri/config.kdl".source = "${xdg}/niri/config.kdl";
    "xdg/niri/config.kdl".source = "${xdg}/niri/config.kdl";
    "xdg/quickshell/moonarch".source = "${xdg}/quickshell/moonarch";
    "xdg/foot/foot.ini".source = "${xdg}/foot/foot.ini";
    "xdg/fastfetch/config.jsonc".source = "${xdg}/fastfetch/config.jsonc";
    # defaults/xdg/kanshi/config is an empty placeholder — on Arch too. kanshi
    # rejects it ("failed to parse config file") and restarts in a loop, so it
    # is not deployed. Monitor profiles are machine specific and belong in
    # ~/.config/kanshi/config.
    "xdg/Kvantum/kvantum.kvconfig".source = "${xdg}/Kvantum/kvantum.kvconfig";
    "xdg/qt6ct/qt6ct.conf".source = "${xdg}/qt6ct/qt6ct.conf";
    "xdg/gtk-3.0/settings.ini".source = "${xdg}/gtk-3.0/settings.ini";
    "xdg/gtk-4.0/settings.ini".source = "${xdg}/gtk-4.0/settings.ini";
    "xdg/pipewire/pipewire.conf.d/99-input-denoising.conf".source =
      "${xdg}/pipewire/pipewire.conf.d/99-input-denoising.conf";
    # Kept for layout parity with the Arch package; waypaper itself only reads
    # the copy in the home directory, seeded below.
    "xdg/waypaper/config.ini".source = waypaperConfig;

    # stasis reads /etc/stasis/ as its system-wide fallback, never /etc/xdg/.
    "stasis/stasis.rune".source = "${xdg}/stasis/stasis.rune";

    # moonlock and moonset fall back to /usr/share/moonarch/wallpaper.jpg,
    # which does not exist here, so the wallpaper is pointed at the store path
    # explicitly. Both read these files as their system-wide config.
    "moonlock/moonlock.toml".text = ''
      background_path = "${wallpaper}"
    '';
    "moonset/moonset.toml".text = ''
      background_path = "${wallpaper}"
    '';

    # Configs outside /etc/xdg/ in the Arch package as well.
    "mpv/mpv.conf".source = "${etc}/mpv/mpv.conf";
    "xdg-desktop-portal/niri-portals.conf".source =
      "${etc}/xdg-desktop-portal/niri-portals.conf";
  };

  # Generic-family defaults. Same content as
  # defaults/etc/fonts/conf.d/65-moonarch-fonts.conf, but routed through the
  # fontconfig module: /etc/fonts/conf.d/ is owned by NixOS and rejects
  # environment.etc entries.
  # localConf is written to /etc/fonts/local.conf verbatim, so it has to be a
  # complete XML document — not just the inner elements.
  fonts.fontconfig.localConf = ''
    <?xml version="1.0"?>
    <!DOCTYPE fontconfig SYSTEM "urn:fontconfig:fonts.dtd">
    <fontconfig>
      <description>Moonarch generic-family defaults</description>
      <!-- binding="strong" required: the default weak <prefer> ranks behind
           stock generic fallbacks, so it would not take effect. -->
      <alias binding="strong">
        <family>sans-serif</family>
        <prefer>
          <family>UbuntuSans Nerd Font</family>
        </prefer>
      </alias>
      <alias binding="strong">
        <family>monospace</family>
        <prefer>
          <family>UbuntuSansMono Nerd Font</family>
        </prefer>
      </alias>
    </fontconfig>
  '';

  # --- Compositor ---
  programs.niri.enable = true;

  # niri searches $XDG_CONFIG_HOME/niri/config.kdl, then /etc/niri/config.kdl —
  # not /etc/xdg. On Arch a one-line ~/.config/niri/config.kdl bridges there
  # via `include`; here the system path is used directly, so nothing has to be
  # placed in the home directory.

  # config.kdl spawns the polkit agent by its FHS path
  # (/usr/lib/polkit-gnome/...). Provide that path rather than diverging the
  # config, which is shared with Arch.
  systemd.tmpfiles.rules = [
    "d /usr/lib 0755 root root -"
    "L+ /usr/lib/polkit-gnome - - - - ${pkgs.polkit_gnome}/libexec"
  ];

  # --- Shell ---
  programs.zsh.enable = true;

  # --- Theme, systemwide instead of the gsettings calls in post-install.sh ---
  programs.dconf = {
    enable = true;
    profiles.user.databases = [{
      settings."org/gnome/desktop/interface" = {
        gtk-theme = "Colloid-Grey-Dark-Catppuccin";
        icon-theme = "Colloid-Grey-Catppuccin-Dark";
        color-scheme = "prefer-dark";
        font-name = "UbuntuSans Nerd Font 11";
      };
    }];
  };

  # --- Portals ---
  xdg.portal = {
    enable = true;
    extraPortals = with pkgs; [ xdg-desktop-portal-gnome xdg-desktop-portal-gtk ];
  };

  fonts.packages = with pkgs; [
    nerd-fonts.ubuntu-sans
    openmoji-color
  ];

  environment.systemPackages = with pkgs; [
    # Moonarch's own programs
    moonarchPkgs.moonlock
    moonarchPkgs.moonset
    moonarchPkgs.sweet-cursors
    moonarchPkgs.stasis
    moonarch-scripts

    # Compositor extras
    xwayland-satellite
    kanshi

    # Bar, notifications, clipboard.
    # Neither waybar nor swaync are installed: the Quickshell bar owns both
    # roles. The "kept as a reserve" notes in the Arch config date from the
    # migration and do not apply to a fresh setup.
    quickshell
    libnotify
    cliphist
    wl-clipboard

    # Display and wallpaper
    wlsunset
    nwg-look
    brightnessctl
    awww
    swww-compat
    waypaper

    # Terminal
    foot

    # Audio
    pavucontrol
    alsa-utils

    # Network and bluetooth
    networkmanagerapplet
    blueman

    # File manager stack
    gvfs
    udisks2
    ntfs3g

    # Theming
    (colloid-gtk-theme.override {
      themeVariants = [ "grey" ];
      colorVariants = [ "dark" ];
      tweaks = [ "catppuccin" ];
    })
    (colloid-icon-theme.override {
      schemeVariants = [ "catppuccin" ];
      colorVariants = [ "grey" ];
    })
    libsForQt5.qtstyleplugin-kvantum
    qt6Packages.qtstyleplugin-kvantum
    qt6Packages.qt6ct
    qt6.qt5compat

    # CLI tools referenced by zshrc and the helper scripts
    bat
    btop
    eza
    fastfetch
    fd
    fzf
    jq
    lazygit
    ripgrep
    neovim
    git

    # System
    fwupd
    upower
    polkit_gnome
    wdisplays
    wl-color-picker
  ];

  # Polkit agent for privilege prompts inside the session.
  security.polkit.enable = true;

  # Seed configs for programs that read only from the home directory and have
  # no system-wide fallback. 'C' copies once and never overwrites, so user
  # edits survive. This is what post-install.sh does imperatively on Arch.
  systemd.user.tmpfiles.rules = [
    "C %h/.config/waypaper/config.ini 0644 - - - ${waypaperConfig}"
  ];
}