Nix OnlyOffice

OnlyOffice is better than LibreOffice for Microsoft compatibility, and it also has a prettier interface, but there are some issues that need to be resolved before you can get it working smoothly. First, add this repository as an input to your flake:

{
  # ...
  inputs = {
    # ...
    nix-onlyoffice.url = "github:JakeHPark/nix-onlyoffice";
    # ...
  };
  # ...
}

Then apply the overlay:

{ inputs, ... }: {
  # ...
  (
    { ... }:
    {
      nixpkgs.overlays = [
        inputs.nix-onlyoffice.overlays.default
        # ...
      ];
    }
  )

  ./configuration.nix

  inputs.nix-onlyoffice.nixosModules.onlyoffice
  # ...
}

Then in your configuration.nix:

programs.onlyoffice.enable = true;

fonts.packages = with pkgs; [
  # nix-onlyoffice comes with Microsoft fonts like Wingdings.
  # This renders `corefonts` and `vista-fonts` redundant.
  microsoft-fonts
  # ...
];

Without microsoft-fonts, a lot of symbols and text won't display properly. The other default options are:

programs.onlyoffice = {
  # This can be set to `null` to not install any package.
  package = pkgs.onlyoffice-desktopeditors;

  # Whether to set OnlyOffice as the default application for supported office document MIME types.
  defaultApplications = true;

  gstreamer = {
    # Whether to install GStreamer plugins and expose `GST_PLUGIN_SYSTEM_PATH_1_0`.
    enable = true;

    plugins = with pkgs.gst_all_1; [
      gstreamer
      gst-plugins-base
      gst-plugins-good
      gst-plugins-bad
      gst-plugins-ugly
      gst-libav
      gst-vaapi
    ];
  };

  copyFonts = {
    # Whether to copy configured fonts into `~/.local/share/fonts`.
    enable = true;

    # The font packages to copy. If `null`, it refers to `config.fonts.packages`.
    fontPackages = null;

    # Where to copy the font packages to.
    relativeTargetDir = ".local/share/fonts/nix-onlyoffice";
  };
};

In particular, the GStreamer plugins are necessary for integrated video playing, and the font copying is necessary for OnlyOffice to recognise them at all.

If you have Nix Home Utils, you can also conveniently set:

{
  nix-home-utils.onlyOffice.settings = {
    # For example:
    General.UITheme = "theme-night";
    General.maximized = true;
    General.savePath = "${config.home.homeDirectory}/Desktop";
  };
}