nixos/cross-seed: add 'useGenConfigDefaults' (#398420)

    types

    ;

  settingsFormat = pkgs.formats.json { };

  generatedConfig =

    pkgs.runCommand "cross-seed-gen-config" { nativeBuildInputs = [ pkgs.cross-seed ]; }

      ''

        export HOME=$(mktemp -d)

        cross-seed gen-config

        mkdir $out

        cp -r $HOME/.cross-seed/config.js $out/

      '';

in

{

  options.services.cross-seed = {

      description = "Cross-seed config directory";

    };

    useGenConfigDefaults = mkOption {

      type = types.bool;

      default = false;

      description = ''

        Whether to use the option defaults from the configuration generated by

        {command}`cross-seed gen-config`.

        Those are the settings recommended by the project, and can be inspected

        from their [template file](https://github.com/cross-seed/cross-seed/blob/master/src/config.template.cjs).

        Settings set in {option}`services.cross-seed.settings` and

        {option}`services.cross-seed.settingsFile` will override the ones from

        this option.

      '';

    };

    settings = mkOption {

      default = { };

      type = types.submodule {

    let

      jsonSettingsFile = settingsFormat.generate "settings.json" cfg.settings;

      genConfigSegment =

        lib.optionalString cfg.useGenConfigDefaults # js

          ''

            const gen_config_js = "${generatedConfig}/config.js";

            Object.assign(loaded_settings, require(gen_config_js));

          '';

      # Since cross-seed uses a javascript config file, we can use node's

      # ability to parse JSON directly to avoid having to do any conversion.

      # This also means we don't need to use any external programs to merge the

            "use strict";

            const fs = require("fs");

            const settings_json = "${jsonSettingsFile}";

            let loaded_settings = JSON.parse(fs.readFileSync(settings_json, "utf8"));

            let loaded_settings = {};

            ${genConfigSegment}

            Object.assign(loaded_settings, JSON.parse(fs.readFileSync(settings_json, "utf8")));

            ${secretSettingsSegment}

            module.exports = loaded_settings;

          '';