home-manager/modules/programs/aria2.nix

{ config, lib, pkgs, ... }:
let
  cfg = config.programs.aria2;

  formatLine = n: v:
    let
      formatValue = v:
        if builtins.isBool v then
          (if v then "true" else "false")
        else
          toString v;
    in "${n}=${formatValue v}";
in {
  meta.maintainers = [ lib.hm.maintainers.justinlovinger ];

  options.programs.aria2 = {
    enable = lib.mkEnableOption "aria2";

    package = lib.mkPackageOption pkgs "aria2" { nullable = true; };

    settings = lib.mkOption {
      type = with lib.types; attrsOf (oneOf [ bool float int str ]);
      default = { };
      description = ''
        Options to add to {file}`aria2.conf` file.
        See
        {manpage}`aria2c(1)`
        for options.
      '';
      example = lib.literalExpression ''
        {
          listen-port = 60000;
          dht-listen-port = 60000;
          seed-ratio = 1.0;
          max-upload-limit = "50K";
          ftp-pasv = true;
        }
      '';
    };

    extraConfig = lib.mkOption {
      type = lib.types.lines;
      default = "";
      description = ''
        Extra lines added to {file}`aria2.conf` file.
      '';
    };
  };

  config = lib.mkIf cfg.enable {
    home.packages = lib.mkIf (cfg.package != null) [ cfg.package ];

    xdg.configFile."aria2/aria2.conf".text = lib.concatStringsSep "\n" ([ ]
      ++ lib.mapAttrsToList formatLine cfg.settings
      ++ lib.optional (cfg.extraConfig != "") cfg.extraConfig);
  };
}