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{ config, lib, pkgs, ...}:

with lib;

let

  cfg = config.programs.zathura;

  formatLine = n: v:
    let
      formatValue = v:
        if isBool v then (if v then "true" else "false")
        else toString v;
    in
      "set ${n}\t\"${formatValue v}\"";

in

{
  meta.maintainers = [ maintainers.rprospero ];

  options.programs.zathura = {
    enable = mkEnableOption ''
      Zathura, a highly customizable and functional document viewer
      focused on keyboard interaction'';

    options = mkOption {
      default = {};
      type = with types; attrsOf (either str (either bool int));
      description = ''
        Add <option>:set</option> command options to zathura and make
        them permanent. See
        <citerefentry>
          <refentrytitle>zathurarc</refentrytitle>
          <manvolnum>5</manvolnum>
        </citerefentry>
        for the full list of options.
      '';
      example = { default-bg = "#000000"; default-fg = "#FFFFFF"; };
    };

    extraConfig = mkOption {
      type = types.lines;
      default = "";
      description = ''
        Additional commands for zathura that will be added to the
        <filename>zathurarc</filename> file.
      '';
    };
  };

  config = mkIf cfg.enable {
    home.packages = [ pkgs.zathura ];

    xdg.configFile."zathura/zathurarc".text =
      concatStringsSep "\n" ([]
        ++ optional (cfg.extraConfig != "") cfg.extraConfig
        ++ mapAttrsToList formatLine cfg.options
      ) + "\n";
  };
}