home-manager/modules/programs/i3status.nix

{
  config,
  lib,
  pkgs,
  ...
}:
let
  inherit (lib)
    literalExpression
    mkDefault
    mkOption
    types
    ;

  cfg = config.programs.i3status;

  enabledModules = lib.filterAttrs (_n: v: v.enable) cfg.modules;

  formatOrder = n: ''order += "${n}"'';

  formatModule =
    n: v:
    let
      formatLine =
        n: v:
        let
          formatValue =
            v:
            if lib.isBool v then
              (if v then "true" else "false")
            else if lib.isString v then
              ''"${v}"''
            else
              toString v;
        in
        "${n} = ${formatValue v}";
    in
    ''
      ${n} {
        ${lib.concatStringsSep "\n  " (lib.mapAttrsToList formatLine v)}
      }
    '';

  settingsType =
    with types;
    attrsOf (oneOf [
      bool
      int
      str
    ]);

  sortAttrNamesByPosition =
    comparator: set:
    let
      pos = n: set."${n}".position;
    in
    lib.sort (a: b: comparator (pos a) (pos b)) (lib.attrNames set);
in
{
  meta.maintainers = [ lib.maintainers.justinlovinger ];

  options.programs.i3status = {
    enable = lib.mkEnableOption "i3status";

    enableDefault = mkOption {
      type = types.bool;
      default = true;
      description = ''
        Whether or not to enable
        the default configuration.
      '';
    };

    general = mkOption {
      type = settingsType;
      default = { };
      description = ''
        Configuration to add to i3status {file}`config`
        `general` section.
        See
        {manpage}`i3status(1)`
        for options.
      '';
      example = literalExpression ''
        {
          colors = true;
          color_good = "#e0e0e0";
          color_degraded = "#d7ae00";
          color_bad = "#f69d6a";
          interval = 1;
        }
      '';
    };

    modules = mkOption {
      type = types.attrsOf (
        types.submodule {
          options = {
            enable = mkOption {
              type = types.bool;
              default = true;
              description = ''
                Whether or not to enable this module.
              '';
            };
            position = mkOption {
              type = with types; either int float;
              description = ''
                Position of this module in i3status `order`.
              '';
            };
            settings = mkOption {
              type = settingsType;
              default = { };
              description = ''
                Configuration to add to this i3status module.
                See
                {manpage}`i3status(1)`
                for options.
              '';
              example = {
                format = "♪ %volume";
                format_muted = "♪ muted (%volume)";
                device = "pulse:1";
              };
            };
          };
        }
      );
      default = { };
      description = ''
        Modules to add to i3status {file}`config` file.
        See
        {manpage}`i3status(1)`
        for options.
      '';
      example = {
        "volume master" = {
          position = 1;
          settings = {
            format = "♪ %volume";
            format_muted = "♪ muted (%volume)";
            device = "pulse:1";
          };
        };
        "disk /" = {
          position = 2;
          settings = {
            format = "/ %avail";
          };
        };
      };
    };

    package = lib.mkPackageOption pkgs "i3status" { nullable = true; };
  };

  config = lib.mkIf cfg.enable {
    programs.i3status = lib.mkIf cfg.enableDefault {
      general = {
        colors = mkDefault true;
        interval = mkDefault 5;
      };

      modules = {
        ipv6 = {
          position = mkDefault 1;
        };

        "wireless _first_" = {
          position = mkDefault 2;
          settings = {
            format_up = mkDefault "W: (%quality at %essid) %ip";
            format_down = mkDefault "W: down";
          };
        };

        "ethernet _first_" = {
          position = mkDefault 3;
          settings = {
            format_up = mkDefault "E: %ip (%speed)";
            format_down = mkDefault "E: down";
          };
        };

        "battery all" = {
          position = mkDefault 4;
          settings = {
            format = mkDefault "%status %percentage %remaining";
          };
        };

        "disk /" = {
          position = mkDefault 5;
          settings = {
            format = mkDefault "%avail";
          };
        };

        load = {
          position = mkDefault 6;
          settings = {
            format = mkDefault "%1min";
          };
        };

        memory = {
          position = mkDefault 7;
          settings = {
            format = mkDefault "%used | %available";
            threshold_degraded = mkDefault "1G";
            format_degraded = mkDefault "MEMORY < %available";
          };
        };

        "tztime local" = {
          position = mkDefault 8;
          settings = {
            format = mkDefault "%Y-%m-%d %H:%M:%S";
          };
        };
      };
    };

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

    xdg.configFile."i3status/config".text = lib.concatStringsSep "\n" (
      lib.optional (cfg.general != { }) (formatModule "general" cfg.general)
      ++ map formatOrder (sortAttrNamesByPosition lib.lessThan enabledModules)
      ++ lib.mapAttrsToList formatModule (lib.mapAttrs (_n: v: v.settings) enabledModules)
    );
  };
}