home-manager/modules/programs/kubecolor.nix

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

with lib;

let

  cfg = config.programs.kubecolor;
  yamlFormat = pkgs.formats.yaml { };
  inherit (pkgs.stdenv.hostPlatform) isDarwin;

in {
  meta.maintainers = with maintainers; [ ajgon ];

  options.programs.kubecolor = {
    enable = mkEnableOption "kubecolor - Colorize your kubectl output";

    package = mkPackageOption pkgs "kubecolor" { };

    enableAlias = mkOption {
      type = types.bool;
      default = false;
      description = ''
        When set to true, it will create an alias for kubectl pointing to
        kubecolor, thus making kubecolor the default kubectl client.
      '';
    };

    settings = mkOption {
      type = yamlFormat.type;
      default = { };
      example = literalExpression ''
        kubectl = lib.getExe pkgs.kubectl
        preset = "dark";
        paging = "auto";
      '';
      description = ''
        Configuration written to {file}`~/.kube/color.yaml` (Linux)
        or {file}`Library/Application Support/kube/color.yaml` (Darwin).
        See <https://kubecolor.github.io/reference/config/> for supported
        values.
      '';
    };
  };

  config = let
    preferXdgDirectories = config.home.preferXdgDirectories
      && (!isDarwin || config.xdg.enable);

    # https://github.com/kubecolor/kubecolor/pull/145
    configPathSuffix = if cfg.package.pname == "kubecolor"
    && lib.strings.toInt (lib.versions.major cfg.package.version) == 0
    && lib.strings.toInt (lib.versions.minor cfg.package.version) < 4 then
      "kube/"
    else
      "kube/color.yaml";

  in mkIf cfg.enable {
    warnings = optional (cfg.package == null && cfg.plugins != [ ]) ''
      You have configured `enableAlias` for `kubecolor` but have not set `package`.

      The alias will not be created.
    '';

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

    home.sessionVariables = if preferXdgDirectories then {
      KUBECOLOR_CONFIG = "${config.xdg.configHome}/${configPathSuffix}";
    } else if isDarwin then {
      KUBECOLOR_CONFIG =
        "${config.home.homeDirectory}/Library/Application Support/${configPathSuffix}";
    } else
      { };

    xdg.configFile = mkIf preferXdgDirectories {
      "kube/color.yaml" = mkIf (cfg.settings != { }) {
        source = yamlFormat.generate "kubecolor-settings" cfg.settings;
      };
    };

    home.file = mkIf (!preferXdgDirectories) {
      "Library/Application Support/kube/color.yaml" =
        mkIf (isDarwin && cfg.settings != { }) {
          source = yamlFormat.generate "kubecolor-settings" cfg.settings;
        };
      ".kube/color.yaml" = mkIf (!isDarwin && cfg.settings != { }) {
        source = yamlFormat.generate "kubecolor-settings" cfg.settings;
      };
    };

    home.shellAliases = lib.mkIf (cfg.enableAlias && (cfg.package != null)) {
      kubectl = lib.getExe cfg.package;
    };
  };
}