nixos-config/home-manager/modules/emacs/default.nix

{ pkgs
, config
, lib
, ...
}:
with lib; let
  cfg = config.eboskma.programs.emacs;

  tangleEmacsConfig = initFile: pkgs.runCommand "tangled-emacs-${initFile}" { } ''
    cp ${./config.org} ./config.org
    ${cfg.package}/bin/emacs --batch --quick --load org ./config.org --funcall org-babel-tangle
    cp ${initFile} $out
  '';

  emacsWithPackages = pkgs.emacsWithPackagesFromUsePackage {
    config =
      let
        tangledOrgConfig = tangleEmacsConfig "init.el";
      in
      builtins.readFile tangledOrgConfig;

    defaultInitFile = true;
    package = cfg.package;
    alwaysEnsure = true;
    alwaysTangle = true;
    extraEmacsPackages = epkgs: [
      epkgs.emacsql
      epkgs.emacsql-sqlite
    ];
  };

  orgProtocolDesktop = pkgs.makeDesktopItem {
    name = "org-protocol";
    desktopName = "Emacs Org Protocol Handler";
    icon = "emacs";
    categories = [ "Development" "TextEditor" ];
    keywords = [ "org-protocol" ];
    type = "Application";
    exec = "${emacsWithPackages}/bin/emacsclient -- %u";
    terminal = false;
    mimeTypes = [ "x-scheme-handler/org-protocol" ];
    startupWMClass = "Emacs";
  };
in
{
  options.eboskma.programs.emacs = {
    enable = mkEnableOption "activate emacs";

    package = mkPackageOption pkgs "emacs" { };

    daemon = mkOption {
      description = "Whether to enable emacs daemon";
      type = types.bool;
      default = true;
      example = false;
    };
  };

  config = mkIf cfg.enable {
    programs.emacs = {
      enable = true;
      package = emacsWithPackages;
    };

    services.emacs = mkIf cfg.daemon {
      enable = true;
      package = emacsWithPackages;
      client.enable = true;
      socketActivation.enable = true;
    };

    home.file."emacs.d/early-init.el".source = tangleEmacsConfig "early-init.el";

    home.packages = with pkgs; [
      (texlive.combine {
        inherit (texlive) scheme-small wrapfig ulem capt-of;
      })
      orgProtocolDesktop
      nodePackages.bash-language-server
      aspell
      nil
      python3
      lldb
    ] ++
    (with aspellDicts; [ en en-computers en-science fy nl ]) ++
    (lib.optional (versionOlder cfg.package.version "29") (tree-sitter.withPlugins builtins.attrValues));

  };
}