extract of my home-manager configuration

linux.nix

    home = {
    sessionPath = [ "${config.xdg.configHome}/emacs/bin" "${config.home.homeDirectory}/.emacs.d/bin" "${pkgs.emacs}/bin" "${pkgs.git}" ];
    sessionVariables = {
      DOOMDIR = "${config.xdg.configHome}/doom-config";
      DOOMLOCALDIR = "${config.xdg.configHome}/doom-local";
      #DOOMLOCALDIR = "${config.home.homeDirectory}/.emacs.d";
    };
  };
  xdg = {
    enable = true;
    configFile = {
      "doom-config".source = dotfiles/dot-doom.d;
      "emacs" = {
        source = builtins.fetchGit "https://github.com/hlissner/doom-emacs";
        onChange = "${pkgs.writeShellScript "doom-change" ''
          export DOOMDIR="${config.home.sessionVariables.DOOMDIR}"
          export DOOMLOCALDIR="${config.home.sessionVariables.DOOMLOCALDIR}"
          export PATH="$PATH:${pkgs.emacs}/bin"
          export PATH="$PATH:${pkgs.git}/bin"
          export PATH="$PATH:${pkgs.imagemagick}/bin"
          export PATH="$PATH:${pkgs.ripgrep}/bin"
          export PATH="$PATH:${pkgs.fd}/bin"
          export PATH="$PATH:${pkgs.sqlite}/bin"
          if [ ! -d "$DOOMLOCALDIR" ]; then
            ${config.xdg.configHome}/emacs/bin/doom install --force
          else
            ${config.xdg.configHome}/emacs/bin/doom --force clean
            ${config.xdg.configHome}/emacs/bin/doom --force sync -u
          fi
        ''}";
      };
    };
  };