configuration.nix

{ pkgs, ... }:

let
  kioskUsername = "kiosk";
  browser = pkgs.firefox;
  rcfile = ''
    <?xml version="1.0" encoding="UTF-8"?>
    <openbox_config xmlns="http://openbox.org/3.4/rc">
    <applications>
    <application class="*">
    <decor>no</decor>
    </application>
    </applications>
    </openbox_config>
  '';
  autostart = ''
    #!${pkgs.bash}/bin/bash
    # End all lines with '&' to not halt startup script execution
    # https://developer.mozilla.org/en-US/docs/Mozilla/Command_Line_Options
    echo "this will be a great presentation" > pre.txt
    sent pre.txt &
    # firefox --kiosk https://impress.js.org/#/bored &
  '';


  inherit (pkgs) writeScript;
in {
  # Set up kiosk user
  users.users = {
    "${kioskUsername}" = {
      group = kioskUsername;
      isNormalUser = true;
      packages = [ browser ];
      initialPassword = "test";
      extraGroups = [ "video" ];
    };
  };
  users.groups."${kioskUsername}" = { };

  # Configure X11
  services.xserver = {
    enable = true;
    layout = "us"; # keyboard layout
    libinput.enable = true;

    # Let lightdm handle autologin
    displayManager.lightdm = {
      enable = true;
      autoLogin = {
        enable = true;
        timeout = 0;
        user = kioskUsername;
      };
    };

    # Start openbox after autologin
    windowManager.openbox.enable = true;
    displayManager.defaultSession = "none+openbox";
  };

  # Overlay to set custom autostart script for openbox
  nixpkgs.overlays = with pkgs; [
    (self: super: {
      openbox = super.openbox.overrideAttrs (oldAttrs: rec {
        postFixup = ''
          ln -sf /etc/openbox/autostart $out/etc/xdg/openbox/autostart
        '';
      });
    })
  ];

  # By defining the script source outside of the overlay, we don't have to
  # rebuild the package every time we change the startup script.
  # pdfpc pympress jfbpdf xpdf
  environment.etc."openbox/autostart".source = writeScript "autostart" autostart;
  environment.etc."openbox/rc.xml".text = ${rcfile}
  environment.systemPackages = with pkgs; [ sent plymouth pdfpc ];
  boot.plymouth.enable = true;

}