configuration.nix

# Edit this configuration file to define what should be installed on
# your system.  Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).

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

let
  nvidia-offload = pkgs.writeShellScriptBin "nvidia-offload" ''
    export __NV_PRIME_RENDER_OFFLOAD=1
    export __NV_PRIME_RENDER_OFFLOAD_PROVIDER=NVIDIA-G0
    export __GLX_VENDOR_LIBRARY_NAME=nvidia
    export __VK_LAYER_NV_optimus=NVIDIA_only
    exec -a "$0" "$@"
  '';
in
{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # [1]: https://github.com/fooblahblah/nixos/blob/master/configuration.nix
  boot.cleanTmpDir = true;
  boot.initrd.checkJournalingFS = false;
  hardware.enableAllFirmware = true;
  hardware.enableRedistributableFirmware = false;
  powerManagement.enable = true;

  system.autoUpgrade.enable = true;
  boot.kernelPackages = pkgs.linuxPackages_latest;
  boot.extraModulePackages = with config.boot.kernelPackages; [ v4l2loopback ];

  # Bluetooth
  hardware.bluetooth.enable = true;
  services.blueman.enable = true;
  hardware.bluetooth.settings = {
	  General = {
		  Enable = "Source,Sink,Media,Socket";
	  };
  };

  # Use the systemd-boot EFI boot loader.
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
  
  boot.supportedFilesystems = [ "ntfs" ];

  networking.hostName = "lenovo-p14s"; # Define your hostname.

  # Either NetworkManager or wireless service -- not both! (they conflict)
  networking.networkmanager.enable = true;
  #networking.wireless.enable = true;  # Enables wireless support via wpa_supplicant.

  # Set your time zone.
  time.timeZone = "America/New_York";

  # The global useDHCP flag is deprecated, therefore explicitly set to false here.
  # Per-interface useDHCP will be mandatory in the future, so this generated config
  # replicates the default behaviour.
  networking.useDHCP = false;
  networking.interfaces.enp0s31f6.useDHCP = true;
  networking.interfaces.wlp0s20f3.useDHCP = true;

  # Select internationalisation properties.
  i18n.defaultLocale = "en_US.UTF-8";
  console = {
    font = "Lat2-Terminus16";
    keyMap = "us";
  };

  # Login and Desktop Management
  environment.loginShellInit = ''
    if [ "$(tty)" = "/dev/tty1" ] ; then
        # Your environment variables
        export QT_QPA_PLATFORM=wayland
        export MOZ_ENABLE_WAYLAND=1
        export MOZ_WEBRENDER=1
        export XDG_SESSION_TYPE=wayland
        export XDG_CURRENT_DESKTOP=sway
        exec sway --my-next-gpu-wont-be-nvidia
    fi
  '';
  services = {
    xserver = {
      enable = true;

      desktopManager = {
        xterm.enable = false;
      };

      displayManager = {
        defaultSession = "sway"; # gnome"; # "none+i3"; # "xfce";

        autoLogin = {
          #enable = true;
          #user = "artem";
        };

        lightdm = {
          enable = true;
          #autoLogin.timeout = 0;
          #greeter.enable = false; # uncomment if autologin is on
        };
        gdm = {
          enable = false;
          autoLogin.delay = 0;
        };
      };

      windowManager.i3 = {
        enable = false;
        extraPackages = with pkgs; [
          dmenu #application launcher most people use
          i3status # gives you the default i3 status bar
          i3lock #default i3 screen locker
          # i3blocks #if you are planning on using i3blocks over i3status
       ];
      };

      desktopManager.xfce.enable = true;
        
      desktopManager.gnome3 = {
        enable = true;
        extraGSettingsOverrides = ''
      [ org/gnome/desktop/peripherals/mouse ]
      natural-scroll=true
      
      [org.gnome.desktop.peripherals.touchpad]
      tap-to-click=true
      click-method='default'

      [org/gnome/shell]
      disable-user-extensions=false
        '';
      };
    };
  };

  # Wayland with Nvidia drivers is complicated
  #services.xserver.displayManager.gdm.wayland = false; # true didn't make any difference to me
  # services.xserver.displayManager.gdm.nvidiaWayland = true;
  #hardware.nvidia.modesetting.enable = true; # ?
  #hardware.nvidia.nvidiaPersistenced = true; # ?

  # NVIDIA Config
  services.xserver.videoDrivers = [ "nvidia" ];
  # --- or on certain laptops ---
  #services.xserver.videoDrivers = [ "modesetting" "nvidia" ];
  hardware.nvidia.prime = {
    # sync.enable = true;
    offload.enable = true; # -- fancier alternative: enable per app by running:
    # $ nvidia-offload app

    # Bus ID of the NVIDIA GPU. You can find it using lspci, either under 3D or VGA
    nvidiaBusId = "PCI:45:0:0";

    # Bus ID of the Intel GPU. You can find it using lspci, either under 3D or VGA
    intelBusId = "PCI:0:2:0";
  };

  # Configure keymap in X11
  services.xserver.layout = "us,ru";

  # Laptop power button to suspend
  services.logind.extraConfig = "HandlePowerKey=suspend";

  # Enable CUPS to print documents
  services.printing.enable = true;

  # Enable sound
  sound.enable = true;
  hardware.pulseaudio.enable = true;
  hardware.pulseaudio.package = pkgs.pulseaudioFull;
  
  # Hopefully helps to screen-share under Wayland
  services.pipewire.enable = true;
  xdg = {
    portal = {
      enable = true;
      extraPortals = with pkgs; [
        xdg-desktop-portal-wlr
        xdg-desktop-portal-gtk
      ];
      gtkUsePortal = true;
    };
  };
  environment.sessionVariables = {
     MOZ_ENABLE_WAYLAND = "1";
  };

  # Needed by Steam (or so I heard)
  hardware.opengl.driSupport32Bit = true;
  hardware.opengl.extraPackages32 = with pkgs.pkgsi686Linux; [ libva ];
  hardware.pulseaudio.support32Bit = true;

   # Enable touchpad support (enabled by default in most desktopManager).
  services.xserver.libinput = {
    enable = true;
    touchpad = {
      naturalScrolling = false;
      tapping = true;
      middleEmulation = true;
    };
  };

  # Define a user account. Don't forget to set a password with ‘passwd’.
  users.users.artem = {
    isNormalUser = true;
    createHome = true;
    extraGroups = [ "wheel" "docker" "vboxusers" ]; # Enable ‘sudo’ for the user.
  };

  ############
  #
  # Programs
  #

  # Lorri -- didn't work
  # services.lorri.enable = true;
  
  # Nano
  programs.nano.nanorc = ''
    set nowrap
    set softwrap
    set linenumbers
    set tabsize 2
    set tabstospaces
    set autoindent
    include "${pkgs.nano}/share/nano/extra/*"
  '';

  # Neovim
  programs.neovim = {
    enable = true;
    viAlias = true;
    vimAlias = true;
  };
  
  # Sway
  programs.sway = {
    enable = true;
    wrapperFeatures.gtk = true;
    extraPackages = with pkgs; [ 
    	swaylock swayidle xwayland 
	kitty 
	bemenu dmenu-wayland wofi # launchers: which one is bettter?
	waybar
	grim slurp 
	wlsunset
	wl-clipboard
        mako # notification daemon
	wdisplays # monitor manager
	xdg-desktop-portal-wlr # screen sharing engine
    ];
  };

  # Dconf
  programs.dconf.enable = true;

  # GNUPG for SSH keys management
  # Some programs need SUID wrappers, can be configured further or are
  # started in user sessions.
  programs.mtr.enable = true;
  programs.gnupg.agent = {
    enable = true;
    enableSSHSupport = true;
    pinentryFlavor = "curses";
  };


  ############
  #
  # Packages 
  #

  # List packages installed in system profile. To search, run:
  # $ nix search wget
  environment.systemPackages = with pkgs; [

    # Command-Line Tools
    wget mc file patchelf
    silver-searcher
    lshw
    lynx
    openvpn openssl
    parted
    sudo
    xorg.xbacklight
    zip unzip
    zlib
    which
    pciutils
    nvidia-offload
    direnv
    htop
    gnupg
    inetutils
    killall
    aumix # cli sound control
    imagemagick
    # Extra
    fd exa procs tldr
    fish
    starship
    kitty
    

    # Virtualization

    # Gnome Desktop apps
    gnome3.gedit
    gnome3.gnome-terminal
    gnome3.eog
    gnome3.evince
    #gnome3.shotwell
    gnome3.gnome-tweak-tool
    gnome3.dconf-editor
    gnomeExtensions.appindicator
    gnomeExtensions.dash-to-dock
    transmission-gtk

    # Text
    #emacs # -- using Doom Emacs through Home Manager
    emacs-all-the-icons-fonts    
    geany
    texlive.combined.scheme-full
    ott
    libreoffice-fresh
    aspellDicts.en enchant # helps with spell-checking in e.g. gEdit


    # Media & More Desktop
    firefox-wayland brave
    zoom-us
    tdesktop
    
    ffmpeg vlc
    steam
    droidcam

    dropbox dropbox-cli

    # Develpoment    
    binutils gnumake gdb

    docker

    ghc cabal-install
    haskellPackages.hpack ghcid
    haskell-language-server

    coq_8_12
    
    gcc git
    jdk ant maven
    python
    julia

    # *** Experimental ***
    
    # Command-Line
    starship # nicer shell prompt

    # Lighter Desktop apps
    spaceFM # file manager

    # styling for gtk apps
    lxappearance
  ];

  environment.gnome3.excludePackages = with pkgs.gnome3; [
  ];

    ############
  #
  # Fonts 
  #

  fonts.fonts = with pkgs; [
    nerdfonts
    noto-fonts
    noto-fonts-cjk
    noto-fonts-emoji
    liberation_ttf
    fira-code
    fira-code-symbols
    mplus-outline-fonts
    dina-font
    paratype-pt-mono
    paratype-pt-serif
    paratype-pt-sans
    inconsolata
    ubuntu_font_family
    iosevka
    hasklig
    jetbrains-mono
    monoid
    pkgs.emacs-all-the-icons-fonts
  ];

  nixpkgs.config = {
    allowUnfree = true;

    oraclejdk.accept_license = true;
    
    permittedInsecurePackages = [
      "libplist-1.12"
    ];
    
    # chromium.enablePepperFlash = false;

    # firefox.enableAdobeFlash = true;

    packageOverrides = pkgs: rec {
      unstable = import <unstable> {
        # pass the nixpkgs config to the unstable alias
        # to ensure `allowUnfree = true;` is propagated:
        config = config.nixpkgs.config;
      };
    };
  };

  security.sudo.wheelNeedsPassword = false;

  # List services that you want to enable:

  # Enable the OpenSSH daemon.
  # services.openssh.enable = true;

  virtualisation.docker.enable = true;
  #virtualisation.virtualbox.host.enable = true;
  #virtualisation.virtualbox.host.enableExtensionPack = true;
   
  # Open ports in the firewall.
  # networking.firewall.allowedTCPPorts = [ ... ];
  # networking.firewall.allowedUDPPorts = [ ... ];
  # Or disable the firewall altogether.
  networking.firewall.enable = false;

  # This value determines the NixOS release from which the default
  # settings for stateful data, like file locations and database versions
  # on your system were taken. It‘s perfectly fine and recommended to leave
  # this value at the release version of the first install of this system.
  # Before changing this value read the documentation for this option
  # (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
  system.stateVersion = "20.09"; # Did you read the comment?

}

In extraGSettingsOverrides, you have

      [ org/gnome/desktop/peripherals/mouse ]

and

      [org.gnome.desktop.peripherals.touchpad]

and

      [org/gnome/shell]

Which format is correct?

That's a good question! I don't know if this works really: I use only Sway these days, and it has its own mouse config afair (and I don't experience gnome-shells's user extensions ofc). So you would need to experiment...