I3

This article or section needs expansion.

Reason: there are a lot more options (Discuss in Talk:I3#)
Please consult the pedia article metapage for guidelines on contributing.

i3 is a tiling window manager for X.

Enabling

To use i3 set services.xserver.windowManager.i3.enable to true. For example:

/etc/nixos/configuration.nix

{ config, pkgs, callPackage, ... }: {
  ...
  services.xserver = {
    enable = true;

    desktopManager = {
      default = "none";
      xterm.enable = false;
    };

    windowManager.i3 = {
      enable = true;
      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
     ];
    };
  };
  ...
}

Tip

In order to affect your NixOS system by your nix-language-specific changes you must first evaluate it:

$ nixos-rebuild switch --use-remote-sudo

With a desktop manager

i3 is a window manager and does not provide "cosmetic" services like managing multiple monitor configuration or media keys. This is what is usually delegated to a desktop manager. To use xfce as a desktop manager on top of i3, see Xfce#Using_as_a_desktop_manager_and_not_a_window_manager.

I3-gaps fork

To use i3-gaps fork, the following line should be added to the configuration.nix:

services.xserver.windowManager.i3.package = pkgs.i3-gaps;

DConf

If your settings aren't being saved for some applications (gtk3 applications, firefox), like the size of file selection windows, or the size of the save dialog, you will need to enable dconf:

/etc/nixos/configuration.nix

  programs.dconf.enable = true;
  services.dbus.packages = [ pkgs.gnome3.dconf ];

Lxappearance

To change the icon and themes you can install lxappearance:

/etc/nixos/configuration.nix

environment.systemPackages = with pkgs; [
    #---- i3
    lxappearance
    ...
]

Solve inconsistency between gtk2 and gtk3 themes

If enabling dconf or installing Lxappearance but still see inconsistency between themes, you have to manually edit their configurations. In fact, It is possible to install some gtk3 themes but when you start another gtk2 application, your theme not effected properly. It's because there is no .gtkrc-2.0 in your home directory. First create it and paste these lines to it:

~/.gtkrc-2.0

gtk-theme-name="Sierra-compact-light"
gtk-icon-theme-name="ePapirus"
gtk-font-name="Ubuntu 11"
gtk-cursor-theme-name="Deepin"
gtk-cursor-theme-size=0
gtk-toolbar-style=GTK_TOOLBAR_BOTH
gtk-toolbar-icon-size=GTK_ICON_SIZE_LARGE_TOOLBAR
gtk-button-images=1
gtk-menu-images=1
gtk-enable-event-sounds=1
gtk-enable-input-feedback-sounds=1
gtk-xft-antialias=1
gtk-xft-hinting=1
gtk-xft-hintstyle="hintfull"
gtk-xft-rgba="rgb"
gtk-modules="gail:atk-bridge"

Change the options based on your installed themes and icon packs.

Wallpaper

If ~/.background-image exists then it will be displayed as a wallpaper. Options services.xserver.desktopManager.wallpaper.combineScreens and .mode control exactly how it is displayed.