I3

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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, ... }: 

{
  ...
  environment.pathsToLink = [ "/libexec" ]; # links /libexec from derivations to /run/current-system/sw 
  ...
  services.xserver = {
    enable = true;

    desktopManager = {
      xterm.enable = false;
    };
   
    displayManager = {
        defaultSession = "none+i3";
    };

    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 system by your nix-language-specific changes you have to evaluate it, run (as root):

# nixos-rebuild switch

Using home-manager

~/.config/nixpkg/home.nix

#in configuration.nix
services.xserver = {
  enable = true;
  windowManager.i3.enable = true;
  };
  services.displayManager = {
    defaultSession = "none+i3";
  };

#in home.nix
  xsession.windowManager.i3 = {
    enable = true;
    package = pkgs.i3-gaps;
    config = {
      modifier = "Mod4";
      gaps = {
        inner = 10;
        outer = 5;
      };
    };
  };

See also: srid/nix-config/nix/home/i3.nix

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;

Tips & tricks

i3blocks

After installing and enabling i3blocks, you may notice that i3block won't work. why?

It seems that i3blocks read it's contents from a hardcoded path in /etc by default. Since in nixos, this path look something like:

Path of i3blocks in nixos

  /nix/store/k78nc1bplhy4yjblqwlc14h6rdisix3w-i3blocks-1.4/libexec/i3blocks/[BLOCKS]

And it can't find this path, so we have to create a link to this path by adding this line to configuration.nix file:

/etc/nixos/configuration.nix

  environment.pathsToLink = [ "/libexec" ];

Finally, your block may looks like:

~/.config/i3/i3blocks.conf

[battery]                                                                                                        
label=⚡                                                                                                         
command=/run/current-system/sw/libexec/i3blocks/battery                                                          
interval=10                                                                                                      
instance=1

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;

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.

i3status-rust with home-manager

i3status-rust can be configured through home-manager, but that configuration does not autoamatically update i3 to invoke i3status-rust. Instead xsession.windowManager.i3.config.bars needs to be updated to reference i3status-rust and the config files that the home-manager config produces. Consider the following setup:

~/.config/nixpkg/home.nix

  xsession.windowManager.i3 = {
    enable = true;
    config = {
      bars = [
        {
          position = "top";
          statusCommand = "${pkgs.i3status-rust}/bin/i3status-rs ~/.config/i3status-rust/config-top.toml";
        }
      ];
    };
  };

  programs.i3status-rust = {
    enable = true;
    bars = {
      top = {
        blocks = [
         {
           block = "time";
           interval = 60;
           format = "%a %d/%m %k:%M %p";
         }
       ];
      };
    };
  };
}

i3status with home-manager

Same as in i3status-rust. Notice: home-manager will not override your existing config, i.e. if the file/folder ~/.config/i3status/config is present on your system, there won't be any changes after rebuilding.

External resources that can help you with your setup: https://mynixos.com/home-manager/options/xsession.windowManager.i3.config

To enable i3status in home-manager and change some basic options:

programs.i3status = {

  enable = true;

  general = {
    colors = true;
    color_good = "#98971a";
    color_bad  = "#9d0006";
    interval = 1;
  };
};

Adding various modules:

modules = {

  "disk /" = {
     enable = true;
     position = 1;
     settings = {
       format = "FREE: %free";
     };
  /* Put some of the modules below after this comment */ 

  };

Current wireless connection (ethernet is pretty much the same)

"wireless <replace-with-interface-name>" = {
  enable = true;
  position = 2;
  settings = {
    format_up = "W: (%quality at %essid) %ip";
    format_down = "W: down";
  };
};

Battery status

"battery 0" = {
  enable = true;
  position = 4;
  settings = {
    format = "BAT: %status %percentage %remaining %emptytime";
    format_down = "No battery";
    status_chr = "CHR";
    status_bat = "";
    status_unk = "?";
    status_full = "FULL";
    path = "/sys/class/power_supply/BAT1/uevent";
    low_threshold = 10;
  };
};

Disabling default i3status modules:

After setting up my config, i3status showed two eth- and wifi's. To disable ethernet _first_ and wireless _first_ just add:

"wireless _first_" = {
  enable = false;
};

"ethernet _first_" = {
  enable = false;
};