{pkgs, lib, config, ...}: with lib; let inherit (lib) mkOption mkIf optionals literalExample; cfg = config.services.xserver.windowManager.xmonad; xmonad = pkgs.xmonad-with-packages.override { ghcWithPackages = cfg.haskellPackages.ghcWithPackages; packages = self: cfg.extraPackages self ++ optionals cfg.enableContribAndExtras [ self.xmonad-contrib self.xmonad-extras ]; }; xmonadBin = pkgs.writers.writeHaskell "xmonad" { ghc = cfg.haskellPackages.ghc; libraries = [ cfg.haskellPackages.xmonad ] ++ cfg.extraPackages cfg.haskellPackages ++ optionals cfg.enableContribAndExtras (with cfg.haskellPackages; [ xmonad-contrib xmonad-extras ]); } cfg.config; in { options = { services.xserver.windowManager.xmonad = { enable = mkEnableOption "xmonad"; haskellPackages = mkOption { default = pkgs.haskellPackages; defaultText = "pkgs.haskellPackages"; example = literalExample "pkgs.haskell.packages.ghc784"; description = '' haskellPackages used to build Xmonad and other packages. This can be used to change the GHC version used to build Xmonad and the packages listed in extraPackages. ''; }; extraPackages = mkOption { default = self: []; defaultText = "self: []"; example = literalExample '' haskellPackages: [ haskellPackages.xmonad-contrib haskellPackages.monad-logger ] ''; description = '' Extra packages available to ghc when rebuilding Xmonad. The value must be a function which receives the attrset defined in haskellPackages as the sole argument. ''; }; enableContribAndExtras = mkOption { default = false; type = lib.types.bool; description = "Enable xmonad-{contrib,extras} in Xmonad."; }; config = mkOption { default = null; type = with lib.types; nullOr (either path str); description = '' Configuration from which XMonad gets compiled. If no value is specified, the xmonad config from $HOME/.xmonad is taken. If you use xmonad --recompile, $HOME/.xmonad will be taken as the configuration, but on the next restart of display-manager this config will be reapplied. ''; example = '' import XMonad main = launch defaultConfig { modMask = mod4Mask -- Use Super instead of Alt , terminal = "urxvt" } ''; }; }; }; config = mkIf cfg.enable { services.xserver.windowManager = { session = [{ name = "xmonad"; start = if (cfg.config != null) then '' ${xmonadBin} waitPID=$! '' else '' systemd-cat -t xmonad ${xmonad}/bin/xmonad & waitPID=$! ''; }]; }; environment.systemPackages = [ xmonad ]; }; }