Refactor the whole codebase. Most notable changes:

- No more fail2ban. It didn't work properly
  anyways, I'll need to look into this in the future
- No nix-super. I don't need it and the overlay is
  broken so I'm waiting for that to be fixed first.
- Uses nh instead of nixos-rebuild. This is much
  better.

lib/configuration.nix

@@ -1,37 +0,0 @@
-users: let
-  userHomeConfiguration = users: configuration: {
-    home-manager.users = builtins.foldl' (final: user: final // {
-      ${user} = configuration;
-    }) {} (if builtins.isList users then users else [ users ]);
-  };
-in rec {
-  inherit users;
-
-  isServer  = users.graphical == [];
-  isDesktop = !isServer;
-
-  # For every machine.
-  systemConfiguration = configuration: configuration;
-  systemPackages      = packages: systemConfiguration { environment.systemPackages = packages; };
-  systemFonts         = packages: systemConfiguration { fonts.packages = packages; };
-
-  # For every user, on every machine.
-  homeConfiguration = configuration: { home-manager.sharedModules = [ configuration ]; };
-  homePackages      = packages: homeConfiguration { home.packages = packages; };
-
-  # For every desktop.
-  desktopSystemConfiguration = configuration: if isServer then {} else configuration;
-  desktopSystemPackages      = packages:      if isServer then {} else systemPackages packages;
-  desktopSystemFonts         = packages:      if isServer then {} else systemFonts packages;
-  # For every graphical user on every desktop.
-  desktopHomeConfiguration   = configuration: if isServer then {} else userHomeConfiguration users.graphical configuration;
-  desktopHomePackages        = packages:      if isServer then {} else desktopHomeConfiguration { home.packages = packages; };
-
-  # For every server.
-  serverSystemConfiguration  = configuration: if isServer then configuration else {};
-  serverSystemPackages       = packages:      if isServer then systemPackages packages else {};
-  serverSystemFonts          = packages:      if isServer then systemFonts packages else {};
-  # For every user on every server.
-  serverHomeConfiguration    = configuration: if isServer then homeConfiguration configuration else {};
-  serverHomePackages         = packages:      if isServer then homePackages packages else {};
-}

lib/configuration1.nix

@@ -0,0 +1,6 @@
+lib: {
+  systemConfiguration = cfg: cfg;
+  systemPackages      = pkgs: { environment.systemPackages = pkgs; };
+  systemFonts         = pkgs: { fonts.packages = pkgs; };
+  homeConfiguration   = cfg: { home-manager.sharedModules = [ cfg ]; };
+}

lib/configuration2.nix

@@ -0,0 +1,32 @@
+lib: config: let
+  userHomeConfiguration = users: cfg: {
+    home-manager.users = lib.genAttrs users (_: cfg);
+  };
+
+  allNormalUsers = [ "root" ] ++ lib.pipe config.users.users [
+    (lib.filterAttrs (_: lib.getAttr "isNormalUser"))
+    lib.attrNames
+  ];
+
+  desktopUsers = lib.pipe config.users.users [
+    (lib.filterAttrs (_: lib.getAttr "isDesktopUser"))
+    lib.attrNames
+  ];
+in rec {
+  inherit allNormalUsers desktopUsers;
+
+  isDesktop = desktopUsers != [];
+  isServer  = desktopUsers == [];
+
+  desktopSystemConfiguration   = cfg: lib.optionalAttrs isDesktop cfg;
+  desktopSystemPackages        = pkgs: desktopSystemConfiguration (lib.systemPackages pkgs);
+  desktopSystemFonts           = pkgs: desktopSystemConfiguration (lib.systemFonts pkgs);
+  desktopUserHomeConfiguration = cfg: userHomeConfiguration desktopUsers cfg;
+  desktopUserHomePackages      = pkgs: desktopUserHomeConfiguration { home.packages = pkgs; };
+  desktopHomeConfiguration     = cfg: desktopSystemConfiguration (lib.homeConfiguration cfg);
+  desktopHomePackages          = pkgs: desktopHomeConfiguration { home.packages = pkgs; };
+
+  serverSystemConfiguration = cfg: lib.optionalAttrs isServer cfg;
+  serverSystemPackages      = pkgs: serverSystemConfiguration (lib.systemPackages pkgs);
+  serverHomeConfiguration   = cfg: serverSystemConfiguration (lib.homeConfiguration cfg);
+}

lib/default.nix

@@ -1,6 +0,0 @@
-lib: users: let
-  configuration = import ./configuration.nix users;
-  merge         = import ./merge.nix lib;
-  ssl           = import ./ssl.nix;
-  values        = import ./values.nix;
-in configuration // merge // ssl // values

lib/enabled.nix

@@ -0,0 +1,11 @@
+lib: {
+  enabled = lib.mkMerge [{
+    enable = true;
+  }] // {
+    __functor = self: attributes: self // {
+      contents = self.contents ++ [ attributes ];
+    };
+  };
+
+  disabled = { enable = false; };
+}

lib/merge.nix

@@ -1,13 +1,7 @@
-lib: let
-  mergeAll = builtins.foldl' (collected: module: {
-    imports = collected.imports ++ [ module ];
-  }) { imports = []; };
-in {
-  merge  = a: b: mergeAll [ a b  ];
-  merge3 = a: b: c: mergeAll [ a b c  ];
-  merge4 = a: b: c: d: mergeAll [ a b c d ];
-  merge5 = a: b: c: d: e: mergeAll [ a b c d e ];
-  merge6 = a: b: c: d: e: f: mergeAll [ a b c d e f ];
-
-  recursiveUpdateAll = builtins.foldl' lib.recursiveUpdate {};
+lib: {
+  merge = lib.mkMerge [] // {
+    __functor = self: next: self // {
+      contents = self.contents ++ [ next ];
+    };
+  };
 }

lib/modules.nix

@@ -0,0 +1,10 @@
+lib: {
+  mkConst = value: lib.mkOption {
+    default  = value;
+    readOnly = true;
+  };
+
+  mkValue = value: lib.mkOption {
+    default = value;
+  };
+}

lib/ssl.nix

@@ -1,7 +0,0 @@
-{
-  sslTemplate = domain: {
-    forceSSL    = true;
-    quic        = true;
-    useACMEHost = domain;
-  };
-}

lib/values.nix

@@ -1,18 +1,19 @@
-{
-  enabled = attributes: attributes // {
-    enable = true;
-  };
-
+lib: {
   normalUser = attributes: attributes // {
     isNormalUser = true;
   };
 
+  sudoUser = attributes: attributes // {
+    isNormalUser = true;
+    extraGroups  = [ "wheel" ] ++ attributes.extraGroups or [];
+  };
+
+  desktopUser = attributes: attributes // {
+    isNormalUser  = true;
+    isDesktopUser = true; # Defined in options/desktop.nix.
+  };
+
   systemUser = attributes: attributes // {
     isSystemUser = true;
   };
-
-  graphicalUser = attributes: attributes // {
-    isNormalUser = true;
-    extraGroups  = [ "graphical" ] ++ attributes.extraGroups or []; 
-  };
 }