droid: add support for nix-on-droid platform

Adds support for the nix-on-droid platform. Exposes the
nixOnDroidModules.stylix module. Uses a temporary workaround for
nix-community/nix-on-droid#436.

flake.nix

@@ -231,5 +231,17 @@
             })
           ];
         };
+
+      nixOnDroidModules.stylix =
+        { pkgs, ... }@args:
+        {
+          imports = [
+            (import ./stylix/droid inputs {
+              inherit (self.packages.${pkgs.system}) palette-generator;
+              base16 = base16.lib args;
+              homeManagerModule = self.homeManagerModules.stylix;
+            })
+          ];
+        };
     };
 }

stylix/droid/default.nix

@@ -0,0 +1,27 @@
+inputs:
+{
+  palette-generator,
+  base16,
+  homeManagerModule,
+}:
+{ lib, ... }:
+
+let
+  autoload = import ../autoload.nix { inherit lib inputs; } "droid";
+in
+{
+  imports = [
+    ../pixel.nix
+    ../target.nix
+    ../opacity.nix
+    ./fonts.nix
+    (import ./palette.nix { inherit palette-generator base16; })
+    (import ../templates.nix inputs)
+    (import ../home-manager-integration.nix homeManagerModule)
+  ] ++ autoload;
+
+  # See https://github.com/nix-community/nix-on-droid/issues/436
+  options.lib = lib.mkOption {
+    type = with lib.types; attrsOf attrs;
+  };
+}

stylix/droid/fonts.nix

@@ -0,0 +1,5 @@
+{
+  imports = [ ../fonts.nix ];
+
+  # TODO: set terminal.font to the path of the monospace font
+}

stylix/droid/palette.nix

@@ -0,0 +1,10 @@
+args:
+{ config, lib, ... }:
+
+{
+  imports = [ (import ../palette.nix args) ];
+
+  config = lib.mkIf config.stylix.enable {
+    environment.etc = config.stylix.generated.fileTree;
+  };
+}