init: ui bootstrapping nextjs

pkgs/ui/default.nix

@@ -0,0 +1,41 @@
+{ floco ? builtins.getFlake "github:aakropotkin/floco"
+, system ? builtins.currentSystem
+, pkgs ? import <nixpkgs> { currentSystem = system; }
+}:
+let
+
+  lib = floco.lib;
+
+  pjs =
+    let
+      msg = "default.nix: Expected to find `package.json' to lookup " +
+        "package name/version, but no such file exists at: " +
+        (toString ./package.json);
+    in
+    if builtins.pathExists ./package.json then lib.importJSON ./package.json
+    else throw msg;
+  ident = pjs.name;
+  inherit (pjs) version;
+
+
+  fmod = lib.evalModules {
+    modules = [
+      floco.nixosModules.floco
+      { config.floco.settings = { inherit system; basedir = ./.; }; }
+      ./nix/floco-cfg.nix
+    ];
+    specialArgs = {
+      inherit pkgs;
+    };
+  };
+
+  # This attrset holds a few derivations related to our package.
+  # We'll expose these below to the CLI.
+  pkg = fmod.config.floco.packages.${ident}.${version};
+
+
+in
+{
+  inherit pkg fmod;
+}
+