init: ui bootstrapping nextjs

pkgs/ui/nix/floco-cfg.nix

@@ -0,0 +1,6 @@
+{
+  imports = [
+    ./pdefs.nix
+    ./foverrides.nix
+  ];
+}

pkgs/ui/nix/foverrides.nix

@@ -0,0 +1,84 @@
+{ lib, config, pkgs, ... }:
+let
+
+  pjs =
+    let
+      msg = "foverrides.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;
+
+  # ---------------------------------------------------------------------------- #
+
+  # example: "13.4.2"
+  nextVersion = builtins.head (builtins.attrNames (lib.filterAttrs (name: _attrs: name == "next") config.floco.pdefs).next);
+
+  # we must change the precompiled swc binary depending on the curerent system.
+  # example: "@next/swc-linux-x64-gnu"
+  swcArch = {
+    "x86_64-linux" = "@next/swc-linux-x64-gnu";
+    "aarch64-linux" = "@next/swc-linux-arm64-gnu";
+
+    "x86_64-darwin" = "@next/swc-darwin-x64";
+    "aarch64-darwin" = "@next/swc-darwin-arm64";
+  }.${config.floco.settings.system};
+
+  # '
+  #           "@next/swc-darwin-arm64": "13.4.12",
+  #         "@next/swc-darwin-x64": "13.4.12",
+
+  #         "@next/swc-linux-arm64-gnu": "13.4.12",
+  #         "@next/swc-linux-arm64-musl": "13.4.12",
+
+  #         "@next/swc-linux-x64-gnu": "13.4.12",
+  #         "@next/swc-linux-x64-musl": "13.4.12",
+
+in
+{
+
+  # ---------------------------------------------------------------------------- #
+
+  config.floco.packages.${ident}.${version} =
+    let
+      cfg = config.floco.packages.${ident}.${version};
+    in
+    {
+
+      # ---------------------------------------------------------------------------- #
+
+      # Removes any `*.nix' files as well as `node_modules/' and
+      # `package-lock.json' from the source tree before using them in builds.
+      source = lib.libfloco.cleanLocalSource ../.;
+
+
+      # nextjs writes in node_mdules
+      built.override.copyTree = true;
+
+      # nextjs chaches some stuff in $HOME
+      built.override.preBuild = ''
+        export HOME=./home
+        ln -s ${pkgs.roboto}/share/fonts ./src/fonts
+      '';
+
+      built.tree =
+        let
+          customOverrides = cfg.trees.dev.overrideAttrs (prev: {
+            treeInfo =
+              prev.treeInfo
+              // {
+                "node_modules/${swcArch}" = {
+                  key = "${swcArch}/${nextVersion}";
+                  link = false;
+                  optional = false;
+                  dev = true;
+                };
+              };
+          });
+        in
+        lib.mkForce customOverrides;
+    };
+}