refactor(flake): discover project packages

src/flake/packages.nix

@@ -6,13 +6,33 @@
 }:
 let
   pkgs = inputs.nixpkgs.legacyPackages.${system};
-in
-{
-  xatu = import ../xatu/package.nix {
-    inherit
-      lib
-      pkgs
-      root
-      ;
+
+  packageDirs =
+    dir:
+    lib.flatten (
+      lib.mapAttrsToList (
+        name: type:
+        let
+          path = dir + "/${name}";
+        in
+        if type == "directory" then
+          packageDirs path
+        else if type == "regular" && name == "package.nix" then
+          [ dir ]
+        else
+          [ ]
+      ) (builtins.readDir dir)
+    );
+
+  package = dir: {
+    name = builtins.baseNameOf (toString dir);
+    value = import (dir + "/package.nix") {
+      inherit
+        lib
+        pkgs
+        root
+        ;
+    };
   };
-}
+in
+builtins.listToAttrs (map package (packageDirs (root + "/src")))