1 files changed, 68 insertions, 14 deletions
diff --git a/default.nix b/default.nix
index 875f0d5b4..c6a635c29 100644
--- a/default.nix
+++ b/default.nix
@@ -1,26 +1,80 @@
-{ user-name, system-name }:
+{ current-date
+, current-host-name
+, current-user-name
+}:
 
 let
+  lib = import <nixpkgs/lib>;
 
-  eval = import <nixpkgs/nixos/lib/eval-config.nix> {
+  krebs-modules-path = ./krebs/3modules;
+  krebs-pkgs-path = ./krebs/5pkgs;
+  user-modules-path = ./. + "/${current-user-name}/3modules";
+  user-pkgs-path = ./. + "/${current-user-name}/5pkgs";
+
+  out =
+    lib.mapAttrs (_: builtins.getAttr "main")
+      (lib.filterAttrs (_: builtins.hasAttr "main")
+        (lib.mapAttrs
+          (k: v:
+            if lib.hasPrefix "." k || v != "directory" then
+              {}
+            else if builtins.pathExists (./. + "/${k}/default.nix") then
+              { main = import (./. + "/${k}"); }
+            else if builtins.pathExists (./. + "/${k}/1systems") then
+              { main = mk-namespace (./. + "/${k}"); }
+            else
+              {})
+          (builtins.readDir ./.)));
+
+  eval = path: import <nixpkgs/nixos/lib/eval-config.nix> {
     system = builtins.currentSystem;
-    modules = map (p: ./. + "/${p}") [
-      "${user-name}/1systems/${system-name}.nix"
-      "${user-name}/3modules"
-      "krebs/3modules"
+    modules = [
+      path
+      krebs-modules-path
+      user-modules-path
     ] ++ [
-      ({ lib, pkgs, ... }: {
+      ({ config, lib, pkgs, ... }@args: {
        _module.args.pkgs =
-         (import ./krebs/5pkgs { inherit lib pkgs; }) //
-         (import (./. + "/${user-name}/5pkgs") { inherit lib pkgs; });
+         (import krebs-pkgs-path args) //
+         (import user-pkgs-path args);
       })
     ];
   };
 
-in
+  mk-namespace = path: mapNixDir mk-system (path + "/1systems");
+
+  mk-system = path: rec {
+    inherit (eval path) config options;
+    system = config.system.build.toplevel;
+    fetch = import ./krebs/0tools/fetch.nix { inherit config lib; };
+  };
+
+  mapNixDir = f: path: lib.mapAttrs (_: f) (nixDir path);
+
+  nixDir = path:
+    builtins.listToAttrs
+      (catMaybes
+        (lib.mapAttrsToList
+          (k: v: {
+            directory =
+              let p = path + "/${k}/default.nix"; in
+              if builtins.pathExists p
+                then Just (lib.nameValuePair k p)
+                else Nothing;
+            regular =
+              let p = path + "/${k}"; in
+              if lib.hasSuffix ".nix" p
+                then Just (lib.nameValuePair (lib.removeSuffix ".nix" k) p)
+                else Nothing;
+          }.${v} or Nothing)
+          (builtins.readDir path)));
 
-{
-  inherit (eval) config options;
+  # TODO move to lib
+  Just = x: { type = "maybe"; value = x; };
+  Nothing = { type = "maybe"; };
+  isMaybe = x: builtins.typeOf x == "set" && x.type or false == "maybe";
+  isJust = x: isMaybe x && builtins.hasAttr "value" x;
+  fromJust = x: assert isJust x; x.value;
+  catMaybes = xs: map fromJust (builtins.filter isJust xs);
 
-  system = eval.config.system.build.toplevel;
-}
+in out