@@ -0,0 +1,21 @@+{ pkgs }:
+with builtins;
+let
+  inherit (pkgs) lib;
+in
+rec {
+  importPathStore = p: "${append ../. "/${p}"}";
+
+  mkPathable = s:
+    if
+      s.type == "local"
+    then
+      lib.path.append ../. s.outPath
+    else
+      toString s.outPath
+  ;
+
+  mkNixPath = sources: lib.attrsets.mapAttrsToList
+    (k: v: "${k}=${mkPathable v}")
+    (removeAttrs sources [ "__functor" ]);
+}

@@ -2,26 +2,12 @@ with builtins; 
 let
   sources = import ./nix/sources.nix;
-  sourcesJSON = fromJSON (readFile ./nix/sources.json);
 
   nixpkgs = sources.nixpkgs;
   pkgs = import nixpkgs { };
-  inherit (pkgs.lib) path attrsets;
-
-  mkPathable = v: toString (
-    if
-      path.subpath.isValid v
-    then
-      path.append ./. v
-    else
-      v
-  );
+  lib = import ./lib { inherit pkgs; };
 
-  nixPath = concatStringsSep ":" (
-    attrsets.mapAttrsToList
-      (k: v: "${k}=${mkPathable (getAttr "outPath" v)}")
-      (intersectAttrs sourcesJSON sources)
-  );
+  nixPath = concatStringsSep ":" (lib.mkNixPath sources);
 in
 pkgs.mkShell
 {

@@ -3,6 +3,7 @@ , lib , pkgs
 , ...
 }: {
+  imports = [ ../pin.nix ];
   nix = {
     settings = {
       cores = lib.mkDefault 0;

@@ -0,0 +1,8 @@+{ pkgs, ... }:
+let
+  lib = import ../../lib { inherit pkgs; };
+  sources = import ../../nix/sources.nix;
+in
+{
+  nix.nixPath = lib.mkNixPath sources;
+}