Split up shell.nix and default.nix

default.nix

@@ -4,33 +4,15 @@ with pkgs;
 with luaPackages;
 
 let
-  buildArgs = { inherit buildLuarocksPackage fetchurl lua; };
-  deps = builtins.mapAttrs (dep: path: import path buildArgs) {
-    moonscript = ./nix/moonscript.nix;
-    luacov = ./nix/luacov.nix;
-    luacov-coveralls = ./nix/luacov-coveralls.nix;
-    lanes = ./nix/lanes.nix;
-  };
-  ffi = if isLuaJIT then [] else [ luaffi ];
-  runTimeDeps = [ lua argparse luafilesystem ];
-  testDeps = with deps; ffi ++ [
-    lanes
-    moonscript
-    busted
-    luacheck
-    luacov
-    luacov-coveralls
-  ];
+  pkgInfo = import ./nix/lua-quickcheck.nix { inherit lua pkgs; };
 in
-  {
-    lua-quickcheck = stdenv.mkDerivation rec {
-      name = "lua-quickcheck";
-      env = buildEnv { name = name; paths = buildInputs; };
-      buildInputs = runTimeDeps;
-      src = ./.;
-    };
-    shell = mkShell {
-      inputsFrom = testDeps;
-      buildInputs = runTimeDeps;
+  with pkgInfo;
+  stdenv.mkDerivation {
+    inherit name;
+    buildInputs = buildDeps;
+    src = ./.;
+    env = buildEnv {
+      inherit name;
+      paths = buildDeps;
     };
   }

nix/lua-quickcheck.nix

@@ -0,0 +1,28 @@
+{ lua, pkgs }:
+
+with pkgs;
+with luaPackages;
+
+let
+  buildArgs = { inherit buildLuarocksPackage fetchurl lua; };
+  deps = builtins.mapAttrs (dep: path: import path buildArgs) {
+    moonscript = ./moonscript.nix;
+    luacov = ./luacov.nix;
+    luacov-coveralls = ./luacov-coveralls.nix;
+    lanes = ./lanes.nix;
+  };
+  ffi = if isLuaJIT then [] else [ luaffi ];
+  buildDeps = [ luarocks lua argparse luafilesystem ];
+  testDeps = with deps; ffi ++ [
+    lanes
+    moonscript
+    busted
+    luacheck
+    luacov
+    luacov-coveralls
+  ];
+in
+  {
+    name = "lua-quickcheck";
+    inherit buildDeps testDeps;
+  }

shell.nix

@@ -1,3 +1,12 @@
 { luaVersion ? "luajit_2_1", pkgs ? import ./nix/packages.nix {} }:
 
-(import ./. { inherit luaVersion pkgs; }).shell
+with pkgs;
+with luaPackages;
+
+let
+  pkgInfo = import ./nix/lua-quickcheck.nix { inherit lua pkgs; };
+in
+  with pkgInfo; mkShell {
+    buildInputs = buildDeps;
+    inputsFrom = testDeps;
+  }