add module arg pkgs

This change adds a `pkgs` arguments to the module args.

Accessing packages from nixpkgs becomes easier as the user is not forced to go through `config.deps` anymore.

`config.deps` can still be used to override packages from `pkgs`.

lib/default.nix

@@ -67,8 +67,8 @@
             ];
           specialArgs =
             specialArgs
+            // {inherit packageSets;}
             // {
-              inherit packageSets;
               dream2nix.modules.dream2nix = dream2nix.modules.dream2nix;
               dream2nix.overrides = dream2nix.overrides;
               dream2nix.lib.evalModules = evalModules;

modules/dream2nix/WIP-haskell-cabal/default.nix

@@ -2,7 +2,6 @@
   lib,
   dream2nix,
   config,
-  packageSets,
   ...
 }: let
   cfg = config.haskell-cabal;

modules/dream2nix/WIP-spago/default.nix

@@ -2,7 +2,6 @@
   lib,
   dream2nix,
   config,
-  packageSets,
   ...
 }: let
   l = lib // builtins;

modules/dream2nix/core/deps/default.nix

@@ -22,8 +22,6 @@ in {
         So deps should be specific, but not overly specific. For instance, the caller shouldn't have to know the version of a dependency in order to override it. The name should suffice. (e.g. `nix = nixVersions.nix_2_12` instead of `inherit (nixVersions) nix_2_12`.
       '';
       type = t.submoduleWith {
-        # TODO: This could be made stricter by removing the freeformType
-        # Maybe add option `strictDeps = true/false` ? ;P
         modules = [{freeformType = t.lazyAttrsOf t.raw;}];
         specialArgs = packageSets;
       };
@@ -36,4 +34,11 @@ in {
       default = {};
     };
   };
+  config._module.args.pkgs =
+    config.deps
+    // lib.optionalAttrs (packageSets ? nixpkgs) (
+      builtins.mapAttrs
+      (name: pkg: config.deps.${name} or pkg)
+      packageSets.nixpkgs
+    );
 }

modules/dream2nix/core/env/default.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  packageSets,
   ...
 }: let
   l = lib // builtins;

modules/dream2nix/core/public/interface.nix

@@ -1,7 +1,6 @@
 {
   config,
   lib,
-  packageSets,
   ...
 }: let
   l = lib // builtins;

modules/dream2nix/nodejs-granular-v3/interface.nix

@@ -2,7 +2,6 @@
   config,
   lib,
   dream2nix,
-  packageSets,
   specialArgs,
   ...
 }: let

modules/dream2nix/php-granular/interface.nix

@@ -2,7 +2,6 @@
   config,
   dream2nix,
   lib,
-  packageSets,
   specialArgs,
   ...
 }: let

tests/nix-unit/nixpkgs/default.nix

@@ -0,0 +1,50 @@
+{
+  pkgs ? import <nixpkgs> {},
+  lib ? import <nixpkgs/lib>,
+  inputs ? {},
+  dream2nix ? import ../../.. inputs,
+}: let
+  eval = module:
+    (lib.evalModules {
+      modules = [
+        dream2nix.modules.dream2nix.WIP-groups
+        module
+      ];
+      specialArgs = {
+        inherit dream2nix;
+        packageSets.nixpkgs = pkgs;
+      };
+    })
+    .config;
+in {
+  test_old = let
+    config = eval (
+      {pkgs, ...}: {
+        imports = [
+          dream2nix.modules.dream2nix.mkDerivation-mixin
+          dream2nix.modules.dream2nix.deps
+        ];
+        deps = {nixpkgs, ...}: {
+          foo = nixpkgs.hello.overrideAttrs (old: {
+            pname = "foo";
+          });
+        };
+        name = "test";
+        version = "0.0.0";
+        phases = ["buildPhase"];
+        buildPhase = ''
+          # explicit package
+          echo ${pkgs.foo} >> $out
+          # implicit package
+          echo ${pkgs.hello} >> $out
+        '';
+      }
+    );
+  in {
+    expr = builtins.readFile config.public;
+    expected = ''
+      ${config.deps.foo}
+      ${pkgs.hello}
+    '';
+  };
+}