Move let bindings to 'private'

This way I can still inspect and use them from the nix repl by just doing `:l
Biz/Bild.nix`, but its also clear that they aren't part of the normal build
rules.

1 files changed, 33 insertions, 32 deletions

diff --git a/Biz/Bild.nix b/Biz/Bild.nix
index a56ba4d..c007661 100644
--- a/Biz/Bild.nix
+++ b/Biz/Bild.nix
@@ -2,50 +2,51 @@
 
 with import ./Bild/Constants.nix;
 
-let
-  # provided by .envrc
-  root = builtins.getEnv "BIZ_ROOT";
+rec {
+  private = {
+    inherit nixpkgs;
 
-  selectAttrs = deps: packageSet:
-    nixpkgs.lib.attrsets.attrVals deps packageSet;
+    # provided by .envrc
+    root = builtins.getEnv "BIZ_ROOT";
 
-  # returns true if a is a subset of b, where a and b are attrsets
-  subset = a: b: builtins.all
-    (x: builtins.elem x b) a;
+    selectAttrs = deps: packageSet:
+      nixpkgs.lib.attrsets.attrVals deps packageSet;
 
-  # 44 = lib.strings.stringLength "/nix/store/gia2r9mxhc900y1m97dlmr1g3rm3ich3-"
-  dropNixStore = s: nixpkgs.lib.strings.substring 44 (nixpkgs.lib.strings.stringLength s) s;
+    # returns true if a is a subset of b, where a and b are attrsets
+    subset = a: b: builtins.all
+      (x: builtins.elem x b) a;
 
-  haskellDeps = import ./Bild/Deps/Haskell.nix;
+    # 44 = lib.strings.stringLength "/nix/store/gia2r9mxhc900y1m97dlmr1g3rm3ich3-"
+    dropNixStore = s: nixpkgs.lib.strings.substring 44 (nixpkgs.lib.strings.stringLength s) s;
 
-  ghcWith = nixpkgs.haskell.packages.${ghcCompiler}.ghcWithHoogle;
-  #mkGhcjsPackageSet = nixpkgs.haskell.packages.${ghcjsCompiler}.ghcWithPackages;
+    haskellDeps = import ./Bild/Deps/Haskell.nix;
 
-  ghcPackageSetFull = ghcWith haskellDeps;
-  ghcPackageSetBild = ghcWith (hpkgs: with hpkgs; [
-    aeson async base bytestring conduit conduit-extra containers directory
-    docopt filepath process protolude rainbow regex-applicative split tasty
-    tasty-hunit tasty-quickcheck text
-    wai # can remove when removed from Biz.Log
-  ]);
-in rec {
-  inherit (nixpkgs) lib stdenv sources;
+    ghcWith = nixpkgs.haskell.packages.${ghcCompiler}.ghcWithHoogle;
+    #mkGhcjsPackageSet = nixpkgs.haskell.packages.${ghcjsCompiler}.ghcWithPackages;
 
-  inherit ghcWith;
+    ghcPackageSetFull = private.ghcWith private.haskellDeps;
+    ghcPackageSetBild = private.ghcWith (hpkgs: with hpkgs; [
+      aeson async base bytestring conduit conduit-extra containers directory
+      docopt filepath process protolude rainbow regex-applicative split tasty
+      tasty-hunit tasty-quickcheck text
+      wai # can remove when removed from Biz.Log
+    ]);
+  };
+  inherit (nixpkgs) lib stdenv sources;
 
   # a standard nix build for `bild` - this should be the only hand-written
   # builder we need
   bild = stdenv.mkDerivation {
     name = "bild";
     src = ../.;
-    nativeBuildInputs = [ ghcPackageSetBild ];
+    nativeBuildInputs = [ private.ghcPackageSetBild ];
     buildInputs = [ nixpkgs.makeWrapper ];
     strictDeps = true;
     buildPhase = ''
-      mkdir -p $out/bin $out/lib/ghc-${ghcPackageSetFull.version}
+      mkdir -p $out/bin $out/lib/ghc-${private.ghcPackageSetFull.version}
       cp -r \
-        ${ghcPackageSetFull}/lib/ghc-${ghcPackageSetFull.version}/package.conf.d \
-        $out/lib/ghc-${ghcPackageSetFull.version}
+        ${private.ghcPackageSetFull}/lib/ghc-${private.ghcPackageSetFull.version}/package.conf.d \
+        $out/lib/ghc-${private.ghcPackageSetFull.version}
       ghc \
         -Werror \
         -i. \
@@ -55,9 +56,9 @@ in rec {
     '';
     installPhase = ''
       wrapProgram $out/bin/bild \
-        --prefix PATH : ${lib.makeBinPath [ ghcPackageSetBild ]} \
+        --prefix PATH : ${lib.makeBinPath [ private.ghcPackageSetBild ]} \
         --set GHC_PACKAGE_PATH \
-        $out/lib/ghc-${ghcPackageSetFull.version}/package.conf.d
+        $out/lib/ghc-${private.ghcPackageSetFull.version}/package.conf.d
     '';
   };
 
@@ -90,12 +91,12 @@ in rec {
   ghc = main:
     let
       data = analyze main;
-      ghc = ghcWith (hp: selectAttrs data.langdeps hp);
+      ghc = private.ghcWith (hp: private.selectAttrs data.langdeps hp);
       module = lib.strings.concatStringsSep "." data.namespace.path;
     in stdenv.mkDerivation {
       name = module;
       src = ../.;
-      nativeBuildInputs = [ ghc ] ++ selectAttrs data.sysdeps nixpkgs.pkgs;
+      nativeBuildInputs = [ ghc ] ++ private.selectAttrs data.sysdeps nixpkgs.pkgs;
       strictDeps = true;
       buildPhase = ''
         set -eux
@@ -115,7 +116,7 @@ in rec {
   #ghcjs = main:
   #  let
   #    data = analyze main;
-  #    ghcjs = mkGhcjsPackageSet (hp: selectAttrs data.deps hp);
+  #    ghcjs = mkGhcjsPackageSet (hp: private.selectAttrs data.deps hp);
   #  in stdenv.mkDerivation {
   #    name = data.module;
   #    src = ../.;