Add unicode-data and unicode-data-names to Nix

nix/haskell-deps.nix

@@ -1,2 +1,4 @@
 haskellPackages: with haskellPackages; [
+  unicode-data
+  unicode-data-names
 ]

nix/pkgs.nix

@@ -1,5 +1,21 @@
 { overlays ? [] }:
 let
   sources = import ./sources.nix;
+  settings = import ./settings.nix;
+
+  overlay = final: prev: {
+    haskell = prev.haskell // {
+      packages = prev.haskell.packages // {
+        "${settings.ghc}" = prev.haskell.packages."${settings.ghc}".override {
+          overrides = haskellOverlay prev;
+        };
+      };
+    };
+  };
+
+  haskellOverlay = pkgs: final: prev: {
+    unicode-data = prev.unicode-data_0_4_0_1;
+    unicode-data-names = pkgs.haskell.lib.markUnbroken prev.unicode-data-names;
+  };
 in
-  import sources.nixpkgs { inherit overlays; }
+  import sources.nixpkgs { overlays = overlays ++ [overlay]; }

nix/settings.nix

@@ -0,0 +1,5 @@
+{
+  # GHC version to use with Nix.
+  # Should match the one in stack.yaml.
+  ghc = "ghc943";
+}

package.yaml

@@ -13,6 +13,7 @@ extra-source-files:
 
 dependencies:
 - base >= 4.7 && < 5
+- unicode-data-names
 
 ghc-options:
 - -Wall

shell.nix

@@ -1,5 +1,8 @@
 { pkgs ? import ./nix/pkgs.nix {} }:
 let
+  haskellDeps = import ./nix/haskell-deps.nix;
+  settings = import ./nix/settings.nix;
+
   tools = with pkgs; [
     # nix tools
     niv
@@ -8,6 +11,7 @@ let
     # haskell tools
     stack
     haskell-language-server
+    (pkgs.haskell.packages."${settings.ghc}".ghcWithPackages haskellDeps)
   ];
 in
   pkgs.mkShellNoCC {

stack-shell.nix

@@ -1,9 +1,10 @@
 {}:
 let
   pkgs = import ./nix/pkgs.nix {};
+  settings = import ./nix/settings.nix;
   haskellDeps = import ./nix/haskell-deps.nix;
 in
   pkgs.haskell.lib.buildStackProject {
     name = "utoy";
-    ghc = pkgs.haskell.packages.ghc943.ghcWithPackages haskellDeps;
+    ghc = pkgs.haskell.packages."${settings.ghc}".ghcWithPackages haskellDeps;
   }

utoy.cabal

@@ -27,6 +27,7 @@ library
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints
   build-depends:
       base >=4.7 && <5
+    , unicode-data-names
   default-language: Haskell2010
 
 executable utoy-exe
@@ -36,6 +37,7 @@ executable utoy-exe
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.7 && <5
+    , unicode-data-names
     , utoy
   default-language: Haskell2010
 
@@ -49,5 +51,6 @@ test-suite utoy-test
   ghc-options: -Wall -Wcompat -Widentities -Wincomplete-record-updates -Wincomplete-uni-patterns -Wmissing-export-lists -Wmissing-home-modules -Wpartial-fields -Wredundant-constraints -threaded -rtsopts -with-rtsopts=-N
   build-depends:
       base >=4.7 && <5
+    , unicode-data-names
     , utoy
   default-language: Haskell2010