dhall: passthru dhall prelude

Makes it possible to reference `dhall.prelude`, the same version that comes with
the dhall exetutable’s source code.

1 files changed, 18 insertions, 0 deletions

diff --git a/pkgs/development/interpreters/dhall/default.nix b/pkgs/development/interpreters/dhall/default.nix
new file mode 100644
index 00000000000..8e1df36e412
--- /dev/null
+++ b/pkgs/development/interpreters/dhall/default.nix
@@ -0,0 +1,18 @@
+{ haskell, haskellPackages, stdenvNoCC }:
+
+let
+  static = haskell.lib.justStaticExecutables haskellPackages.dhall;
+
+in static.overrideAttrs (old: {
+  passthru = old.passthru or {} // {
+    prelude = stdenvNoCC.mkDerivation {
+      name = "dhall-prelude";
+      inherit (old) src;
+      phases = [ "unpackPhase" "installPhase" ];
+      installPhase = ''
+        mkdir $out
+        cp -r Prelude/* $out/
+      '';
+    };
+  };
+})