1 files changed, 35 insertions, 0 deletions
diff --git a/users/wpcarro/buildHaskell/default.nix b/users/wpcarro/buildHaskell/default.nix
new file mode 100644
index 000000000000..2f0fd9e1c2d1
--- /dev/null
+++ b/users/wpcarro/buildHaskell/default.nix
@@ -0,0 +1,35 @@
+{ pkgs, ... }:
+
+{
+  # Create a nix-shell for Haskell development.
+  shell = { deps }:
+    let
+      ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
+    in
+    pkgs.mkShell {
+      buildInputs = [ ghc ];
+    };
+
+  # Build a Haskell executable. This assumes a project directory with a
+  # top-level Main.hs.
+  # - `name`: You can find the result at ./result/$name
+  # - `srcs`: Will be passed to `srcs` field of `pkgs.stdenv.mkDerivation`.
+  # - `deps`: A function that accepts `hpkgs` and returns a list of Haskell
+  # - `ghcExtensions`: A list of strings representing the language extensions to
+  #   use.
+  program = { name, srcs, deps, ghcExtensions }:
+    let
+      ghc = pkgs.haskellPackages.ghcWithPackages (hpkgs: deps hpkgs);
+    in
+    pkgs.stdenv.mkDerivation {
+      name = name;
+      buildInputs = [ ];
+      srcs = srcs;
+      buildPhase = ''
+        ${ghc}/bin/ghc -Wall Main.hs ${pkgs.lib.concatMapStrings (x: "-X${x} ") ghcExtensions}
+      '';
+      installPhase = ''
+        mkdir -p $out && mv Main $out/${name}
+      '';
+    };
+}