add flake-haskell

flake.nix

@@ -12,6 +12,10 @@
         path = ./flakes/rust;
         description = "Flake to develop, build and run a rust application";
       };
+      flake-haskell = {
+        path = ./flakes/haskell;
+        description = "Flake to develop haskell application";
+      };
       flake-jupyter = {
         path = ./flakes/jupyter;
         description = "Flake to configure jupyter lab";

flakes/haskell/.envrc

@@ -0,0 +1 @@
+use flake

flakes/haskell/flake.nix

@@ -0,0 +1,48 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, utils }:
+    utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = import nixpkgs { inherit system; };
+        hPkgs = pkgs.haskellPackages;
+
+        stack-wrapped = pkgs.symlinkJoin {
+          name = "stack";
+          paths = [ pkgs.stack ];
+          buildInputs = [ pkgs.makeWrapper ];
+          postBuild = ''
+            wrapProgram $out/bin/stack \
+              --add-flags "\
+                --nix \
+                --no-nix-pure \
+                --no-install-ghc \
+                --system-ghc \
+              "
+          '';
+        };
+
+        myDevTools = with hPkgs; [
+          ghc
+          ghcid
+          ormolu
+          hlint
+          hoogle
+          haskell-language-server
+          implicit-hie
+          retrie
+          stack-wrapped
+          pkgs.zlib
+        ];
+      in
+      {
+        devShells.default = pkgs.mkShell {
+          buildInputs = myDevTools;
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath myDevTools;
+        };
+      });
+}