add devShell for haskell

README.md

@@ -14,3 +14,8 @@ This repo contains a bunch of handy dev shells that can used on any system that
  - can be activated with `nix develop github:adtya/devshell#python`
  - can also be activated with direnv by adding `use flake github:adtya/devshell#python` to `.envrc`
  - additionally, adding `layout pipenv` to `.envrc` will also activate the pipenv shell based on Pipfile and Pipfile.lock
+
+### Haskell
+ - makes `ghc`, `haskell-language-server`, `cabal` and `stack` available in path
+ - can be activated with `nix develop github:adtya/devshell#haskell`
+ - can also be activated with direnv by adding `use flake github:adtya/devshell#haskell` to `.envrc`

flake.nix

@@ -16,6 +16,7 @@
       devShells = {
         go = import ./go.nix { inherit pkgs; };
         python = import ./python.nix { inherit pkgs; };
+        haskell = import ./haskell.nix { inherit pkgs; };
       };
     }
   );

haskell.nix

@@ -0,0 +1,8 @@
+{ pkgs }: pkgs.mkShell {
+  packages = with pkgs.haskellPackages; [
+    ghc
+    haskell-language-server
+    cabal-install
+    stack
+  ];
+}