cabal-test-nix-shell.cabal

cabal-version:       >=1.10
name:                cabal-test-nix-shell
version:             0.1.0.0
author:              Rodney Lorrimar
maintainer:          dev@rodney.id.au
build-type:          Simple

executable cabal-test-nix-shell
  main-is:             Main.hs
  build-depends:       base >=4.12 && <4.15
                     , bytestring
                     , zlib
  default-language:    Haskell2010

Main.hs

{-# LANGUAGE OverloadedStrings #-}

module Main where

import Codec.Compression.GZip
import qualified Data.ByteString.Lazy.Char8 as L8

main :: IO ()
main = L8.putStrLn $ decompress "\US\139\b\NUL\NUL\NUL\NUL\NUL\NUL\ETX\243H\205\201\201\215Q\240H,\206\ACK\178\DC4\SOH\204\178\139\v\SI\NUL\NUL\NUL"

Setup.hs

import Distribution.Simple
main = defaultMain

shell.nix

{ pkgs ? import <nixpkgs> {} }:

let
  ghc = pkgs.haskell.compiler.ghc865;
  # ghc = haskell.compiler.ghc8102;  # becomes warning: [-Wmissed-extra-shared-lib]
in
  pkgs.mkShell {
    buildInputs = with pkgs; [
      cabal-install 
      ghc
      pkgconfig
      zlib.dev
    ];
    shellHook = ''
      eval $(egrep ^export ${ghc}/bin/ghc)
    '';
  }