Makefile

GHC_VER = ghc864
GHC_ARG = --argstr compiler $(GHC_VER)
IDE_ARG = --arg isIDE true

.PHONY: code
code: bugsy.cabal
	nix-shell \
		$(IDE_ARG) \
		$(GHC_ARG) \
		--run "code ."

nix.nix

# default.nix
{ compiler ? "latest" }:
let
  nixpkgs = import <nixpkgs> {};
  haskell = nixpkgs.pkgs.haskell;
  packages = if compiler == "latest"
             then nixpkgs.pkgs.haskellPackages
             else haskell.packages."${compiler}";
in
  packages.extend (haskell.lib.packageSourceOverrides {
    bugsy = ./..;
  })

# release.nix
{ compiler ? "default" }:
{ compiler ? "latest" }:
let
  packages = import ./default.nix { compiler = compiler; };
in
  { bugsy = packages.bugsy;
  }
  
# shell-WIP.nix
{ compiler ? "latest", isIDE ? false }:
let
  packages = import ./default.nix { compiler = compiler; };
  b = import ./brittany.nix {};
  devPackages = p: if isIDE
                   then [p.hindent p.hlint b.brittany]
                   else [];
in
  packages.shellFor {
    packages = p: [p.bugsy] ++ (devPackages p);
    withHoogle = true;
  }