#!/usr/bin/env bash
set -Eeuxo pipefail

# Set up niv
niv init
niv update nixpkgs -b nixos-unstable
niv add Infinisil/all-hies

# Create cabal project
export currentdir=${PWD##*/}
cabal init -n -m --is-libandexe --source-dir src --main-is Main.hs -p $currentdir

# Add default.nix
cat << 'EOF' > ./default.nix
let
  compilerVersion = "ghc865";
  sources = import ./nix/sources.nix;
  pkgs = import sources.nixpkgs {};
  hie = (import sources.all-hies {}).versions."${compilerVersion}";
in

with pkgs;

let
  hpkgs = haskell.packages."${compilerVersion}";
  btools = [
    hpkgs.cabal-install
    hpkgs.ghcid
    hpkgs.hoogle
    hpkgs.stylish-cabal
    hie
  ];
  modifier = drv: haskell.lib.addBuildTools drv btools;
in

hpkgs.developPackage { root = ./.; inherit modifier; }
EOF

# Create direnv file
cat << 'EOF' > .envrc
use nix
EOF

direnv allow