require "language/haskell"

class HaskellStack < Formula
  include Language::Haskell::Cabal

  desc "The Haskell Tool Stack"
  homepage "https://haskellstack.org/"
  url "https://github.com/commercialhaskell/stack/releases/download/v1.9.1/stack-1.9.1-sdist-1.tar.gz"
  version "1.9.1"
  sha256 "2628d0a02cb9d48a41f7b257d2619c8ba2e333cd91df03d0729029da53cf6855"
  head "https://github.com/commercialhaskell/stack.git"

  bottle do
    cellar :any_skip_relocation
    sha256 "34c031765ecec6ef8a2bf33e5d5ed4c1cf7b9d46b90d07f0c09c2bc386fa4ade" => :mojave
    sha256 "768f405bca7def215fc50994738f8b70315f005a309024880e31f6a211bd8b91" => :high_sierra
    sha256 "fc57b700e4954373a0f6a2f4eeca7fb566ad7c7594718d90d80a3ce4683c917b" => :sierra
  end

  depends_on "cabal-install" => :build
  depends_on "ghc" => :build

  # Build using a stack config that matches the default Homebrew version of GHC
  resource "stack_lts_12_yaml" do
    url "https://raw.githubusercontent.com/commercialhaskell/stack/v1.9.1/stack-lts-12.yaml"
    version "1.9.1"
    sha256 "331381740e857aac1986b0954ccf09b31e8fec8afd1ab48e394a221c09f2755d"
  end

  def install
    buildpath.install resource("stack_lts_12_yaml")

    cabal_sandbox do
      cabal_install "happy"

      # The flag works around https://github.com/commercialhaskell/stack/issues/4363
      cabal_install "--flags=disable-git-info"

      # Let `stack` handle its own parallelization
      # Prevents "install: mkdir ... ghc-7.10.3/lib: File exists"
      jobs = ENV.make_jobs
      ENV.deparallelize

      system "stack", "-j#{jobs}", "--stack-yaml=stack-lts-12.yaml",
             "--system-ghc", "--no-install-ghc", "setup"
      system "stack", "-j#{jobs}", "--stack-yaml=stack-lts-12.yaml",
             "--system-ghc", "--no-install-ghc", "--local-bin-path=#{bin}",
             "install", "--flag", "stack:disable-git-info"
    end
  end

  test do
    system bin/"stack", "new", "test"
  end
end