class Intercal < Formula
  desc "Esoteric, parody programming language"
  homepage "http://catb.org/~esr/intercal/"
  url "http://catb.org/~esr/intercal/intercal-0.31.tar.gz"
  sha256 "93d842b81ecdc82b352beb463fbf688749b0c04445388a999667e1958bba4ffc"
  license "GPL-2.0"

  # The latest version tags in the Git repository are `0.31` (2019-06-12) and
  # `0.30` (2015-04-02) but there are older versions like `1.27` (2010-08-25)
  # and `1.26` (2010-08-25). These two older 1.x releases are wrongly treated
  # as newer but the GitLab project doesn't do releases, so we can only
  # reference the tags. We work around this by restricting matching to 0.x
  # releases for now. If the major version reaches 1.x in the future, this
  # check will also need to be updated.
  livecheck do
    url :head
    regex(/^v?(0(?:\.\d+)+)$/i)
  end

  bottle do
    sha256 ventura:      "996598c6c8145f0a45dac7109aa3cb39b5854396b58c3b7ab75c784844160877"
    sha256 monterey:     "a691470666ee0f15af22265be65eda2757fabd8f6fbc5fa8341f8c3059749d34"
    sha256 big_sur:      "487fc70071a54c09cccdbba0284db23c156983b76416a4b4c03f44130531213c"
    sha256 catalina:     "a2c1673fbed3d331e725694196acf9ea4cd6bc6df3b86568af3e67ee90d70b30"
    sha256 mojave:       "d048d5c58fd1fc3b17c44103b3bbddd445a657415c215916587d9eb8e7f9c2da"
    sha256 high_sierra:  "c0569e08915adc912bdc3fb149d0d3c50e7a2d941fff8b2d951b22fcfaf4539f"
    sha256 sierra:       "b00c959878aaead39f9106ef199d7082b4e1a62ef6957f11796a99650678c9b2"
    sha256 x86_64_linux: "31105eaa4a4800c562060caa8fa7c241b946c8dca2e92f0b2e101c34830787e8"
  end

  head do
    url "https://gitlab.com/esr/intercal.git", branch: "master"

    depends_on "autoconf" => :build
    depends_on "automake" => :build
  end

  uses_from_macos "bison" => :build
  uses_from_macos "flex" => :build

  def install
    if build.head?
      cd "buildaux" do
        system "./regenerate-build-system.sh"
      end
    end
    system "./configure", "--disable-dependency-tracking",
                          "--prefix=#{prefix}"
    system "make", "install"
    (etc/"intercal").install Dir["etc/*"]
    pkgshare.install "pit"
  end

  test do
    (testpath/"lib").mkpath
    (testpath/"test").mkpath
    cp pkgshare/"pit/beer.i", "test"
    cd "test" do
      system bin/"ick", "beer.i"
      system "./beer"
    end
  end
end