class Libgit2 < Formula
  desc "C library of Git core methods that is re-entrant and linkable"
  homepage "https://libgit2.github.com/"
  url "https://github.com/libgit2/libgit2/archive/v0.27.3.tar.gz"
  sha256 "50a57bd91f57aa310fb7d5e2a340b3779dc17e67b4e7e66111feac5c2432f1a5"
  head "https://github.com/libgit2/libgit2.git"

  bottle do
    cellar :any
    sha256 "c635ed5de02c318e538f24bf2f29b1f402cba6b3fca085845f90d62430771cab" => :high_sierra
    sha256 "c7238e859b188c391a111fc06095f0ffdeb2fc4893dcf66592d6c44871904209" => :sierra
    sha256 "c807a735d96482f60543364f33cd706d19647129a8d9d0a3dced6e1d2c2e13f8" => :el_capitan
  end

  depends_on "pkg-config" => :build
  depends_on "cmake" => :build
  depends_on "libssh2" => :recommended
  depends_on "openssl" if MacOS.version <= :lion # Uses SecureTransport on >10.7

  def install
    args = std_cmake_args
    args << "-DBUILD_EXAMPLES=YES"
    args << "-DBUILD_CLAR=NO" # Don't build tests.
    args << "-DUSE_SSH=NO" if build.without? "libssh2"

    mkdir "build" do
      system "cmake", "..", *args
      system "make", "install"
      cd "examples" do
        (pkgshare/"examples").install "add", "blame", "cat-file", "cgit2",
                                      "describe", "diff", "for-each-ref",
                                      "general", "init", "log", "remote",
                                      "rev-list", "rev-parse", "showindex",
                                      "status", "tag"
      end
      system "make", "clean"
      system "cmake", "..", "-DBUILD_SHARED_LIBS=OFF", *args
      system "make"
      lib.install "libgit2.a"
    end
  end

  test do
    (testpath/"test.c").write <<~EOS
      #include <git2.h>

      int main(int argc, char *argv[]) {
        int options = git_libgit2_features();
        return 0;
      }
    EOS
    libssh2 = Formula["libssh2"]
    flags = %W[
      -I#{include}
      -I#{libssh2.opt_include}
      -L#{lib}
      -lgit2
    ]
    system ENV.cc, "test.c", "-o", "test", *flags
    system "./test"
  end
end