class Git < Formula
  desc "Distributed revision control system"
  homepage "https://git-scm.com"
  url "https://www.kernel.org/pub/software/scm/git/git-2.5.3.tar.xz"
  sha256 "124d29d857a1282fd2111cf4a021f156e8bae917f455b4551b2aea87f0453a1a"

  head "https://github.com/git/git.git", :shallow => false

  bottle do
    sha256 "1f86c0a58339bd9e9f3a0fe315012c706c3e15cbc9c54320e1355fab822c3130" => :el_capitan
    sha256 "892ea4f6097743df6e154ac1d5fd8c357c6b17bea4b94db88933554c288f045d" => :yosemite
    sha256 "d1d04ee8ad8e67e2b52a8ac3eb0eba9099ddf26d090aafd2ab8128c331a13253" => :mavericks
  end

  resource "man" do
    url "https://www.kernel.org/pub/software/scm/git/git-manpages-2.5.3.tar.xz"
    sha256 "c5d8e9036be741924cf2614f0178a10f0c7d7b1d3efef96c1a08c751596cae3a"
  end

  resource "html" do
    url "https://www.kernel.org/pub/software/scm/git/git-htmldocs-2.5.3.tar.xz"
    sha256 "f87465b5f6d01ceccb314b3e0a3749d642bea1007b0bc78afba868d75413d85e"
  end

  option "with-blk-sha1", "Compile with the block-optimized SHA1 implementation"
  option "without-completions", "Disable bash/zsh completions from 'contrib' directory"
  option "with-brewed-openssl", "Build with Homebrew OpenSSL instead of the system version"
  option "with-brewed-curl", "Use Homebrew's version of cURL library"
  option "with-brewed-svn", "Use Homebrew's version of SVN"
  option "with-persistent-https", "Build git-remote-persistent-https from 'contrib' directory"

  depends_on "pcre" => :optional
  depends_on "gettext" => :optional
  depends_on "openssl" if build.with? "brewed-openssl"
  depends_on "curl" if build.with? "brewed-curl"
  depends_on "go" => :build if build.with? "persistent-https"
  # Trigger an install of swig before subversion, as the "swig" doesn't get pulled in otherwise
  # See https://github.com/Homebrew/homebrew/issues/34554
  if build.with? "brewed-svn"
    depends_on "swig"
    depends_on "subversion" => "with-perl"
  end

  def install
    # If these things are installed, tell Git build system to not use them
    ENV["NO_FINK"] = "1"
    ENV["NO_DARWIN_PORTS"] = "1"
    ENV["V"] = "1" # build verbosely
    ENV["NO_R_TO_GCC_LINKER"] = "1" # pass arguments to LD correctly
    ENV["PYTHON_PATH"] = which "python"
    ENV["PERL_PATH"] = which "perl"

    perl_version = /\d\.\d+/.match(`perl --version`)

    if build.with? "brewed-svn"
      ENV["PERLLIB_EXTRA"] = "#{Formula["subversion"].opt_prefix}/Library/Perl/#{perl_version}/darwin-thread-multi-2level"
    elsif MacOS.version >= :mavericks
      ENV["PERLLIB_EXTRA"] = %W[
        #{MacOS.active_developer_dir}
        /Library/Developer/CommandLineTools
        /Applications/Xcode.app/Contents/Developer
      ].uniq.map do |p|
        "#{p}/Library/Perl/#{perl_version}/darwin-thread-multi-2level"
      end.join(":")
    end

    unless quiet_system ENV["PERL_PATH"], "-e", "use ExtUtils::MakeMaker"
      ENV["NO_PERL_MAKEMAKER"] = "1"
    end

    ENV["BLK_SHA1"] = "1" if build.with? "blk-sha1"

    if build.with? "pcre"
      ENV["USE_LIBPCRE"] = "1"
      ENV["LIBPCREDIR"] = Formula["pcre"].opt_prefix
    end

    ENV["NO_GETTEXT"] = "1" if build.without? "gettext"

    args = %W[
      prefix=#{prefix}
      sysconfdir=#{etc}
      CC=#{ENV.cc}
      CFLAGS=#{ENV.cflags}
      LDFLAGS=#{ENV.ldflags}
    ]
    args << "NO_OPENSSL=1" << "APPLE_COMMON_CRYPTO=1" if build.without? "brewed-openssl"

    system "make", "install", *args

    # Install the OS X keychain credential helper
    cd "contrib/credential/osxkeychain" do
      system "make", "CC=#{ENV.cc}",
                     "CFLAGS=#{ENV.cflags}",
                     "LDFLAGS=#{ENV.ldflags}"
      bin.install "git-credential-osxkeychain"
      system "make", "clean"
    end

    # Install git-subtree
    cd "contrib/subtree" do
      system "make", "CC=#{ENV.cc}",
                     "CFLAGS=#{ENV.cflags}",
                     "LDFLAGS=#{ENV.ldflags}"
      bin.install "git-subtree"
    end

    if build.with? "persistent-https"
      cd "contrib/persistent-https" do
        system "make"
        bin.install "git-remote-persistent-http",
                    "git-remote-persistent-https",
                    "git-remote-persistent-https--proxy"
      end
    end

    if build.with? "completions"
      # install the completion script first because it is inside "contrib"
      bash_completion.install "contrib/completion/git-completion.bash"
      bash_completion.install "contrib/completion/git-prompt.sh"

      zsh_completion.install "contrib/completion/git-completion.zsh" => "_git"
      cp "#{bash_completion}/git-completion.bash", zsh_completion
    end

    (share+"git-core").install "contrib"

    # We could build the manpages ourselves, but the build process depends
    # on many other packages, and is somewhat crazy, this way is easier.
    man.install resource("man")
    (share+"doc/git-doc").install resource("html")

    # Make html docs world-readable
    chmod 0644, Dir["#{share}/doc/git-doc/**/*.{html,txt}"]
    chmod 0755, Dir["#{share}/doc/git-doc/{RelNotes,howto,technical}"]

    # To avoid this feature hooking into the system OpenSSL, remove it.
    # If you need it, install git --with-brewed-openssl.
    rm "#{libexec}/git-core/git-imap-send" if build.without? "brewed-openssl"
  end

  def caveats; <<-EOS.undent
    The OS X keychain credential helper has been installed to:
      #{HOMEBREW_PREFIX}/bin/git-credential-osxkeychain

    The "contrib" directory has been installed to:
      #{HOMEBREW_PREFIX}/share/git-core/contrib
    EOS
  end

  test do
    HOMEBREW_REPOSITORY.cd do
      assert_equal "bin/brew", `#{bin}/git ls-files -- bin`.strip
    end
  end
end