class VimAT74 < Formula
  desc "Vi 'workalike' with many additional features"
  homepage "https://www.vim.org/"
  url "https://github.com/vim/vim/archive/v7.4.2367.tar.gz"
  sha256 "a9ae4031ccd73cc60e771e8bf9b3c8b7f10f63a67efce7f61cd694cd8d7cda5c"
  revision 14

  bottle do
    sha256 "56e20d97f411cfdc5e7a9bb24328687b72a6b2a1ed26e5356841c2649713084f" => :mojave
    sha256 "18d50a974f9700ecae9d6c5164f091d27c1fcde4fc5841865201372f367df580" => :high_sierra
    sha256 "e2d5e6d6f2f0880158daa46c2a6f8e283d515cd0a48902dfcd92812cab5e55f2" => :sierra
    sha256 "5ed9a339642f5e553511886013d6eecd363827c5560033725142c4e193be5e78" => :el_capitan
  end

  keg_only :versioned_formula

  option "with-override-system-vi", "Override system vi"
  option "without-nls", "Build vim without National Language Support (translated messages, keymaps)"
  option "with-client-server", "Enable client/server mode"

  LANGUAGES_OPTIONAL = %w[lua mzscheme python@2 tcl].freeze
  LANGUAGES_DEFAULT  = %w[python].freeze

  option "with-python@2", "Build vim with python@2 instead of python[3] support"
  LANGUAGES_OPTIONAL.each do |language|
    option "with-#{language}", "Build vim with #{language} support"
  end
  LANGUAGES_DEFAULT.each do |language|
    option "without-#{language}", "Build vim without #{language} support"
  end

  depends_on "perl"
  depends_on "ruby"
  depends_on :x11 if build.with? "client-server"
  depends_on "python" => :recommended
  depends_on "lua" => :optional
  depends_on "luajit" => :optional
  depends_on "python@2" => :optional

  # Python 3.7 compat
  # Equivalent to upstream commit 24 Mar 2018 "patch 8.0.1635: undefining
  # _POSIX_THREADS causes problems with Python 3"
  # See https://github.com/vim/vim/commit/16d7eced1a08565a9837db8067c7b9db5ed68854
  patch :DATA

  def install
    ENV.prepend_path "PATH", Formula["python"].opt_libexec/"bin"

    # https://github.com/Homebrew/homebrew-core/pull/1046
    ENV.delete("SDKROOT")
    ENV["LUA_PREFIX"] = HOMEBREW_PREFIX if build.with?("lua") || build.with?("luajit")

    # vim doesn't require any Python package, unset PYTHONPATH.
    ENV.delete("PYTHONPATH")

    opts = ["--enable-perlinterp", "--enable-rubyinterp"]

    (LANGUAGES_OPTIONAL + LANGUAGES_DEFAULT).each do |language|
      feature = { "python" => "python3", "python@2" => "python" }
      if build.with? language
        opts << "--enable-#{feature.fetch(language, language)}interp"
      end
    end

    if opts.include?("--enable-pythoninterp") && opts.include?("--enable-python3interp")
      # only compile with either python or python@2 support, but not both
      # (if vim74 is compiled with +python3/dyn, the Python[3] library lookup segfaults
      # in other words, a command like ":py3 import sys" leads to a SEGV)
      opts -= %w[--enable-python3interp]
    end

    opts << "--disable-nls" if build.without? "nls"
    opts << "--enable-gui=no"

    if build.with? "client-server"
      opts << "--with-x"
    else
      opts << "--without-x"
    end

    if build.with? "luajit"
      opts << "--with-luajit"
      opts << "--enable-luainterp"
    end

    # We specify HOMEBREW_PREFIX as the prefix to make vim look in the
    # the right place (HOMEBREW_PREFIX/share/vim/{vimrc,vimfiles}) for
    # system vimscript files. We specify the normal installation prefix
    # when calling "make install".
    # Homebrew will use the first suitable Perl & Ruby in your PATH if you
    # build from source. Please don't attempt to hardcode either.
    system "./configure", "--prefix=#{HOMEBREW_PREFIX}",
                          "--mandir=#{man}",
                          "--enable-multibyte",
                          "--with-tlib=ncurses",
                          "--enable-cscope",
                          "--with-compiledby=Homebrew",
                          *opts
    system "make"
    # Parallel install could miss some symlinks
    # https://github.com/vim/vim/issues/1031
    ENV.deparallelize
    # If stripping the binaries is enabled, vim will segfault with
    # statically-linked interpreters like ruby
    # https://github.com/vim/vim/issues/114
    system "make", "install", "prefix=#{prefix}", "STRIP=#{which "true"}"
    bin.install_symlink "vim" => "vi" if build.with? "override-system-vi"
  end

  test do
    if build.with? "python@2"
      (testpath/"commands.vim").write <<~EOS
        :python import vim; vim.current.buffer[0] = 'hello world'
        :wq
      EOS
      system bin/"vim", "-T", "dumb", "-s", "commands.vim", "test.txt"
      assert_equal "hello world", File.read("test.txt").chomp
    elsif build.with? "python"
      (testpath/"commands.vim").write <<~EOS
        :python3 import vim; vim.current.buffer[0] = 'hello python3'
        :wq
      EOS
      system bin/"vim", "-T", "dumb", "-s", "commands.vim", "test.txt"
      assert_equal "hello python3", File.read("test.txt").chomp
    end
  end
end

__END__
diff --git a/src/if_python3.c b/src/if_python3.c
index 02d913492c..59c115dd8d 100644
--- a/src/if_python3.c
+++ b/src/if_python3.c
@@ -34,11 +34,6 @@
 
 #include <limits.h>
 
-/* Python.h defines _POSIX_THREADS itself (if needed) */
-#ifdef _POSIX_THREADS
-# undef _POSIX_THREADS
-#endif
-
 #if defined(_WIN32) && defined(HAVE_FCNTL_H)
 # undef HAVE_FCNTL_H
 #endif