class Readline < Formula
  desc "Library for command-line editing"
  homepage "https://tiswww.case.edu/php/chet/readline/rltop.html"
  url "https://ftpmirror.gnu.org/readline/readline-7.0.tar.gz"
  mirror "https://ftp.gnu.org/gnu/readline/readline-7.0.tar.gz"
  sha256 "750d437185286f40a369e1e4f4764eda932b9459b5ec9a731628393dd3d32334"

  bottle do
    cellar :any
    sha256 "9bc3671fa05a042e8de11d5fd7769e45f5bfa674d4cb48c52720c7a3e7a521c6" => :sierra
    sha256 "35451200004c16ac49b5a990f9c0ed88a29eea8627c26db4ddf48020c9a73ec2" => :el_capitan
    sha256 "492648ce1c152c73c32c625926cc7ea6c9c56333a2dfa1f2e235d83ca3d9ee10" => :yosemite
  end

  keg_only :shadowed_by_osx, <<-EOS.undent
    macOS provides the BSD libedit library, which shadows libreadline.
    In order to prevent conflicts when programs look for libreadline we are
    defaulting this GNU Readline installation to keg-only.
  EOS

  def install
    ENV.universal_binary
    system "./configure", "--prefix=#{prefix}", "--enable-multibyte"
    system "make", "install"
  end

  test do
    (testpath/"test.c").write <<-EOS.undent
      #include <stdio.h>
      #include <stdlib.h>
      #include <readline/readline.h>

      int main()
      {
        printf("%s\\n", readline("test> "));
        return 0;
      }
    EOS
    system ENV.cc, "-L", lib, "test.c", "-lreadline", "-o", "test"
    assert_equal "test> Hello, World!\nHello, World!",
      pipe_output("./test", "Hello, World!\n").strip
  end
end