class Findutils < Formula
  desc "Collection of GNU find, xargs, and locate"
  homepage "https://www.gnu.org/software/findutils/"
  url "https://ftp.gnu.org/gnu/findutils/findutils-4.6.0.tar.gz"
  mirror "https://ftpmirror.gnu.org/findutils/findutils-4.6.0.tar.gz"
  sha256 "ded4c9f73731cd48fec3b6bdaccce896473b6d8e337e9612e16cf1431bb1169d"

  bottle do
    rebuild 2
    sha256 "8411fd3a9a42a2be0c52b4ae8cad2dd60add473a4cf882620200ab43442fb5c2" => :high_sierra
    sha256 "c1ecad1c780cb569d268ca5648570dcc753cca720ead2783943aea0363af728e" => :sierra
    sha256 "bc20b7e2a97c3277ea13fd91b44fbc0015628e8684a2bba203c38a4c7357f6c7" => :el_capitan
  end

  deprecated_option "default-names" => "with-default-names"

  option "with-default-names", "Do not prepend 'g' to the binary"

  def install
    # Work around unremovable, nested dirs bug that affects lots of
    # GNU projects. See:
    # https://github.com/Homebrew/homebrew/issues/45273
    # https://github.com/Homebrew/homebrew/issues/44993
    # This is thought to be an el_capitan bug:
    # https://lists.gnu.org/archive/html/bug-tar/2015-10/msg00017.html
    ENV["gl_cv_func_getcwd_abort_bug"] = "no" if MacOS.version == :el_capitan

    args = %W[
      --prefix=#{prefix}
      --localstatedir=#{var}/locate
      --disable-dependency-tracking
      --disable-debug
    ]
    args << "--program-prefix=g" if build.without? "default-names"

    system "./configure", *args
    system "make", "install"

    # https://savannah.gnu.org/bugs/index.php?46846
    # https://github.com/Homebrew/homebrew/issues/47791
    updatedb = (build.with?("default-names") ? "updatedb" : "gupdatedb")
    (libexec/"bin").install bin/updatedb
    (bin/updatedb).write <<~EOS
      #!/bin/sh
      export LC_ALL='C'
      exec "#{libexec}/bin/#{updatedb}" "$@"
    EOS

    if build.without? "default-names"
      [[prefix, bin], [share, man/"*"]].each do |base, path|
        Dir[path/"g*"].each do |p|
          f = Pathname.new(p)
          gnupath = "gnu" + f.relative_path_from(base).dirname
          (libexec/gnupath).install_symlink f => f.basename.sub(/^g/, "")
        end
      end
    end
  end

  def post_install
    (var/"locate").mkpath
  end

  def caveats
    if build.without? "default-names"
      <<~EOS
        All commands have been installed with the prefix 'g'.
        If you do not want the prefix, install using the "with-default-names" option.

        If you need to use these commands with their normal names, you
        can add a "gnubin" directory to your PATH from your bashrc like:

            PATH="#{opt_libexec}/gnubin:$PATH"

        Additionally, you can access their man pages with normal names if you add
        the "gnuman" directory to your MANPATH from your bashrc as well:

            MANPATH="#{opt_libexec}/gnuman:$MANPATH"
      EOS
    end
  end

  test do
    find = (build.with?("default-names") ? "find" : "gfind")
    touch "HOMEBREW"
    assert_match "HOMEBREW", shell_output("#{bin}/#{find} .")
  end
end