remove homebrew-fork xquartz.rb

On review, the primary gain from adopting this code is the
libpng detection method used in #8519.  The rest of the
logic is not useful to us until/unless we start requiring
specific X11 versions in `depends_on :x11`.

lib/homebrew-fork/Library/Homebrew/macos/xquartz.rb

@@ -1,121 +0,0 @@
-module Cask::MacOS::XQuartz
-  extend self
-
-  FORGE_BUNDLE_ID = "org.macosforge.xquartz.X11"
-  APPLE_BUNDLE_ID = "org.x.X11"
-  FORGE_PKG_ID = "org.macosforge.xquartz.pkg"
-
-  PKGINFO_VERSION_MAP = {
-                         "2.6.34" => "2.6.3",
-                         "2.7.4"  => "2.7.0",
-                         "2.7.14" => "2.7.1",
-                         "2.7.28" => "2.7.2",
-                         "2.7.32" => "2.7.3",
-                         "2.7.43" => "2.7.4",
-                         "2.7.50" => "2.7.5_rc1",
-                         "2.7.51" => "2.7.5_rc2",
-                         "2.7.52" => "2.7.5_rc3",
-                         "2.7.53" => "2.7.5_rc4",
-                         "2.7.54" => "2.7.5",
-                         "2.7.61" => "2.7.6",
-                         "2.7.73" => "2.7.7",
-                        }.freeze
-
-  # This returns the version number of XQuartz, not of the upstream X.org.
-  # The X11.app distributed by Apple is also XQuartz, and therefore covered
-  # by this method.
-  def version
-    @version ||= detect_version
-  end
-
-  def detect_version
-    if (path = bundle_path) && path.exist? && (version = version_from_mdls(path))
-      version
-    elsif prefix.to_s == "/usr/X11"
-      guess_system_version
-    else
-      version_from_pkgutil
-    end
-  end
-
-  # http://xquartz.macosforge.org/trac/wiki
-  # http://xquartz.macosforge.org/trac/wiki/Releases
-  def latest_version
-    case MacOS.release
-    when "10.5"
-      "2.6.3"
-    else
-      "2.7.7"
-    end
-  end
-
-  def bundle_path
-    MacOS.app_with_bundle_id(FORGE_BUNDLE_ID, APPLE_BUNDLE_ID)
-  end
-
-  def version_from_mdls(path)
-    version = Utils.popen_read(
-      "/usr/bin/mdls", "-raw", "-nullMarker", "", "-name", "kMDItemVersion", path.to_s
-    ).strip
-    version unless version.empty?
-  end
-
-  # The XQuartz that Apple shipped in OS X through 10.7 does not have a
-  # pkg-util entry, so if Spotlight indexing is disabled we must make an
-  # educated guess as to what version is installed.
-  def guess_system_version
-    case MacOS.release
-    when '10.5' then '2.1.6'
-    when '10.6' then '2.3.6'
-    when '10.7' then '2.6.3'
-    else 'dunno'
-    end
-  end
-
-  # Upstream XQuartz *does* have a pkg-info entry, so if we can't get it
-  # from mdls, we can try pkgutil. This is very slow.
-  def version_from_pkgutil
-    str = MacOS.pkgutil_info(FORGE_PKG_ID)[/version: (\d\.\d\.\d+)$/, 1]
-    PKGINFO_VERSION_MAP.fetch(str, str)
-  end
-
-  def provided_by_apple?
-    [FORGE_BUNDLE_ID, APPLE_BUNDLE_ID].find do |id|
-      MacOS.app_with_bundle_id(id)
-    end == APPLE_BUNDLE_ID
-  end
-
-  # This should really be private, but for compatibility reasons it must
-  # remain public. New code should use MacOS::X11.{bin,lib,include}
-  # instead, as that accounts for Xcode-only systems.
-  def prefix
-    @prefix ||= if Pathname.new('/opt/X11/lib/libpng.dylib').exist?
-      Pathname.new('/opt/X11')
-    elsif Pathname.new('/usr/X11/lib/libpng.dylib').exist?
-      Pathname.new('/usr/X11')
-    end
-  end
-
-  def installed?
-    !version.nil? && !prefix.nil?
-  end
-
-  def bin
-    prefix.join("bin")
-  end
-
-  def share
-    prefix.join("share")
-  end
-
-  def app_with_bundle_id(*ids)
-    path = mdfind(*ids).first
-    Pathname.new(path) unless path.nil? or path.empty?
-  end
-
-  def pkgutil_info(id)
-    (@pkginfo ||= {}).fetch(id) do |key|
-      @pkginfo[key] = Utils.popen_read("/usr/sbin/pkgutil", "--pkg-info", key).strip
-    end
-  end
-end