caskroom: add, use any_casks_installed?.

Add a new method for the two places we're checking if we have any
casks installed. This is much more performance and user friendly than
attempting to load every cask.

Fixes #13027

Library/Homebrew/cask/caskroom.rb

@@ -12,7 +12,14 @@ module Caskroom
 
  sig { returns(Pathname) }
  def self.path
- @path ||= HOMEBREW_PREFIX.join("Caskroom")
+ @path ||= HOMEBREW_PREFIX/"Caskroom"
+ end
+
+ sig { returns(T::Boolean) }
+ def self.any_casks_installed?
+ return false unless path.exist?
+
+ path.children.select(&:directory?).any?
  end
 
  sig { void }
@@ -36,7 +43,7 @@ def self.ensure_caskroom_exists
  def self.casks(config: nil)
  return [] unless path.exist?
 
- Pathname.glob(path.join("*")).sort.select(&:directory?).map do |path|
+ path.children.select(&:directory?).sort.map do |path|
  token = path.basename.to_s
 
  if (tap_path = CaskLoader.tap_paths(token).first)

Library/Homebrew/cmd/doctor.rb

@@ -48,7 +48,7 @@ def doctor
  check_missing_deps
  ]
  methods = (checks.all - slow_checks) + slow_checks
- methods -= checks.cask_checks if Cask::Caskroom.casks.blank?
+ methods -= checks.cask_checks unless Cask::Caskroom.any_casks_installed?
  else
  methods = args.named
  end

Library/Homebrew/cmd/list.rb

@@ -113,7 +113,7 @@ def list
  ohai "Formulae" if $stdout.tty? && !args.formula?
  safe_system "ls", *ls_args, HOMEBREW_CELLAR
  end
- if !args.formula? && Cask::Caskroom.casks.any?
+ if !args.formula? && Cask::Caskroom.any_casks_installed?
  if $stdout.tty? && !args.cask?
  puts
  ohai "Casks"