Speed up cask search

Add new method to get all cask names
without using Cask.all which is slow
in this case.

Library/Homebrew/cask/cask.rb

@@ -38,6 +38,16 @@ module Cask
       end.compact
     end
 
+    def self.full_names
+      Tap.flat_map do |tap|
+        next tap.cask_tokens.blank?
+        next tap.cask_tokens if tap.user == "Homebrew"
+
+        name = tap.name
+        tap.cask_tokens.map { |tok| "#{name}/#{tok}" }
+      end.flatten
+    end
+
     def tap
       return super if block_given? # Object#tap
 

Library/Homebrew/extend/os/mac/search.rb

@@ -37,7 +37,7 @@ module Homebrew
         results = cask_tokens.extend(Searchable)
                              .search(string_or_regex)
 
-        cask_names = Cask::Cask.all.map(&:full_name)
+        cask_names = Cask::Cask.full_names
         results += DidYouMean::SpellChecker.new(dictionary: cask_names)
                                            .correct(string_or_regex)