home: Add disclaimer for opening formula that shadows cask

Library/Homebrew/cmd/home.rb

@@ -25,7 +25,10 @@ module Homebrew
     end
 
     homepages = args.formulae_and_casks.map do |formula_or_cask|
-      puts "Opening homepage for #{name_of(formula_or_cask)}"
+      disclaimer = disclaimers(formula_or_cask)
+      disclaimer = " (#{disclaimer})" if disclaimer.present?
+
+      puts "Opening homepage for #{name_of(formula_or_cask)}#{disclaimer}"
       formula_or_cask.homepage
     end
 
@@ -39,4 +42,15 @@ module Homebrew
       "Cask #{formula_or_cask.token}"
     end
   end
+
+  def disclaimers(formula_or_cask)
+    return unless formula_or_cask.is_a? Formula
+
+    begin
+      cask = Cask::CaskLoader.load formula_or_cask.name
+      "for the cask, use #{cask.tap.name}/#{cask.token}"
+    rescue Cask::CaskUnavailableError
+      nil
+    end
+  end
 end