Merge pull request #6247 from zachauten/suggest-cask-cmd

brew install will suggest brew cask install

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

@@ -19,7 +19,11 @@ module Homebrew
 
         cask = Cask::CaskLoader.load(name)
         reason = +"Found a cask named \"#{name}\" instead.\n"
-        reason << Cask::Cmd::Info.get_info(cask) if show_info
+        if show_info
+          reason << Cask::Cmd::Info.get_info(cask)
+        else
+          reason << "Did you mean to type \"brew cask install #{name}\"?\n"
+        end
         reason.freeze
       rescue Cask::CaskUnavailableError
         nil

Library/Homebrew/test/missing_formula_spec.rb

@@ -100,6 +100,7 @@ describe Homebrew::MissingFormula do
       let(:show_info) { false }
 
       it { is_expected.to match(/Found a cask named "local-caffeine" instead./) }
+      it { is_expected.to match(/Did you mean to type "brew cask install local-caffeine"?/) }
     end
 
     context "with a formula name that is a cask and show_info: true" do