Change A Cask for #{token} is already installed. message.

Library/Homebrew/cask/lib/hbc/cli/install.rb

@@ -27,7 +27,7 @@ module Hbc
           rescue CaskAlreadyInstalledError => e
             opoo e.message
             count += 1
-          rescue CaskAutoUpdatesError => e
+          rescue CaskAlreadyInstalledAutoUpdatesError => e
             opoo e.message
             count += 1
           rescue CaskUnavailableError => e

Library/Homebrew/cask/lib/hbc/exceptions.rb

@@ -29,13 +29,30 @@ module Hbc
 
   class CaskAlreadyInstalledError < AbstractCaskErrorWithToken
     def to_s
-      %Q{A Cask for #{token} is already installed. Add the "--force" option to force re-install.}
+      s = <<-EOS.undent
+        A Cask for #{token} is already installed.
+      EOS
+
+      s.concat("\n").concat(reinstall_message)
+    end
+
+    private
+
+    def reinstall_message
+      <<-EOS.undent
+        To re-install #{token}, run:
+          brew cask uninstall --force #{token}; brew cask install #{token}
+      EOS
     end
   end
 
-  class CaskAutoUpdatesError < AbstractCaskErrorWithToken
+  class CaskAlreadyInstalledAutoUpdatesError < CaskAlreadyInstalledError
     def to_s
-      %Q{A Cask for #{token} is already installed and using auto-updates. Add the "--force" option to force re-install.}
+      s = <<-EOS.undent
+        A Cask for #{token} is already installed and using auto-updates.
+      EOS
+
+      s.concat("\n").concat(reinstall_message)
     end
   end
 

Library/Homebrew/cask/lib/hbc/installer.rb

@@ -58,12 +58,11 @@ module Hbc
     def install
       odebug "Hbc::Installer.install"
 
-      if @cask.installed? && @cask.auto_updates && !force
-        raise CaskAutoUpdatesError, @cask
+      if @cask.installed? && !force
+        raise CaskAlreadyInstalledAutoUpdatesError, @cask if @cask.auto_updates
+        raise CaskAlreadyInstalledError, @cask
       end
 
-      raise CaskAlreadyInstalledError, @cask if @cask.installed? && !force
-
       print_caveats
 
       begin

Library/Homebrew/cask/test/cask/installer_test.rb

@@ -272,7 +272,7 @@ describe Hbc::Installer do
 
       lambda {
         installer.install
-      }.must_raise(Hbc::CaskAutoUpdatesError)
+      }.must_raise(Hbc::CaskAlreadyInstalledAutoUpdatesError)
     end
 
     it "allows already-installed Casks which auto-update to be installed if force is provided" do