brew/Library/Homebrew/cask/lib/hbc/cli/uninstall.rb

module Hbc
  class CLI
    class Uninstall < AbstractCommand
      option "--force", :force, false

      def initialize(*)
        super
        raise CaskUnspecifiedError if args.empty?
      end

      def run
        casks.each do |cask|
          odebug "Uninstalling Cask #{cask}"

          raise CaskNotInstalledError, cask unless cask.installed? || force?

          if cask.installed? && !cask.installed_caskfile.nil?
            # use the same cask file that was used for installation, if possible
            cask = CaskLoader.load(cask.installed_caskfile) if cask.installed_caskfile.exist?
          end

          Installer.new(cask, binaries: binaries?, verbose: verbose?, force: force?).uninstall

          next if (versions = cask.versions).empty?

          single = versions.count == 1

          puts <<~EOS
            #{cask} #{versions.join(", ")} #{single ? "is" : "are"} still installed.
            Remove #{single ? "it" : "them all"} with `brew cask uninstall --force #{cask}`.
          EOS
        end
      end

      def self.help
        "uninstalls the given Cask"
      end
    end
  end
end