class Gem::Commands::QueryCommand

def execute
  exit_code = 0
  if options[:args].to_a.empty? and options[:name].source.empty?
    name = options[:name]
    no_name = true
  elsif !options[:name].source.empty?
    name = Array(options[:name])
  else
    args = options[:args].to_a
    name = options[:exact] ? args : args.map{|arg| /#{arg}/i }
  end
  prerelease = options[:prerelease]
  unless options[:installed].nil? then
    if no_name then
      alert_error "You must specify a gem name"
      exit_code |= 4
    elsif name.count > 1
      alert_error "You must specify only ONE gem!"
      exit_code |= 4
    else
      installed = installed? name.first, options[:version]
      installed = !installed unless options[:installed]
      if installed then
        say "true"
      else
        say "false"
        exit_code |= 1
      end
    end
    terminate_interaction exit_code
  end
  names = Array(name)
  names.each { |n| show_gems n, prerelease }
end