class GemHadar

def gem_hadar_update_task
  namespace :gem_hadar do
    desc 'Update gem_hadar a different version'
    task :update do
      answer = ask?("Which gem_hadar version? ", /^((?:\d+.){2}(?:\d+))$/)
      unless answer
        warn "Invalid version specification!"
        exit 1
      end
      gem_hadar_version = answer[0]
      filename = "#{name}.gemspec"
      old_data = File.read(filename)
      new_data = old_data.gsub(
        /(add_(?:development_)?dependency\(%q<gem_hadar>, \["~> )([\d.]+)("\])/
      ) { "#$1#{gem_hadar_version}#$3" }
      if old_data == new_data
        warn "#{filename.inspect} already depends on gem_hadar "\
          "#{gem_hadar_version} => Do nothing."
      else
        warn "Upgrading #{filename.inspect} to #{gem_hadar_version}."
        secure_write(filename) do |spec|
          spec.write new_data
        end
      end
    end
  end
end