class ApplicationPlatform < PlatformAgent
  def ios_app?
    match? /BC3 iOS/
  end

  def android_app?
    match? /BC3 Android/
  end

  def mac_app?
    match?(/Electron/) && match?(/basecamp3/) && match?(/Macintosh/)
  end

  def windows_app?
    match?(/Electron/) && match?(/basecamp3/) && match?(/Windows/)
  end
end

module SetPlatform
  extend ActiveSupport::Concern

  included do
    helper_method :platform
  end

  private
    def platform
      @platform ||= ApplicationPlatform.new(request.user_agent)
    end
end

class ApplicationController < ActionController::Base
  include SetPlatform
end

<% if platform.phone? %>
  Do phone specific stuff!
<% end %>