rwd-tester.rb

#!/usr/bin/env ruby
# usage: ./rwd-tester.rb FILE
# the file is a url list
# install mechanize by `gem install mechanize`.

# require 'rubygems'
require 'mechanize'

def get_page(url)
  agent = Mechanize.new
  agent.agent.http.verify_mode = OpenSSL::SSL::VERIFY_NONE
  page = agent.get(url)
  return page
end

def get_css_urls(page)
  result = []
  page.css('link').each do |link|
    href = link.attr('href').to_s
    if href.match(/\.css$/)
      href = page.mech.resolve(href).to_s
      result << href
    end
  end
  return result
end

def get_css_url(url)
  css = ""
  begin
    page = get_page(url)
    css = page.body.to_s
  end
  return css
end

def parse_css(css)
  css = css.gsub(/\/\*.*\*\//, '')
  result = false
  if css.match(/@media/)
    result = true
  end
  return result
end

def parse_css_in_html(page)
  result = false
  page.css('style').each do |style|
    css = style.text
    result = parse_css(css)
    if result == true
      break
    end
  end
  return result
end

def find_device_width(page)
  viewport = page.at('meta[name="viewport"]')
  return false unless viewport
  content = viewport.attr('content').to_s
  if content.match(/width=device-width/)
    return true
  else
    return false
  end
end

def detect_rwd(url)
  begin
    page = get_page(url)
    device_width = find_device_width(page)
    media = parse_css_in_html(page)
    if not media
      css_urls = get_css_urls(page)
      css_urls.each do |css_url|
        css = get_css_url(css_url)
        if parse_css(css)
          media = true
          break
        end
      end
    end
    puts "#{url},#{device_width},#{media},\n"
  rescue => error
    error_line = nil
    error.backtrace.each do |backtrace|
      if backtrace.match(/rwd-tester\.rb/)
        error_line = backtrace
        break
      end
    end
    error = "#{error_line} #{error.to_s}"
    puts "#{url},n/a,n/a,\"#{error}\"\n"
  end
end

def main
  puts "url,viewport,media,error\n"
  urls = File.readlines(ARGV[0]).map {|i| i.strip }
  urls.each do |url|
    detect_rwd(url)
  end
end

main()