Class: ActionMailer::InStyle::Premailer

Inherits:
Premailer
  • Object
show all
Defined in:
lib/action_mailer/in_style/premailer.rb

Instance Method Summary collapse

Instance Method Details

#load_css_from_asset_pipeline! ⇒ Object

Uses sprockets and the Rails ~>3.1 asset pipeline to load the compiled CSS from stylesheet links within the header of the email template.



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# File 'lib/action_mailer/in_style/premailer.rb', line 14

def load_css_from_asset_pipeline!
  if tags = @doc.search("link[@rel='stylesheet'], style")
    tags.each do |tag|
      if tag.to_s.strip =~ /^\<link/i && tag.attributes['href'] && media_type_ok?(tag.attributes['media'])

        # If the stylesheet link begins with /assets we must be using the asset pipeline
        # to generate the css. In this case we should be able to retrieve the css directly
        # from sprockets
        if tag.attributes['href'].to_s =~ /\/assets\//
          link_uri = process_stylesheet_url(tag.attributes['href'])
          asset = Rails.application.assets.find_asset(link_uri)
          @css_parser.add_block!(asset.body) if asset
        end
      end
    end
  end
end

#load_css_from_html! ⇒ Object 



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# File 'lib/action_mailer/in_style/premailer.rb', line 6

def load_css_from_html!
  load_css_from_asset_pipeline!
  super
end

#process_stylesheet_url(href) ⇒ Object 



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# File 'lib/action_mailer/in_style/premailer.rb', line 32

def process_stylesheet_url(href)
  # Example stylesheet url: email-1bd4488901bfc2f2ccf4f044fc9154a6.css
  href = href.to_s.sub(/\?[0-9a-zA-Z]+$/, '').sub(/^\/assets\//, '')

  if href =~ /(\w+)\-(?:[0-9a-zA-Z]{32})\.([a-z]{3})/
    href = href.gsub(/(\w+)\-(?:[0-9a-zA-Z]{32})\.([a-z]{3})/, [$1,$2].join('.'))
  end

  return href
end