Auto text part

text_mail_interceptor.rb

# You just put this in config/initializers. Dont create text.erb files! ;)
# Text parts are auto-generated from html.erb templates.

include ActionView::Helpers::SanitizeHelper

class TextMailInterceptor
  def self.delivering_email(message)
    html = message.html_part.try(:body).try(:to_s) || message.body.to_s
    text = HTMLEntities.new.decode(html).gsub(/<a.+?href=("|')([^"']+).*?>(.+?)<\/a>/, "\\2: \\3")
    attachments = message.attachments
    message.body = ''
    if message.multipart?
      message.part :content_type => "multipart/alternative", :charset => message.charset do |p|
        p.part :content_type => "text/plain", :body => strip_tags(text), :charset => message.charset
        p.part :content_type => "text/html", :body => html, :charset => message.charset
      end
    else
      message.html_part = Mail::Part.new({:content_type => "text/html", :body => html, :charset => message.charset})
      message.text_part = Mail::Part.new({:content_type => "text/plain", :body => strip_tags(text), :charset => message.charset})
    end
    attachments.each do |attachment|
      message.add_part(attachment)
    end
  end
end

ActionMailer::Base.register_interceptor(TextMailInterceptor)