jekyll - 带有 Jekyll 的预邮器

Question

我正在从事一个既有静态网页又有 HTML 电子邮件模板的项目。

您可能知道，HTML 电子邮件需要内联所有 CSS，这非常难以管理。大多数人使用 Premailer 自动处理此问题 - https://github.com/premailer/premailer

对于特定布局，我将如何使用带有 Jekyll 的 premailer？

是否可以通过插件使用 premailer？

Answer 1

是的，你可以!

安装premailer 后，您可以创建一个jekyll plugin。像这样:

require 'premailer'

module Jekyll
  class Site

    # create an alias for the overriden site::write method
    alias orig_write write

    # we override the site::write method
    def write

      # first call the overriden write method,
      # in order to be sure to find generated css
      orig_write

      # layout name we are looking for in pages/post front matter
      # this can come from site config
      @layout   = 'post'

      # this the css that will be inlined
      # this can come from site config
      @css_path = '/css/main.css'

      # look for generated css file content
      @cssPages = pages.select{ |page|
        page.destination(dest).include? @css_path
      }

      # look again in pages and posts
      # to generate newsletters with premailer
      newsletters = [posts, pages].flatten.select{ |page_or_post|
        page_or_post.data['layout'] == @layout
      }

      newsletters.each do |newsletter|

        newsletter.output = Premailer.new(
            newsletter.output,
            {
                # declare that we pass page html as a string not an url
                :with_html_string => true,
                # also pass css content as a string
                :css_string       => @cssPages.join,
            }
        ).to_inline_css;

        # rewrite the newsletter with inlined css
        newsletter.write(dest)

      end
    end
  end
end

这是关于如何将 premailer 与 Jekyll 集成的总体思路。代码当然可以改进。

注意:我决定不使用 Generator plugin因为当生成器被调用时，sass 和 scss 文件仍然没有被解析并且生成的 css 不可用。