CODEWITHSUNDEEP
ruby-on-railsrubymarkdownerb
sjbuysse
sjbuysse

Reputation: 4154

Rails - Mix erb tags with markdown

I want the users on my blogsite to be able to type in markdown text in a textarea to make a blogpost. This markdown text would then be converted with a tool like Redcarpet or kramdown. Now I also want the user to be able to call a partial view that lays out some pictures. So in other words, I want the user to be able to type in the following code anywhere in between his markdown text (and it being interpreted as erb code) 

<%= render partial: "slider", locals: {imgs: ["image1.jpg", "image2.jpg"]} %>

Is this possible somehow? kramdown allows you to use block-level HTML tags (div, p, pre, …), so maybe this could be used to some advantage?

Upvotes: 0

Views: 655

Answers (1)

Francesco Belladonna
Francesco Belladonna

Reputation: 11729

Do you really want your customers to be able to write ERB? That's extremely dangerous, they can use any Ruby function in ERB, including Kernel functionalities. What about allowing a simple templating system, either a custom one or an existing one. For example you can use Liquid (from Shopify), provide some custom tags so they won't need all the boilerplate but just something like {% dosomething 'partial', 'img1', 'img2' %}, then you first convert liquid into normal text, then you convert markdown to html, cache it and display that to the user. An example: 

# get your customer text from somewhere, like params[:markdown_text]
template = params[:markdown_text]
markdown = Liquid::Template.parse(template).render
html_text = Redcarpet::Markdown.new(renderer, extensions = {}).render(markdown)

puts html_text.to_s # => text with html tags, ensure to use `html_safe` on it in views

And you have your text ready

Upvotes: 4

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