CODEWITHSUNDEEP
htmlruby-on-railsruby-on-rails-3markdown
Florian Dano Clement
Florian Dano Clement

Reputation: 257

Convert HTML to markdown

I have an app and the admin can create article , and i use the markitup markdown editor for add title etc. Now in my view i want convert this markdown text in html.

So in my view if for exemple when admin write the article he write exemple , in the view the text are in bold.

I hope you understand and you can help me.

I install redcarpet and i put in my application helper this :

module ApplicationHelper


 def markdown(text)
if text
  markdown = Redcarpet::Markdown.new(
    Redcarpet::Render::HTML.new
  )
  markdown.render(text).html_safe
end

end

and in my show view this :

 <%= markdown(@article.content) %>

I restarted my server but i have one error :

uninitialized constant ApplicationHelper::Redcarpet

Upvotes: 11

Views: 9538

Answers (3)

rails_id
rails_id

Reputation: 8220

It seems you need this gem

Transform existing html into markdown in a simple way, for example if you want to import existings tags into your markdown based application.

Simple html to Markdown ruby gem We love markdown, cause it is friendly to edit. So we want everything to be markdown

A HTML to Markdown converter.

Upmark defines a parsing expression grammar (PEG) using the very awesome Parslet gem. This PEG is then used to convert HTML into Markdown in 4 steps:

  1. Parse the XHTML into an abstract syntax tree (AST).
  2. Normalize the AST into a nested hash of HTML elements.
  3. Mark the block and span-level subtrees which should be ignored (table, div, span, etc).
  4. Convert the AST leaves into Markdown.

uninitialized constant ApplicationHelper::Redcarpet

Add require 'redcarpet' before module ApplicationHelper

require 'redcarpet'
module ApplicationHelper


  def markdown(text)
    Redcarpet.new(text).html_safe
  end
end

Upvotes: 18

Rob
Rob

Reputation: 933

The kramdown gem provides an HTML to Markdown solution in pure Ruby.

irb> html = 'How to convert <b>HTML</b> to <i>Markdown</i> on <a href="http://stackoverflow.com">Stack Overflow</a>.'
=> "How to convert <b>HTML</b> to <i>Markdown</i> on <a href=\"http://stackoverflow.com\">Stack Overflow</a>."
irb> document = Kramdown::Document.new(html, :html_to_native => true)
=> <KD:Document: ... >
irb> document.to_kramdown
=> "How to convert **HTML** to *Markdown* on [Stack Overflow][1].\n\n\n\n[1]: http://stackoverflow.com\n"

Upvotes: 18

Daniel
Daniel

Reputation: 4173

You can use the redcarpet gem to compile markdown into html in rails.

With redcarpet you can than do the following:

# application_helper.rb
module ApplicationHelper

  def markdown(text)
    if text
      markdown = Redcarpet::Markdown.new(
        Redcarpet::Render::HTML.new
      )
      markdown.render(text).html_safe
    end
  end
end

# some_view.html.erb
<%= markdown(@article.body) %>

Upvotes: 4

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