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

It seems you need this gem

• reverse_markdown

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

• html2markdown

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

• upmark

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