Use the Markdown method in Ruby on Rails, railsmarkdown

Use the Markdown method in Ruby on Rails, railsmarkdown

The Redcarpet and pygments. rb are used to implement Markdown syntax and code syntax highlighting respectively:

Https://github.com/vmg/redcarpet
Https://github.com/tmm1/pygments.rb
Https://github.com/richleland/pygments-css
Http://pygments.org/docs/lexers/

Add the following two lines to/Gemfile:

gem 'redcarpet'gem 'pygments.rb'

It must be noted that pygments. rb depends on Python, so ensure that Python 2.xis installed on the machine.

Then add the corresponding redcarpet and pygments. rb code to/app/controllers/comments_controller.rb:

class ApplicationController < ActionController::Base # Prevent CSRF attacks by raising an exception. # For APIs, you may want to use :null_session instead. protect_from_forgery with: :exception helper_method [:markdown] # Highlight code with Pygments class HTMLwithPygments < Redcarpet::Render::HTML  def block_code(code, language)   language = "text" if language.blank?   sha = Digest::SHA1.hexdigest(code)   Rails.cache.fetch ["code", language, sha].join("-") do    Pygments.highlight(code, :lexer => language)   end  end end protected # Markdown with Redcarpet def markdown(text)  renderer = HTMLwithPygments.new({   :filter_html => true,   :hard_wrap => true,   :link_attributes => {:rel => 'external nofollow'}  })  options = {   :autolink => true,   :no_intra_emphasis => true,   :fenced_code_blocks => true,   :lax_html_blocks => true,   :strikethrough => true,   :superscript => true,   :tables => true  }  Redcarpet::Markdown.new(renderer, options).render(text).html_safe endend

Finally, you can directly call the markdown method in View to process the blog body:

<%= markdown @post.content %>

Syntax rules are similar to Markdown on Github, which greatly improves the efficiency of code words.