在Ruby on Rails中怎么使用Markdown方法心得,不过依赖于pygments.rb这个工具,首先要安装Python,实现 Markdown 语法和代码语法高亮分别是用的 Redcarpet 和 pygments.rb 两个 Gem:
https://github.com/vmg/redcarpet
https://github.com/tmm1/pygments.rb
https://github.com/richleland/pygments-css
http://pygments.org/docs/lexers/
在/Gemfile中添加如下的两行:
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gem 'redcarpet' gem 'pygments.rb' |
需要指出的是,pygments.rb 依赖于 Python,所以确保机器已经安装了 Python 2.x。
然后在/app/controllers/comments_controller.rb中添加相应 redcarpet 和 pygments.rb 的代码:
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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 end end |
最后在 View 中就能直接调用 markdown 方法来处理博客正文了:
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<%= markdown @post .content %> |
语法规则类似 Github 上的 Markdown,码字效率将会大大的提高。