coderay追加

Gemfile

@@ -48,8 +48,12 @@ end
 gem 'devise'
 gem 'omniauth-google-oauth2'
 
+# Markdown
 gem 'redcarpet'
 
+# Syntax Highlight
+gem 'coderay'
+
 group :development do
   # Use sqlite3 as the database for Active Record
   gem 'sqlite3'

Gemfile.lock

@@ -157,6 +157,7 @@ PLATFORMS
 DEPENDENCIES
   better_errors
   binding_of_caller
+  coderay
   coffee-rails (~> 4.0.0)
   devise
   jbuilder (~> 1.2)

app/helpers/application_helper.rb

 module ApplicationHelper
 
+  class HTMLwithCoderay < Redcarpet::Render::HTML
+    def block_code(code, language)
+      case language.to_s
+      when 'rb'
+        lang = 'ruby'
+      when 'yml'
+        lang = 'yaml'
+      when ''
+        lang = 'md'
+      else
+        lang = 'md'
+      end
+
+      CodeRay.scan(code, lang).div
+    end
+  end
+
+
   def h_application_format_markdown(text)
-    markdown = Redcarpet::Markdown.new(Redcarpet::Render::HTML, :autolink => true, :space_after_headers => true)
+    html_render = HTMLwithCoderay.new(filter_html: true, hard_wrap: true)
+    options = {
+      autolink: true,
+      space_after_headers: true,
+      fenced_code_blocks: true,
+      tables: true
+    }
+    markdown    = Redcarpet::Markdown.new(html_render, options)
     markdown.render(text).html_safe
   end