Merge branch 'meta_feature'

app/models/post.rb

@@ -44,8 +44,17 @@ class Post
     self.visited_count
   end
 
+  # 显示给首页截断数据
   def sub_content
-    HTML_Truncator.truncate(content_html,30)
+    HTML_Truncator.truncate(content_html, 300, length_in_chars: true)
+  end
+
+  # 显示给 meta description
+  def meta_content
+    html = HTML_Truncator.truncate(content_html, 100, :length_in_chars => true, ellipsis: '')
+    # 加上 div 以方便 Nokogiri 获取 text()
+    html = '<div>' + html + '</div>'
+    Nokogiri.parse(html).text()
   end
 
   def labels_content( need_blank=false )

app/views/blogs/index.html.slim

@@ -1,3 +1,6 @@
+- if ENV['INTRODUCE'].present? 
+  - content_for(:meta) do
+    meta name="description" content="#{ENV['INTRODUCE'].dup.force_encoding('UTF-8')}"
 - content_for(:title) do
   | 首页
 .row

app/views/blogs/show.html.slim

@@ -1,3 +1,7 @@
+- content_for(:meta) do
+  meta name="description" content="#{@post.meta_content}"
+  meta name="keywords" content=@post.labels_content
+
 - content_for(:title) do
   | #{@post.title}
 .row

app/views/layouts/application.html.slim

@@ -2,6 +2,8 @@ html
   head
     meta charset="utf-8" 
     meta name="viewport" content="width=device-width, initial-scale=1.0"
+    - if content_for?(:meta)
+      = yield(:meta)
     title
       = content_for?(:title) ? yield(:title) + " | #{ENV['SITE_NAME']}" : ENV['SITE_NAME']
     = stylesheet_link_tag    "application"