Jekyll - Custom Plugin

1module Jekyll
2  class ReadingTimeTag < Liquid::Tag
3    WORDS_PER_MINUTE = 200
4 
5    def initialize(tag_name, text, tokens)
6      super
7      @text = text.strip
8    end
9 
10    def render(context)
11      content = context[@text] || context.registers[:page]['content']
12      words = content.split.size
13      minutes = (words / WORDS_PER_MINUTE.to_f).ceil
14      "#{minutes} min read"
15    end
16  end
17 
18  class CategoryPageGenerator < Generator
19    safe true
20    priority :low
21 
22    def generate(site)
23      site.categories.each do |category, posts|
24        site.pages << CategoryPage.new(site, category, posts)
25      end
26    end
27  end
28 
29  class CategoryPage < Page
30    def initialize(site, category, posts)
31      @site = site
32      @base = site.source
33      @dir = "categories/#{category.downcase}"
34      @name = 'index.html'
35 
36      process(@name)
37      read_yaml(File.join(@base, '_layouts'), 'category.html')
38      data['category'] = category
39      data['posts'] = posts
40    end
41  end
42end
43 
44Liquid::Template.register_tag('reading_time', Jekyll::ReadingTimeTag)