Add categories for posts.

1 files changed, 63 insertions, 0 deletions

diff --git a/_site_build/_plugins/category_indexes.rb b/_site_build/_plugins/category_indexes.rb
new file mode 100644
index 0000000..10dae02
--- /dev/null
+++ b/_site_build/_plugins/category_indexes.rb
@@ -0,0 +1,63 @@
+module Jekyll
+  # Monkey patch so that both GenerateCategoryIndexes and CategoryFilter have access to this method.
+  class Site
+    # A very simple implementation.
+    def parameterize(string, sep = '-')
+      string.downcase.gsub(/[^a-z0-9\-_]+/, sep)
+    end
+  end
+
+  class CategoryIndex < Page
+    def initialize(site, base, dir, category)
+      @site = site
+      @base = base
+      @dir = dir
+      @name = 'index.html'
+
+      self.process(@name)
+      self.read_yaml(File.join(base, '_layouts'), 'category_index.html')
+      self.data['category'] = category
+
+      title_prefix = site.config['category_title_prefix'] || 'Category: '
+      self.data['title'] = "#{title_prefix}#{category}"
+
+      description_prefix = site.config['category_meta_description_prefix'] || 'Category: '
+      self.data['description'] = "#{description_prefix}#{category}"
+    end
+  end
+
+  class GenerateCategoryIndexes < Generator
+    safe true
+    priority :low
+
+    def generate(site)
+      if site.config['generate_category_indexes'] && site.layouts.key?('category_index')
+        dir = site.config['category_dir'] || 'categories'
+        site.categories.keys.each do |category|
+          write_category_index(site, File.join("/#{dir}", site.parameterize(category)), category)
+        end
+      end
+    end
+
+    def write_category_index(site, dir, category)
+      index = CategoryIndex.new(site, site.source, dir, category)
+      index.render(site.layouts, site.site_payload)
+      index.write(site.dest)
+      site.pages << index
+    end
+  end
+
+  module CategoryFilter
+    def category_links(categories)
+      site = @context.registers[:site]
+      directory = site.config['category_dir'] || 'categories'
+      categories = categories.sort.map do |item|
+        '<a href="/' + directory + '/' + site.parameterize(item) + '/" rel="category tag" target="_self" title="View all posted in ' + item +'">' + item + '</a>'
+      end
+      categories.join(', ')
+    end
+  end
+
+end
+
+Liquid::Template.register_filter(Jekyll::CategoryFilter)