It's ready for you, world.

.gitignore

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+/spec/fixture/.*
+/spec/fixture/_site
+/Gemfile.lock
+/coverage
+/.bundle
+/vendor

.rspec

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+--color

.travis.yml

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+rvm:
+  - 2.0
+  - 2.1
+  - 2.2
+notifications:
+  recipients:
+    - jordon@envygeeks.io
+branches:
+  only:
+    - master

Gemfile

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+source "https://rubygems.org"
+gemspec
+
+gem "rake"
+group :development do
+  gem "pry"
+end

LICENSE

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+Copyright 2015 Jordon Bedwell.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+[![Build Status](https://travis-ci.org/envygeeks/ruby-jekyll3-post-tags.png?branch=master)](https://travis-ci.org/envygeeks/ruby-jekyll3-post-tags) [![Coverage Status](https://coveralls.io/repos/envygeeks/ruby-jekyll3-post-tags/badge.png?branch=master)](https://coveralls.io/r/envygeeks/ruby-jekyll3-post-tags) [![Code Climate](https://codeclimate.com/github/envygeeks/ruby-jekyll3-post-tags/badges/gpa.svg)](https://codeclimate.com/github/envygeeks/ruby-jekyll3-post-tags) [![Dependency Status](https://gemnasium.com/envygeeks/ruby-jekyll3-post-tags.svg)](https://gemnasium.com/envygeeks/ruby-jekyll3-post-tags)

Rakefile

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+require "rspec/core/rake_task"
+RSpec::Core::RakeTask.new(:spec)
+task :default => [:spec]

jekyll3-post-tags.gemspec

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+$:.unshift(File.expand_path("../lib", __FILE__))
+require "jekyll/post/tags/version"
+
+Gem::Specification.new do |spec|
+  spec.description = "Assets using Sprockets 3 for your Jekyll 3"
+  spec.files = %W(Rakefile Gemfile README.md LICENSE) + Dir["lib/**/*"]
+  spec.homepage = "http://github.com/envygeeks/ruby-jekyll3-post-tags/"
+  spec.version = Jekyll::Post::Tags::VERSION
+  spec.summary = "Post Tags for Jekyll3"
+  spec.email = ["jordon@envygeeks.io"]
+  spec.name = "jekyll3-post-tags"
+  spec.license = "MIT"
+  spec.has_rdoc = false
+  spec.require_paths = ["lib"]
+  spec.authors = ["Jordon Bedwell"]
+
+  spec.add_runtime_dependency("jekyll", "~> 3.0.0.pre.beta7")
+  spec.add_development_dependency("envygeeks-coveralls", "~> 1.0")
+  spec.add_development_dependency("luna-rspec-formatters", "~> 3.3")
+  spec.add_development_dependency("rspec", "~> 3.3")
+end

lib/jekyll/post/tags.rb

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+require "jekyll"
+require "jekyll/post"
+require_relative "tags/generator"
+require_relative "tags/template"

lib/jekyll/post/tags/generator.rb

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+module Jekyll
+  module Tags
+    class Generator < Jekyll::Generator
+      priority :low; safe true
+
+      def generate(site)
+        if site.layouts.has_key?("tag")
+          then site.tags.keys.each do |t|
+            site.pages.push(
+              Post::Tags::Template.new(
+                site, t
+              )
+            )
+          end
+        end
+      end
+    end
+  end
+end

lib/jekyll/post/tags/template.rb

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+module Jekyll
+  class Post
+    module Tags
+      class Template < Jekyll::Page
+        attr_accessor :site, :base, :tag, :dir, :name, :tag_layout
+
+        def initialize(site, tag)
+          @site = site
+          @tag = tag
+          @base = site.source
+          @dir, @name = tag_path
+          @tag_layout = "tag.html"
+          process_tag_template
+          setup_defaults
+        end
+
+        def regenerate?
+          @site.posts.any? do |v|
+            @site.regenerator.regenerate?(v)
+          end
+        end
+
+        def write(*a)
+          if regenerate?
+            super
+          end
+        end
+
+        def render(*a)
+          if regenerate?
+            super
+          end
+        end
+
+        private
+        def process_tag_template
+          base = File.join(@base, @site.config["layouts"])
+          read_yaml(base, @tag_layout)
+          process(@name)
+        end
+
+        private
+        def tag_path
+          pth = @site.config["tag_permalink"] ||= "tag/:tag"
+          pth = pth.sub(":tag", @tag).gsub(/\A\//, "").split(
+            "/"
+          )
+
+          unless pth[-1] =~ /\.html$/
+            pth[-1] = "#{pth[-1]}.html"
+          end
+
+          [
+            pth[0...-1].join("/"),
+            pth.last
+          ]
+        end
+
+        private
+        def setup_defaults
+          @data["title"] ||= "Tag: #{@tag}"
+          @data["description"] ||= "Tag: #{@tag}"
+          @data["tag"] = @tag
+        end
+      end
+    end
+  end
+end

lib/jekyll/post/tags/version.rb

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+module Jekyll
+  class Post
+    module Tags
+      VERSION = "0.0.1"
+    end
+  end
+end

spec/fixture/_layouts/default.html

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+---
+---
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>{{ page.title }}</title>
+  </head>
+  <body>
+    {{ content }}
+  </body>
+</html>

spec/fixture/_layouts/tag.html

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+---
+layout: default
+recent: false
+sidebar: "blog"
+heading: true
+---
+
+<ul class="tags">
+  {% for post in site.tags[page.tag] %}
+    <li>{{ page.tag }}</li>
+  {% endfor %}
+</ul>

spec/fixture/_posts/2014-07-14-test-post.md

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+---
+tags: [hello, world]
+---
+
+Hello World

spec/lib/jekyll/post/tags_spec.rb

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+require "rspec/helper"
+describe Jekyll::Post::Tags do
+  before :each do
+    silence_stdout do
+      stub_jekyll_site.process
+    end
+  end
+
+  let :base do
+    File.expand_path("../../../../fixture/_site", __FILE__)
+  end
+
+  it "should generate html pages" do
+    expect(Pathname.new(File.join(base, "tag/hello.html"))).to exist
+    expect(Pathname.new(File.join(base, "tag/world.html"))).to exist
+  end
+end

spec/rspec/helper.rb

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+require "rspec"
+require "support/simplecov"
+require "luna/rspec/formatters/checks"
+require "jekyll/post/tags"
+require "jekyll"
+
+Dir[File.expand_path("../../support/*.rb", __FILE__)].each do |v|
+  require v
+end

spec/support/jekyll.rb

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+module Jekyll::RSpecHelpers
+  def silence_stdout(return_stringio = false)
+    old_stdout, old_stderr = $stdout, $stderr
+    $stdout = stdout = StringIO.new
+    $stderr = stderr = StringIO.new
+    output  = yield
+    if return_stringio
+      return [
+        $stdout.string,
+        $stderr.string
+      ]
+    else
+      return output
+    end
+  ensure
+    $stdout = old_stdout
+    $stderr = old_stderr
+  end
+
+  def capture_stdout(&block)
+    return silence_stdout(
+      true, &block
+    )
+  end
+
+  def strip_ansi(str)
+    str.gsub(
+      /\e\[(?:\d+)(?:;\d+)?m/, ""
+    )
+  end
+
+  def stub_jekyll_site(oth_opts = {})
+    opts = Jekyll::Utils.deep_merge_hashes(
+      Jekyll::Configuration::DEFAULTS, {
+        "full_rebuild" => true,
+        "source"       => File.expand_path("../../fixture",       __FILE__),
+        "destination"  => File.expand_path("../../fixture/_site", __FILE__)
+      }
+    )
+
+    Jekyll::Site.new(
+      Jekyll::Utils.deep_merge_hashes(
+        opts, oth_opts
+      )
+    )
+  end
+
+  def get_stubbed_file(file)
+    File.read(
+      File.join(
+        File.expand_path("../../fixture/_site", __FILE__), file
+      )
+    )
+  end
+
+  class << self
+    def cleanup_trash
+      %W(.asset-cache .jekyll-metadata _site _assets/manifest.json).each do |v|
+        FileUtils.rm_rf(
+          File.join(
+            File.expand_path("../../fixture", __FILE__), v
+          )
+        )
+      end
+    end
+  end
+end
+
+RSpec.configure do |c|
+  c.include Jekyll::RSpecHelpers
+  c.before(:each) { Jekyll::RSpecHelpers.cleanup_trash }
+  c.after (:each) { Jekyll::RSpecHelpers.cleanup_trash }
+end

spec/support/simplecov.rb

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+require "envygeeks/coveralls"
+SimpleCov.start do
+  add_filter "/spec/"
+  add_filter "/vendor/"
+end