Add gems for better plugin management

Gemfile

@@ -1,2 +1,2 @@
 source 'https://rubygems.org'
-gemspec
+gemspec

features/site_configuration.feature

@@ -225,3 +225,11 @@ Feature: Site configuration
     And I should see "Page Layout: 2 on 2010-01-01" in "_site/index.html"
     And I should see "Post Layout: <p>content for entry1.</p>" in "_site/2007/12/31/entry1.html"
     And I should see "Post Layout: <p>content for entry2.</p>" in "_site/2020/01/31/entry2.html"
+
+  Scenario: Add a gem-based plugin
+    Given I have an "index.html" file that contains "Whatever"
+    And I have a configuration file with "gems" set to "[jekyll_test_plugin]"
+    When I run jekyll
+    Then the _site directory should exist
+    And I should see "Whatever" in "_site/index.html"
+    And I should see "this is a test" in "_site/test.txt"

jekyll.gemspec

@@ -47,6 +47,7 @@ Gem::Specification.new do |s|
   s.add_development_dependency('simplecov-gem-adapter', "~> 1.0.1")
   s.add_development_dependency('coveralls', "~> 0.7.0")
   s.add_development_dependency('activesupport', '~> 3.2.13')
+  s.add_development_dependency('jekyll_test_plugin')
 
   # = MANIFEST =
   s.files = %w[

lib/jekyll/configuration.rb

@@ -12,6 +12,7 @@ class Configuration < Hash
       'layouts'       => '_layouts',
       'data_source'   =>  '_data',
       'keep_files'    => ['.git','.svn'],
+      'gems'          => [],
 
       'timezone'      => nil,           # use the local timezone
 
@@ -26,7 +27,7 @@ class Configuration < Hash
       'pygments'      => true,
 
       'relative_permalinks' => true,     # backwards-compatibility with < 1.0
-                                         # will be set to false once 1.1 hits
+                                         # will be set to false once 2.0 hits
 
       'markdown'      => 'maruku',
       'permalink'     => 'date',

lib/jekyll/site.rb

@@ -3,7 +3,7 @@ class Site
     attr_accessor :config, :layouts, :posts, :pages, :static_files,
                   :categories, :exclude, :include, :source, :dest, :lsi, :pygments,
                   :permalink_style, :tags, :time, :future, :safe, :plugins, :limit_posts,
-                  :show_drafts, :keep_files, :baseurl, :data, :file_read_opts
+                  :show_drafts, :keep_files, :baseurl, :data, :file_read_opts, :gems
 
     attr_accessor :converters, :generators
 
@@ -13,7 +13,7 @@ class Site
     def initialize(config)
       self.config          = config.clone
 
-      %w[safe lsi pygments baseurl exclude include future show_drafts limit_posts keep_files].each do |opt|
+      %w[safe lsi pygments baseurl exclude include future show_drafts limit_posts keep_files gems].each do |opt|
         self.send("#{opt}=", config[opt])
       end
 
@@ -77,6 +77,9 @@ def setup
               require f
             end
         end
+        self.gems.each do |gem|
+          require gem
+        end
       end
 
       self.converters = instantiate_subclasses(Jekyll::Converter)
@@ -391,7 +394,7 @@ def aggregate_post_info(post)
     def relative_permalinks_deprecation_method
       if config['relative_permalinks'] && !@deprecated_relative_permalinks
         $stderr.puts # Places newline after "Generating..."
-        Jekyll.logger.warn "Deprecation:", "Starting in 1.1, permalinks for pages" +
+        Jekyll.logger.warn "Deprecation:", "Starting in 2.0, permalinks for pages" +
                                             " in subfolders must be relative to the" +
                                             " site source directory, not the parent" +
                                             " directory. Check http://jekyllrb.com/docs/upgrading/"+

site/docs/upgrading.md

@@ -42,17 +42,17 @@ rebuild each time a file changes, just add the `--watch` flag at the end.
 ### Absolute Permalinks
 
 In Jekyll v1.0, we introduced absolute permalinks for pages in subdirectories.
-Until v1.1, it is **opt-in**. Starting with v1.1, however, absolute permalinks
+Until v2.0, it is **opt-in**. Starting with v2.0, however, absolute permalinks
 will become **opt-out**, meaning Jekyll will default to using absolute permalinks
 instead of relative permalinks.
 
 * To use absolute permalinks, set `relative_permalinks: false` in your configuration file.
 * To continue using relative permalinks, set `relative_permalinks: true` in your configuration file.
 
 <div class="note warning" id="absolute-permalinks-warning">
-  <h5 markdown="1">Absolute permalinks will be default in v1.1 and on</h5>
+  <h5 markdown="1">Absolute permalinks will be default in v2.0 and on</h5>
   <p markdown="1">
-    Starting with Jekyll v1.1.0, `relative_permalinks` will default to `false`,
+    Starting with Jekyll v2.0, `relative_permalinks` will default to `false`,
     meaning all pages will be built using the absolute permalink behaviour.
     The switch will still exist until v2.0.
   </p>