Document: only superdirectories of the collection are categories

features/post_data.feature

@@ -187,6 +187,24 @@ Feature: Post data
     Then the _site directory should exist
     And I should see "Post category: movies" in "_site/movies/2009/03/27/star-wars.html"
 
+  Scenario: Superdirectories of _posts applied to post.categories
+    Given I have a movies/_posts directory
+    And I have a "movies/_posts/2009-03-27-star-wars.html" page with layout "simple" that contains "hi"
+    And I have a _layouts directory
+    And I have a simple layout that contains "Post category: {{ page.categories }}"
+    When I run jekyll build
+    Then the _site directory should exist
+    And I should see "Post category: movies" in "_site/movies/2009/03/27/star-wars.html"
+
+  Scenario: Subdirectories of _posts not applied to post.categories
+    Given I have a movies/_posts/scifi directory
+    And I have a "movies/_posts/scifi/2009-03-27-star-wars.html" page with layout "simple" that contains "hi"
+    And I have a _layouts directory
+    And I have a simple layout that contains "Post category: {{ page.categories }}"
+    When I run jekyll build
+    Then the _site directory should exist
+    And I should see "Post category: movies" in "_site/movies/2009/03/27/star-wars.html"
+
   Scenario: Use post.categories variable when categories are in YAML with mixed case
     Given I have a _posts directory
     And I have a _layouts directory

lib/jekyll/document.rb

@@ -24,10 +24,11 @@ module Jekyll
       @collection = relations[:collection]
       @has_yaml_header = nil
 
-      subdirs = relative_path.split(File::SEPARATOR).reject do |c|
-        c.empty? || c.eql?(collection.relative_directory) || c.eql?("_drafts") || c.eql?(basename)
+      if draft?
+        categories_from_path("_drafts")
+      else
+        categories_from_path(collection.relative_directory)
       end
-      merge_data!({'categories' => subdirs })
 
       data.default_proc = proc do |hash, key|
         site.frontmatter_defaults.find(relative_path, collection.label, key)
@@ -75,6 +76,15 @@ module Jekyll
       data['date'] ||= site.time
     end
 
+    # Returns whether the document is a draft. This is only the case if
+    # the document is in the 'posts' collection but in a different
+    # directory than '_posts'.
+    #
+    # Returns whether the document is a draft.
+    def draft?
+      data['draft'] ||= relative_path.index(collection.relative_directory).nil? && collection.label == "posts"
+    end
+
     # The path to the document, relative to the site source.
     #
     # Returns a String path which represents the relative path
@@ -311,9 +321,21 @@ module Jekyll
       end
     end
 
+    # Add superdirectories of the special_dir to categories.
+    # In the case of es/_posts, 'es' is added as a category.
+    # In the case of _posts/es, 'es' is NOT added as a category.
+    #
+    # Returns nothing.
+    def categories_from_path(special_dir)
+      superdirs = relative_path.sub(/#{special_dir}(.*)/, '').split(File::SEPARATOR).reject do |c|
+        c.empty? || c.eql?(special_dir) || c.eql?(basename)
+      end
+      merge_data!({ 'categories' => superdirs })
+    end
+
     def populate_categories
       merge_data!({
-        "categories" => (
+        'categories' => (
           Array(data['categories']) + Utils.pluralized_array_from_hash(data, 'category', 'categories')
         ).map { |c| c.to_s }.flatten.uniq
       })

test/test_site.rb

@@ -220,7 +220,7 @@ class TestSite < JekyllUnitTest
 
       posts = Dir[source_dir("**", "_posts", "**", "*")]
       posts.delete_if { |post| File.directory?(post) && !(post =~ Document::DATE_FILENAME_MATCHER) }
-      categories = %w(2013 bar baz category foo z_category MixedCase Mixedcase es publish_test win).sort
+      categories = %w(2013 bar baz category foo z_category MixedCase Mixedcase publish_test win).sort
 
       assert_equal posts.size - @num_invalid_posts, @site.posts.size
       assert_equal categories, @site.categories.keys.sort

test/test_tags.rb

@@ -455,8 +455,8 @@ CONTENT
     end
 
     should "have the url to the \"nested\" post from 2008-11-21" do
-      assert_match %r{3\s/es/2008/11/21/nested/}, @result
-      assert_match %r{4\s/es/2008/11/21/nested/}, @result
+      assert_match %r{3\s/2008/11/21/nested/}, @result
+      assert_match %r{4\s/2008/11/21/nested/}, @result
     end
   end