Merge branch 'pathawks-fp/ExcerptDrop'

* pathawks-fp/ExcerptDrop:
  Rubocop fixes
  excerpt drop should give access to document's layout
  look up the content methods for drops in a smarter way
  Use require_relative
  Add ExcerptDrop and remove excerpt's ability to refer to itself in Liquid

lib/jekyll/drops/drop.rb

@@ -3,7 +3,7 @@
 module Jekyll
   module Drops
     class Drop < Liquid::Drop
-      NON_CONTENT_METHODS = [:[], :[]=, :inspect, :to_h, :fallback_data].freeze
+      NON_CONTENT_METHODS = [:fallback_data].freeze
 
       # Get or set whether the drop class is mutable.
       # Mutability determines whether or not pre-defined fields may be
@@ -86,7 +86,7 @@ module Jekyll
       # Returns an Array of strings which represent method-specific keys.
       def content_methods
         @content_methods ||= (
-          self.class.instance_methods(false) - NON_CONTENT_METHODS
+          self.class.instance_methods - Jekyll::Drops::Drop.instance_methods - NON_CONTENT_METHODS
         ).map(&:to_s).reject do |method|
           method.end_with?("=")
         end

lib/jekyll/drops/excerpt_drop.rb

@@ -0,0 +1,15 @@
+# encoding: UTF-8
+
+module Jekyll
+  module Drops
+    class ExcerptDrop < DocumentDrop
+      def layout
+        @obj.doc.data["layout"]
+      end
+
+      def excerpt
+        nil
+      end
+    end
+  end
+end

lib/jekyll/excerpt.rb

@@ -7,7 +7,7 @@ module Jekyll
     attr_writer   :output
 
     def_delegators :@doc, :site, :name, :ext, :relative_path, :extname,
-                          :render_with_liquid?, :collection, :related_posts
+                          :render_with_liquid?, :collection, :related_posts, :url
 
     # Initialize this Excerpt instance.
     #
@@ -59,10 +59,7 @@ module Jekyll
     end
 
     def to_liquid
-      doc.data["excerpt"] = nil
-      @to_liquid ||= doc.to_liquid
-      doc.data["excerpt"] = self
-      @to_liquid
+      Jekyll::Drops::ExcerptDrop.new(self)
     end
 
     # Returns the shorthand String identifier of this doc.

test/helper.rb

@@ -28,7 +28,7 @@ require "minitest/autorun"
 require "minitest/reporters"
 require "minitest/profile"
 require "rspec/mocks"
-require "jekyll"
+require_relative "../lib/jekyll.rb"
 
 Jekyll.logger = Logger.new(StringIO.new)
 

test/test_excerpt_drop.rb

@@ -0,0 +1,36 @@
+require "helper"
+
+class TestExcerptDrop < JekyllUnitTest
+  context "an excerpt drop" do
+    setup do
+      @site = fixture_site
+      @site.read
+      @doc = @site.docs_to_write.find { |d| !d.data["layout"].nil? }
+      @doc_drop = @doc.to_liquid
+      @excerpt = @doc.data["excerpt"]
+      @excerpt_drop = @excerpt.to_liquid
+    end
+
+    should "have the right thing" do
+      assert @doc.is_a? Jekyll::Document
+      assert @doc_drop.is_a? Jekyll::Drops::DocumentDrop
+      assert @excerpt.is_a? Jekyll::Excerpt
+      assert @excerpt_drop.is_a? Jekyll::Drops::ExcerptDrop
+    end
+
+    should "not have an excerpt" do
+      assert_nil @excerpt.data["excerpt"]
+      assert @excerpt_drop.class.invokable? "excerpt"
+      assert_nil @excerpt_drop["excerpt"]
+    end
+
+    should "inherit the layout for the drop but not the excerpt" do
+      assert_nil @excerpt.data["layout"]
+      assert_equal @excerpt_drop["layout"], @doc_drop["layout"]
+    end
+
+    should "inherit values from the document" do
+      assert_equal @excerpt_drop.keys.sort, @doc_drop.keys.sort
+    end
+  end
+end