Support a new relative_include tag

lib/jekyll/tags/include.rb

@@ -18,8 +18,6 @@ class IncludeTag < Liquid::Tag
       VALID_SYNTAX = /([\w-]+)\s*=\s*(?:"([^"\\]*(?:\\.[^"\\]*)*)"|'([^'\\]*(?:\\.[^'\\]*)*)'|([\w\.-]+))/
       VARIABLE_SYNTAX = /(?<variable>[^{]*\{\{\s*(?<name>[\w\-\.]+)\s*(\|.*)?\}\}[^\s}]*)(?<params>.*)/
 
-      INCLUDES_DIR = '_includes'
-
       def initialize(tag_name, markup, tokens)
         super
         matched = markup.strip.match(VARIABLE_SYNTAX)
@@ -96,8 +94,12 @@ def render_variable(context)
         end
       end
 
+      def includes_dir
+        '_includes'
+      end
+
       def render(context)
-        dir = File.join(File.realpath(context.registers[:site].source), INCLUDES_DIR)
+        dir = dir_to_include(context)
 
         file = render_variable(context) || @file
         validate_file_name(file)
@@ -113,10 +115,14 @@ def render(context)
             partial.render!(context)
           end
         rescue => e
-          raise IncludeTagError.new e.message, File.join(INCLUDES_DIR, @file)
+          raise IncludeTagError.new e.message, File.join(includes_dir, @file)
         end
       end
 
+      def dir_to_include(context)
+        File.join(File.realpath(context.registers[:site].source), includes_dir)
+      end
+
       def validate_path(path, dir, safe)
         if safe && !realpath_prefixed_with?(path, dir)
           raise IOError.new "The included file '#{path}' should exist and should not be a symlink"
@@ -126,7 +132,7 @@ def validate_path(path, dir, safe)
       end
 
       def path_relative_to_source(dir, path)
-        File.join(INCLUDES_DIR, path.sub(Regexp.new("^#{dir}"), ""))
+        File.join(includes_dir, path.sub(Regexp.new("^#{dir}"), ""))
       end
 
       def realpath_prefixed_with?(path, dir)
@@ -138,7 +144,19 @@ def source(file, context)
         File.read(file, file_read_opts(context))
       end
     end
+
+    class IncludeRelativeTag < IncludeTag
+      def includes_dir
+        '.'
+      end
+
+      def dir_to_include(context)
+        page_path = context.registers[:page].nil? ? includes_dir : File.dirname(context.registers[:page]["path"])
+        File.join(File.realpath(context.registers[:site].source), page_path)
+      end
+    end
   end
 end
 
 Liquid::Template.register_tag('include', Jekyll::Tags::IncludeTag)
+Liquid::Template.register_tag('include_relative', Jekyll::Tags::IncludeRelativeTag)

test/source/_posts/2014-09-02-relative-includes.markdown

@@ -0,0 +1,29 @@
+---
+title: Post
+layout: post
+include1: rel_include.html
+include2: include_relative/rel_include
+include3: rel_INCLUDE
+include4: params
+include5: clude
+---
+
+Liquid tests
+- 1 {% include_relative include_relative/{{ page.include1 }} %}
+- 2 {% include_relative {{ page.include2 | append: '.html' }} %}
+- 3 {% include_relative include_relative/{{ page.include3 | downcase | append: '.html' }} %}
+
+Whitespace tests
+- 4 {% include_relative include_relative/{{page.include1}} %}
+- 5 {% include_relative include_relative/{{   page.include1}} %}
+- 6 {% include_relative include_relative/{{  page.include3   | downcase |   append:  '.html'}} %}
+
+Parameters test
+- 7 {% include_relative include_relative/{{ page.include4 | append: '.html' }} var1='foo' var2='bar' %}
+
+Partial variable test
+- 8 {% include_relative include_relative/rel_in{{ page.include5 }}.html %}
+
+Relative to self test:
+
+- 9 {% include_relative 2014-03-03-yaml-with-dots.md %}

test/source/_posts/include_relative/params.html

@@ -0,0 +1,7 @@
+<span id='include-param'>{{include.param}}</span>
+
+<ul id='param-list'>
+  {% for param in include %}
+    <li>{{param[0]}} = {{param[1]}}</li>
+  {% endfor %}
+</ul>

test/source/_posts/include_relative/rel_include.html

@@ -0,0 +1 @@
+relative_included

test/test_generated_site.rb

@@ -14,7 +14,7 @@ class TestGeneratedSite < Test::Unit::TestCase
     end
 
     should "ensure post count is as expected" do
-      assert_equal 42, @site.posts.size
+      assert_equal 43, @site.posts.size
     end
 
     should "insert site.posts into the index" do

test/test_site.rb

@@ -48,7 +48,7 @@ class TestSite < Test::Unit::TestCase
         Jekyll::Configuration::DEFAULTS.merge({'source' => source_dir, 'destination' => dest_dir})
       end
       @site = Site.new(Jekyll.configuration)
-      @num_invalid_posts = 2
+      @num_invalid_posts = 4
     end
 
     should "have an empty tag hash by default" do

test/test_tags.rb

@@ -510,4 +510,98 @@ def fill_post(code, override = {})
       end
     end
   end
+
+  context "relative include tag with variable and liquid filters" do
+    setup do
+      stub(Jekyll).configuration do
+        site_configuration({'pygments' => true})
+      end
+
+      site = Site.new(Jekyll.configuration)
+      post = Post.new(site, source_dir, '', "2014-09-02-relative-includes.markdown")
+      layouts = { "default" => Layout.new(site, source_dir('_layouts'), "simple.html")}
+      post.render(layouts, {"site" => {"posts" => []}})
+      @content = post.content
+    end
+
+    should "include file as variable with liquid filters" do
+      assert_match %r{1 relative_include}, @content
+      assert_match %r{2 relative_include}, @content
+      assert_match %r{3 relative_include}, @content
+    end
+
+    should "include file as variable and liquid filters with arbitrary whitespace" do
+      assert_match %r{4 relative_include}, @content
+      assert_match %r{5 relative_include}, @content
+      assert_match %r{6 relative_include}, @content
+    end
+
+    should "include file as variable and filters with additional parameters" do
+      assert_match '<li>var1 = foo</li>', @content
+      assert_match '<li>var2 = bar</li>', @content
+    end
+
+    should "include file as partial variable" do
+      assert_match %r{8 relative_include}, @content
+    end
+
+    should "include files relative to self" do
+      assert_match %r{9 —\ntitle: Test Post Where YAML}, @content
+    end
+
+    context "trying to do bad stuff" do
+      context "include missing file" do
+        setup do
+          @content = <<CONTENT
+---
+title: missing file
+---
+
+{% include_relative missing.html %}
+CONTENT
+        end
+
+        should "raise error relative to source directory" do
+          exception = assert_raise IOError do
+            create_post(@content, {'permalink' => 'pretty', 'source' => source_dir, 'destination' => dest_dir, 'read_posts' => true})
+          end
+          assert_equal 'Included file \'./missing.html\' not found', exception.message
+        end
+      end
+    end
+
+    context "with symlink'd include" do
+
+      should "not allow symlink includes" do
+        File.open("/tmp/pages-test", 'w') { |file| file.write("SYMLINK TEST") }
+        assert_raise IOError do
+          content = <<CONTENT
+---
+title: Include symlink
+---
+
+{% include_relative tmp/pages-test %}
+
+CONTENT
+          create_post(content, {'permalink' => 'pretty', 'source' => source_dir, 'destination' => dest_dir, 'read_posts' => true, 'safe' => true })
+        end
+        assert_no_match /SYMLINK TEST/, @result
+      end
+
+      should "not expose the existence of symlinked files" do
+        ex = assert_raise IOError do
+          content = <<CONTENT
+---
+title: Include symlink
+---
+
+{% include_relative tmp/pages-test-does-not-exist %}
+
+CONTENT
+          create_post(content, {'permalink' => 'pretty', 'source' => source_dir, 'destination' => dest_dir, 'read_posts' => true, 'safe' => true })
+        end
+        assert_match /should exist and should not be a symlink/, ex.message
+      end
+    end
+  end
 end