Merge pull request #1841 from jens-na/include-variable-liquid-filters

features/include_tag.feature

@@ -55,3 +55,14 @@ Feature: Include tags
     When I run jekyll
     Then the _site directory should exist
     And I should see "one two" in "_site/index.html"
+
+  Scenario: Include a file with variables and filters
+    Given I have an _includes directory
+    And I have an "_includes/one.html" file that contains "one included"
+    And I have a configuration file with:
+    | key          | value |
+    | include_file | one   |
+    And I have an "index.html" page that contains "{% include {{ site.include_file | append: '.html' }} %}"
+    When I run jekyll
+    Then the _site directory should exist
+    And I should see "one included" in "_site/index.html"

lib/jekyll/tags/include.rb

@@ -14,12 +14,19 @@ module Jekyll
       SYNTAX_EXAMPLE = "{% include file.ext param='value' param2='value' %}"
 
       VALID_SYNTAX = /([\w-]+)\s*=\s*(?:"([^"\\]*(?:\\.[^"\\]*)*)"|'([^'\\]*(?:\\.[^'\\]*)*)'|([\w\.-]+))/
+      VARIABLE_SYNTAX = /(?<variable>\{\{\s*(?<name>[\w\-\.]+)\s*(\|.*)?\}\})(?<params>.*)/
 
       INCLUDES_DIR = '_includes'
 
       def initialize(tag_name, markup, tokens)
         super
+        matched = markup.strip.match(VARIABLE_SYNTAX)
+        if matched
+          @file = matched['variable'].strip
+          @params = matched['params'].strip
+        else
           @file, @params = markup.strip.split(' ', 2);
+        end
         validate_params if @params
       end
 
@@ -48,7 +55,7 @@ module Jekyll
             raise ArgumentError.new <<-eos
 Invalid syntax for include tag. File contains invalid characters or sequences:
 
-	#{@file}
+	#{file}
 
 Valid syntax:
 
@@ -79,10 +86,11 @@ eos
         context.registers[:site].file_read_opts
       end
 
-      def retrieve_variable(context)
-        if /\{\{([\w\-\.]+)\}\}/ =~ @file
-          raise ArgumentError.new("No variable #{$1} was found in include tag") if context[$1].nil?
-          context[$1]
+      # Render the variable if required
+      def render_variable(context)
+        if @file.match(VARIABLE_SYNTAX)
+          partial = Liquid::Template.parse(@file)
+          partial.render!(context)
         end
       end
 
@@ -90,7 +98,7 @@ eos
         dir = File.join(context.registers[:site].source, INCLUDES_DIR)
         validate_dir(dir, context.registers[:site].safe)
 
-        file = retrieve_variable(context) || @file
+        file = render_variable(context) || @file
         validate_file_name(file)
 
         path = File.join(dir, file)
@@ -116,9 +124,9 @@ eos
 
       def validate_file(file, safe)
         if !File.exists?(file)
-          raise IOError.new "Included file '#{@file}' not found in '#{INCLUDES_DIR}' directory"
+          raise IOError.new "Included file '#{file}' not found" 
         elsif File.symlink?(file) && safe
-          raise IOError.new "The included file '#{INCLUDES_DIR}/#{@file}' should not be a symlink"
+          raise IOError.new "The included file '#{file}' should not be a symlink"
         end
       end
 

site/docs/templates.md

@@ -209,9 +209,7 @@ root of your source directory. This will embed the contents of
 
     The name of the file you wish to embed can be literal (as in the example above),
     or you can use a variable, using liquid-like variable syntax as in
-    <code>{% raw %}{% include {{my_variable}} %}{% endraw %}</code>.
-
-    Note that unlike usual liquid variable syntax, you cannot have spaces inside the curly braces.
+    <code>{% raw %}{% include {{ my_variable }} %}{% endraw %}</code>.
 
   </p>
 </div>

test/source/_includes/include.html

@@ -0,0 +1 @@
+included

test/source/_posts/2013-12-17-include-variable-filters.markdown

@@ -0,0 +1,21 @@
+---
+title: Post
+layout: post
+include1: include.html
+include2: include
+include3: INCLUDE
+include4: params
+---
+
+Liquid tests
+- 1 {% include {{ page.include1 }} %}
+- 2 {% include {{ page.include2 | append: '.html' }} %}
+- 3 {% include {{ page.include3 | downcase | append: '.html' }} %}
+
+Whitespace tests
+- 4 {% include {{page.include1}} %}
+- 5 {% include {{   page.include1}} %}
+- 6 {% include {{  page.include3   | downcase |   append:  '.html'}} %}
+
+Parameters test
+- 7 {% include {{ page.include4 | append: '.html' }} var1='foo' var2='bar' %}

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 36, @site.posts.size
+      assert_equal 37, @site.posts.size
     end
 
     should "insert site.posts into the index" do

test/test_tags.rb

@@ -471,5 +471,35 @@ CONTENT
       end
     end
 
+    context "include tag with variable and liquid filters" do
+      setup do
+        stub(Jekyll).configuration do
+          Jekyll::Configuration::DEFAULTS.deep_merge({'pygments' => true}).deep_merge({'source' => source_dir, 'destination' => dest_dir})
+        end
+
+        site = Site.new(Jekyll.configuration)
+        post = Post.new(site, source_dir, '', "2013-12-17-include-variable-filters.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 included}, @content
+        assert_match %r{2 included}, @content
+        assert_match %r{3 included}, @content
+      end
+
+      should "include file as variable and liquid filters with arbitrary whitespace" do
+        assert_match %r{4 included}, @content
+        assert_match %r{5 included}, @content
+        assert_match %r{6 included}, @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
+    end
   end
 end