Merge pull request #4624 from jeffkole/feature/add-collection-url-tag

Merge pull request 4624

lib/jekyll/tags/link.rb

@@ -0,0 +1,26 @@
+module Jekyll
+  module Tags
+    class Link < Liquid::Tag
+      TagName = 'link'
+
+      def initialize(tag_name, relative_path, tokens)
+        super
+
+        @relative_path = relative_path.strip
+      end
+
+      def render(context)
+        site = context.registers[:site]
+
+        site.docs_to_write.each do |document|
+          return document.url if document.relative_path == @relative_path
+        end
+
+        raise ArgumentError, "Could not find document '#{@relative_path}' in tag '#{TagName}'.\n\n" \
+          "Make sure the document exists and the path is correct."
+      end
+    end
+  end
+end
+
+Liquid::Template.register_tag(Jekyll::Tags::Link::TagName, Jekyll::Tags::Link)

test/test_tags.rb

@@ -11,9 +11,8 @@ class TestTags < JekyllUnitTest
   def create_post(content, override = {}, converter_class = Jekyll::Converters::Markdown)
     site = fixture_site({"highlighter" => "rouge"}.merge(override))
 
-    if override['read_posts']
-      site.posts.docs.concat(PostReader.new(site).read_posts(''))
-    end
+    site.posts.docs.concat(PostReader.new(site).read_posts('')) if override['read_posts']
+    CollectionReader.new(site).read if override['read_collections']
 
     info = { :filters => [Jekyll::Filters], :registers => { :site => site } }
     @converter = site.converters.find { |c| c.class == converter_class }
@@ -521,6 +520,69 @@ CONTENT
     end
   end
 
+  context "simple page with linking" do
+    setup do
+      content = <<CONTENT
+---
+title: linking
+---
+
+{% link _methods/yaml_with_dots.md %}
+CONTENT
+      create_post(content, {'source' => source_dir, 'destination' => dest_dir, 'collections' => { 'methods' => { 'output' => true }}, 'read_collections' => true})
+    end
+
+    should "not cause an error" do
+      refute_match /markdown\-html\-error/, @result
+    end
+
+    should "have the url to the \"yaml_with_dots\" item" do
+      assert_match %r{/methods/yaml_with_dots\.html}, @result
+    end
+  end
+
+  context "simple page with nested linking" do
+    setup do
+      content = <<CONTENT
+---
+title: linking
+---
+
+- 1 {% link _methods/sanitized_path.md %}
+- 2 {% link _methods/site/generate.md %}
+CONTENT
+      create_post(content, {'source' => source_dir, 'destination' => dest_dir, 'collections' => { 'methods' => { 'output' => true }}, 'read_collections' => true})
+    end
+
+    should "not cause an error" do
+      refute_match /markdown\-html\-error/, @result
+    end
+
+    should "have the url to the \"sanitized_path\" item" do
+      assert_match %r{1\s/methods/sanitized_path\.html}, @result
+    end
+
+    should "have the url to the \"site/generate\" item" do
+      assert_match %r{2\s/methods/site/generate\.html}, @result
+    end
+  end
+
+  context "simple page with invalid linking" do
+    should "cause an error" do
+      content = <<CONTENT
+---
+title: Invalid linking
+---
+
+{% link non-existent-collection-item %}
+CONTENT
+
+      assert_raises ArgumentError do
+        create_post(content, {'source' => source_dir, 'destination' => dest_dir, 'collections' => { 'methods' => { 'output' => true }}, 'read_collections' => true})
+      end
+    end
+  end
+
   context "include tag with parameters" do
 
     context "with symlink'd include" do