[ruby/rdoc] Add autolink_excluded_words option to ignore

cross-references
(https://github.com/ruby/rdoc/pull/1259)

This config will be handy when the project name is the same as a class or
module name, which is often the case for most of the projects.

ce77f51f63

test/rdoc/test_rdoc_markup_to_html_crossref.rb

@@ -20,6 +20,9 @@ class RDocMarkupToHtmlCrossrefTest < XrefTestCase
     result = @to.convert '+C1+'
     assert_equal para("<a href=\"C1.html\"><code>C1</code></a>"), result
 
+    result = @to.convert 'Constant[rdoc-ref:C1]'
+    assert_equal para("<a href=\"C1.html\">Constant</a>"), result
+
     result = @to.convert 'FOO'
     assert_equal para("FOO"), result
 
@@ -30,6 +33,20 @@ class RDocMarkupToHtmlCrossrefTest < XrefTestCase
     assert_equal para("<code># :stopdoc:</code>:"), result
   end
 
+  def test_convert_CROSSREF_ignored_excluded_words
+    @options.autolink_excluded_words = ['C1']
+
+    result = @to.convert 'C1'
+    assert_equal para("C1"), result
+
+    result = @to.convert '+C1+'
+    assert_equal para("<a href=\"C1.html\"><code>C1</code></a>"), result
+
+    # Explicit linking with rdoc-ref is not ignored
+    result = @to.convert 'Constant[rdoc-ref:C1]'
+    assert_equal para("<a href=\"C1.html\">Constant</a>"), result
+  end
+
   def test_convert_CROSSREF_method
     result = @to.convert 'C1#m(foo, bar, baz)'