Set template encoding correctly

When partials for templates were created the encoding of the output was
not properly set.  This would lead to encoding errors when invalid
characters where generated while writing to the main page.

Now the template source is transcoded to the output encoding which
allows the template result encoding to be correct.

This issue resisted efforts to write a proper test-case.

Fixes #183

History.rdoc

@@ -1,4 +1,4 @@
-=== 4.0.0.rc.2 / 2013-02-05
+=== 4.0.0.rc.2.1
 
 As a preview release, please file bugs for any problems you have with rdoc at
 https://github.com/rdoc/rdoc/issues
@@ -10,6 +10,12 @@ Notable feature additions are markdown support and an WEBrick servlet that can
 serve HTML from an ri store.  (This means that RubyGems 2.0+ no longer needs
 to build HTML documentation when installing gems.)
 
+* Bug fix
+  * Templates now use the correct encoding when generating pages.  Issue #183
+    by Vít Ondruch
+
+=== 4.0.0.rc.2 / 2013-02-05
+
 * Minor enhancements
   * Added current heading and page-top links to HTML headings.
 

lib/rdoc.rb

@@ -64,7 +64,7 @@ class Error < RuntimeError; end
   ##
   # RDoc version you are using
 
-  VERSION = '4.0.0.rc.2'
+  VERSION = '4.0.0.rc.2.1'
 
   ##
   # Method visibilities

lib/rdoc/generator/darkfish.rb

@@ -698,18 +698,17 @@ def template_for file, page = true, klass = ERB
 
     return template if template
 
-    template = if page then
-                 assemble_template file
-               else
-                 file.read
-               end
-
-    erbout = if page then
-               'io'
-             else
-               file_var = File.basename(file).sub(/\..*/, '')
-               "_erbout_#{file_var}"
-             end
+    if page then
+      template = assemble_template file
+      erbout = 'io'
+    else
+      template = file.read
+      template = template.encode @options.encoding
+
+      file_var = File.basename(file).sub(/\..*/, '')
+
+      erbout = "_erbout_#{file_var}"
+    end
 
     template = klass.new template, nil, '<>', erbout
     @template_cache[file] = template

test/test_rdoc_generator_darkfish.rb

@@ -173,5 +173,15 @@ def test_template_for_dry_run
     assert_same template, @g.send(:template_for, classpage)
   end
 
+  def test_template_for_partial
+    partial = Pathname.new @options.template_dir + '_sidebar_classes.rhtml'
+
+    template = @g.send(:template_for, partial, false, RDoc::ERBPartial)
+
+    assert_kind_of RDoc::ERBPartial, template
+
+    assert_same template, @g.send(:template_for, partial)
+  end
+
 end