Fix page links returning 404 in server mode

`TopLevel#parser=` was calling `update_parser_of_file` with
`absolute_name`, but `@files_hash` is keyed by `relative_name`.
The lookup always failed, so `@text_files_hash` was never populated
and `find_text_page` always returned nil.

Author: st0012

lib/rdoc/code_object/top_level.rb

@@ -66,7 +66,7 @@ def initialize(absolute_name, relative_name = absolute_name)
 
   def parser=(val)
     @parser = val
-    @store.update_parser_of_file(absolute_name, val) if @store
+    @store.update_parser_of_file(relative_name, val) if @store
     @parser
   end
 

lib/rdoc/store.rb

@@ -321,11 +321,11 @@ def resolve_c_superclasses
   end
 
   ##
-  # Sets the parser of +absolute_name+, unless it from a source code file.
+  # Sets the parser of +relative_name+, unless it from a source code file.
 
-  def update_parser_of_file(absolute_name, parser)
-    if top_level = @files_hash[absolute_name] then
-      @text_files_hash[absolute_name] = top_level if top_level.text?
+  def update_parser_of_file(relative_name, parser)
+    if top_level = @files_hash[relative_name] then
+      @text_files_hash[relative_name] = top_level if top_level.text?
     end
   end
 

test/rdoc/rdoc_store_test.rb

@@ -348,6 +348,13 @@ def test_find_text_page
     assert_equal page, @store.find_text_page('PAGE.txt')
   end
 
+  def test_find_text_page_when_parser_set_after_add_file
+    page = @store.add_file '/absolute/path/to/PAGE.md', relative_name: 'PAGE.md'
+    page.parser = RDoc::Parser::Simple
+
+    assert_equal page, @store.find_text_page('PAGE.md')
+  end
+
   def test_friendly_path
     @orig_xdg_data_home = ENV.delete('XDG_DATA_HOME')