Remove :main: and :title: directives

These directives have been deprecated since RDoc 6. The same
functionality is available via --main/--title CLI options,
RDoc::Task attributes, and .rdoc_options.

Author: st0012

lib/rdoc/markup/pre_process.rb

@@ -209,18 +209,6 @@ def handle_directive(prefix, directive, param, code_object = nil,
     when 'include' then
       filename = param.split(' ', 2).first
       include_file filename, prefix, encoding
-    when 'main' then
-      @options.main_page = param if @options.respond_to? :main_page
-      warn <<~MSG
-        The :main: directive is deprecated and will be removed in RDoc 7.
-
-        You can use these options to specify the initial page displayed instead:
-        - `--main=#{param}` via the command line
-        - `rdoc.main = "#{param}"` if you use `RDoc::Task`
-        - `main_page: #{param}` in your `.rdoc_options` file
-      MSG
-
-      blankline
     when 'nodoc' then
       return blankline unless code_object
       code_object.document_self = nil # notify nodoc
@@ -245,19 +233,6 @@ def handle_directive(prefix, directive, param, code_object = nil,
 
       code_object.stop_doc
 
-      blankline
-    when 'title' then
-      @options.default_title = param if @options.respond_to? :default_title=
-
-      warn <<~MSG
-        The :title: directive is deprecated and will be removed in RDoc 7.
-
-        You can use these options to specify the title displayed instead:
-        - `--title=#{param}` via the command line
-        - `rdoc.title = "#{param}"` if you use `RDoc::Task`
-        - `title: #{param}` in your `.rdoc_options` file
-      MSG
-
       blankline
     when 'yield', 'yields' then
       return blankline unless code_object

test/rdoc/markup/pre_process_test.rb

@@ -84,26 +84,20 @@ def test_include_file_in_other_directory
   end
 
   def test_handle
-    text = "# :main: M\n"
-    output = nil
-    _, err = capture_output do
-      output = @pp.handle text
-    end
+    text = "# :stopdoc:\n"
+    code_object = RDoc::CodeObject.new
+    output = @pp.handle text, code_object
 
-    assert_include err, "The :main: directive is deprecated and will be removed in RDoc 7."
     assert_equal "#\n", output
   end
 
   def test_handle_comment
-    text = "# :main: M\n"
+    text = "# :stopdoc:\n"
     c = comment text
+    code_object = RDoc::CodeObject.new
 
-    output = nil
-    _, err = capture_output do
-      output = @pp.handle c
-    end
+    output = @pp.handle c, code_object
 
-    assert_include err, "The :main: directive is deprecated and will be removed in RDoc 7."
     assert_equal "#\n", output
   end
 
@@ -253,12 +247,11 @@ def test_handle_directive_include
   def test_handle_directive_main
     @pp.options = RDoc::Options.new
 
-    _, err = capture_output do
-      @pp.handle_directive '', 'main', 'M'
-    end
+    # :main: directive was removed; it is now treated as unhandled metadata
+    code_object = RDoc::CodeObject.new
+    @pp.handle_directive '', 'main', 'M', code_object
 
-    assert_include err, "The :main: directive is deprecated and will be removed in RDoc 7."
-    assert_equal 'M', @pp.options.main_page
+    assert_equal 'M', code_object.metadata['main']
   end
 
   def test_handle_directive_notnew
@@ -396,12 +389,11 @@ def test_handle_directive_stopdoc
   def test_handle_directive_title
     @pp.options = RDoc::Options.new
 
-    _, err = capture_output do
-      @pp.handle_directive '', 'title', 'T'
-    end
+    # :title: directive was removed; it is now treated as unhandled metadata
+    code_object = RDoc::CodeObject.new
+    @pp.handle_directive '', 'title', 'T', code_object
 
-    assert_include err, "The :title: directive is deprecated and will be removed in RDoc 7."
-    assert_equal 'T', @pp.options.title
+    assert_equal 'T', code_object.metadata['title']
   end
 
   def test_handle_directive_unhandled