Implement show-all-if-ambiguous feature

Author: ima1zumi

lib/reline/line_editor.rb

@@ -880,6 +880,7 @@ def editing_mode
  @perfect_matched = completed
  else
  @completion_state = CompletionState::MENU
+ complete(list, just_show_list) if @config.show_all_if_ambiguous
  end
  if not just_show_list and target < completed
  @buffer_of_lines[@line_index] = (preposing + completed + completion_append_character.to_s + postposing).split("\n")[@line_index] || String.new(encoding: @encoding)

test/reline/yamatanooroti/test_rendering.rb

@@ -991,6 +991,33 @@ def test_completion_journey_with_empty_line
  EOC
  end
 
+ def test_completion_menu_is_displayed_horizontally
+ start_terminal(20, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --complete}, startup_message: 'Multiline REPL.')
+ write("S\t\t")
+ close
+ assert_screen(<<~'EOC')
+ Multiline REPL.
+ prompt> S
+ ScriptError String
+ Signal SyntaxError
+ EOC
+ end
+
+ def test_show_all_if_ambiguous_on
+ write_inputrc <<~LINES
+ set show-all-if-ambiguous on
+ LINES
+ start_terminal(20, 50, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl --complete}, startup_message: 'Multiline REPL.')
+ write("S\t")
+ close
+ assert_screen(<<~'EOC')
+ Multiline REPL.
+ prompt> S
+ ScriptError String
+ Signal SyntaxError
+ EOC
+ end
+
  def test_simple_dialog
  iterate_over_face_configs do |config_name, config_file|
  start_terminal(20, 50, %W{ruby -I#{@pwd}/lib -r#{config_file.path} #{@pwd}/test/reline/yamatanooroti/multiline_repl --dialog simple}, startup_message: 'Multiline REPL.')