[ruby/reline] Escape newline(s) in prompt

b545459fca

lib/reline/line_editor.rb

@@ -260,7 +260,7 @@ class Reline::LineEditor
   end
 
   def reset_variables(prompt = '', encoding:)
-    @prompt = prompt
+    @prompt = prompt.gsub("\n", "\\n")
     @mark_pointer = nil
     @encoding = encoding
     @is_multiline = false

test/reline/yamatanooroti/test_rendering.rb

@@ -1228,6 +1228,19 @@ begin
       EOC
     end
 
+    def test_prompt_with_newline
+      ENV['RELINE_TEST_PROMPT'] = "::\n> "
+      start_terminal(5, 30, %W{ruby -I#{@pwd}/lib #{@pwd}/test/reline/yamatanooroti/multiline_repl}, startup_message: 'Multiline REPL.')
+      write("def hoge\n  3\nend")
+      close
+      assert_screen(<<~'EOC')
+        Multiline REPL.
+        ::\n> def hoge
+        ::\n>   3
+        ::\n> end
+      EOC
+    end
+
     def write_inputrc(content)
       File.open(@inputrc_file, 'w') do |f|
         f.write content