gh-121499: Fix multi-line history rendering in the REPL (#121531)

Signed-off-by: Pablo Galindo <pablogsal@gmail.com>

1 files changed, 14 insertions, 0 deletions

diff --git a/Lib/test/test_pyrepl/support.py b/Lib/test/test_pyrepl/support.py
index 70e1228..58b1a92 100644
--- a/Lib/test/test_pyrepl/support.py
+++ b/Lib/test/test_pyrepl/support.py
@@ -38,6 +38,20 @@ def code_to_events(code: str):
         yield Event(evt="key", data=c, raw=bytearray(c.encode("utf-8")))
 
 
+def clean_screen(screen: Iterable[str]):
+    """Cleans color and console characters out of a screen output.
+
+    This is useful for screen testing, it increases the test readability since
+    it strips out all the unreadable side of the screen.
+    """
+    output = []
+    for line in screen:
+        if line.startswith(">>>") or line.startswith("..."):
+            line = line[3:]
+        output.append(line)
+    return "\n".join(output).strip()
+
+
 def prepare_reader(console: Console, **kwargs):
     config = ReadlineConfig(readline_completer=kwargs.pop("readline_completer", None))
     reader = ReadlineAlikeReader(console=console, config=config)