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gh-123177: Fix prompt for wrapped lines in pyrepl (#123324)

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When display lines above the cursor come from the cache, the first line
to not come from the cache may be a wrapped line, starting half way
through a logical line in the buffer. Detect and handle this case to
avoid accidentally drawing a stray prompt in the middle of a logical
line.
This commit is contained in:
Matt Wozniski 2024-08-25 18:54:06 -04:00 • committed by GitHub
parent 70bfef52b5
commit 602fcf97df
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3 changed files with 42 additions and 1 deletions
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10
Lib/_pyrepl/reader.py
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@ -345,7 +345,10 @@ class Reader:
pos = self.pos
pos -= offset
prompt_from_cache = (offset and self.buffer[offset - 1] != "\n")
lines = "".join(self.buffer[offset:]).split("\n")
cursor_found = False
lines_beyond_cursor = 0
for ln, line in enumerate(lines, num_common_lines):
@ -359,7 +362,12 @@ class Reader:
# No need to keep formatting lines.
# The console can't show them.
break
prompt = self.get_prompt(ln, ll >= pos >= 0)
if prompt_from_cache:
# Only the first line's prompt can come from the cache
prompt_from_cache = False
prompt = ""
else:
prompt = self.get_prompt(ln, ll >= pos >= 0)
while "\n" in prompt:
pre_prompt, _, prompt = prompt.partition("\n")
last_refresh_line_end_offsets.append(offset)