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fix(cli): sanitize surrogate characters in prompt history to prevent UnicodeEncodeError

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On Windows, certain Unicode input (emoji, mixed-script text, surrogate
pairs) causes prompt_toolkit's FileHistory to crash with
UnicodeEncodeError when writing the history file.

Fix: wrap FileHistory with a _SafeFileHistory subclass that sanitizes
surrogate characters before writing, replacing invalid sequences instead
of crashing.

Fixes #2846
This commit is contained in:
bahtya 2026-04-07 11:26:18 +08:00 committed by Xubin Ren
parent 67e6f8cc7a
commit 64bd7234b3
1 changed files with 10 additions and 1 deletions
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11
nanobot/cli/commands.py
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@ -118,8 +118,17 @@ def _init_prompt_session() -> None:
history_file = get_cli_history_path()
history_file.parent.mkdir(parents=True, exist_ok=True)
# Wrap FileHistory to sanitize surrogate characters on write.
# Without this, special Unicode input (emoji, mixed-script) crashes
# prompt_toolkit's history file write on Windows with UnicodeEncodeError.
# See issue #2846.
class _SafeFileHistory(FileHistory):
def store_string(self, string: str) -> None:
safe = string.encode("utf-8", errors="surrogateescape").decode("utf-8", errors="replace")
super().store_string(safe)
_PROMPT_SESSION = PromptSession(
history=FileHistory(str(history_file)),
history=_SafeFileHistory(str(history_file)),
enable_open_in_editor=False,
multiline=False, # Enter submits (single line mode)
)