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from __future__ import annotations
from dataclasses import dataclass, field
import traceback
TYPE_CHECKING = False
if TYPE_CHECKING:
from threading import Thread
from types import TracebackType
from typing import Protocol
class ExceptHookArgs(Protocol):
@property
def exc_type(self) -> type[BaseException]: ...
@property
def exc_value(self) -> BaseException | None: ...
@property
def exc_traceback(self) -> TracebackType | None: ...
@property
def thread(self) -> Thread | None: ...
class ShowExceptions(Protocol):
def __call__(self) -> int: ...
def add(self, s: str) -> None: ...
from .reader import Reader
def install_threading_hook(reader: Reader) -> None:
import threading
@dataclass
class ExceptHookHandler:
lock: threading.Lock = field(default_factory=threading.Lock)
messages: list[str] = field(default_factory=list)
def show(self) -> int:
count = 0
with self.lock:
if not self.messages:
return 0
reader.restore()
for tb in self.messages:
count += 1
if tb:
print(tb)
self.messages.clear()
reader.scheduled_commands.append("ctrl-c")
reader.prepare()
return count
def add(self, s: str) -> None:
with self.lock:
self.messages.append(s)
def exception(self, args: ExceptHookArgs) -> None:
lines = traceback.format_exception(
args.exc_type,
args.exc_value,
args.exc_traceback,
colorize=reader.can_colorize,
) # type: ignore[call-overload]
pre = f"\nException in {args.thread.name}:\n" if args.thread else "\n"
tb = pre + "".join(lines)
self.add(tb)
def __call__(self) -> int:
return self.show()
handler = ExceptHookHandler()
reader.threading_hook = handler
threading.excepthook = handler.exception