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from __future__ import annotations
import sys
assert sys.platform != "win32"
import os
from contextlib import contextmanager
from typing import ContextManager, Iterator, TextIO, cast
from ..utils import DummyContext
from .base import PipeInput
from .vt100 import Vt100Input
__all__ = [
"PosixPipeInput",
]
class _Pipe:
"Wrapper around os.pipe, that ensures we don't double close any end."
def __init__(self) -> None:
self.read_fd, self.write_fd = os.pipe()
self._read_closed = False
self._write_closed = False
def close_read(self) -> None:
"Close read-end if not yet closed."
if self._read_closed:
return
os.close(self.read_fd)
self._read_closed = True
def close_write(self) -> None:
"Close write-end if not yet closed."
if self._write_closed:
return
os.close(self.write_fd)
self._write_closed = True
def close(self) -> None:
"Close both read and write ends."
self.close_read()
self.close_write()
class PosixPipeInput(Vt100Input, PipeInput):
"""
Input that is send through a pipe.
This is useful if we want to send the input programmatically into the
application. Mostly useful for unit testing.
Usage::
with PosixPipeInput.create() as input:
input.send_text('inputdata')
"""
_id = 0
def __init__(self, _pipe: _Pipe, _text: str = "") -> None:
# Private constructor. Users should use the public `.create()` method.
self.pipe = _pipe
class Stdin:
encoding = "utf-8"
def isatty(stdin) -> bool:
return True
def fileno(stdin) -> int:
return self.pipe.read_fd
super().__init__(cast(TextIO, Stdin()))
self.send_text(_text)
# Identifier for every PipeInput for the hash.
self.__class__._id += 1
self._id = self.__class__._id
@classmethod
@contextmanager
def create(cls, text: str = "") -> Iterator[PosixPipeInput]:
pipe = _Pipe()
try:
yield PosixPipeInput(_pipe=pipe, _text=text)
finally:
pipe.close()
def send_bytes(self, data: bytes) -> None:
os.write(self.pipe.write_fd, data)
def send_text(self, data: str) -> None:
"Send text to the input."
os.write(self.pipe.write_fd, data.encode("utf-8"))
def raw_mode(self) -> ContextManager[None]:
return DummyContext()
def cooked_mode(self) -> ContextManager[None]:
return DummyContext()
def close(self) -> None:
"Close pipe fds."
# Only close the write-end of the pipe. This will unblock the reader
# callback (in vt100.py > _attached_input), which eventually will raise
# `EOFError`. If we'd also close the read-end, then the event loop
# won't wake up the corresponding callback because of this.
self.pipe.close_write()
def typeahead_hash(self) -> str:
"""
This needs to be unique for every `PipeInput`.
"""
return f"pipe-input-{self._id}"
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