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import sys
from typing import Optional, TextIO
from prompt_toolkit.utils import is_windows
from .base import DummyInput, Input, PipeInput
__all__ = [
"create_input",
"create_pipe_input",
]
def create_input(
stdin: Optional[TextIO] = None, always_prefer_tty: bool = False
) -> Input:
"""
Create the appropriate `Input` object for the current os/environment.
:param always_prefer_tty: When set, if `sys.stdin` is connected to a Unix
`pipe`, check whether `sys.stdout` or `sys.stderr` are connected to a
pseudo terminal. If so, open the tty for reading instead of reading for
`sys.stdin`. (We can open `stdout` or `stderr` for reading, this is how
a `$PAGER` works.)
"""
if is_windows():
from .win32 import Win32Input
# If `stdin` was assigned `None` (which happens with pythonw.exe), use
# a `DummyInput`. This triggers `EOFError` in the application code.
if stdin is None and sys.stdin is None:
return DummyInput()
return Win32Input(stdin or sys.stdin)
else:
from .vt100 import Vt100Input
# If no input TextIO is given, use stdin/stdout.
if stdin is None:
stdin = sys.stdin
if always_prefer_tty:
for io in [sys.stdin, sys.stdout, sys.stderr]:
if io.isatty():
stdin = io
break
return Vt100Input(stdin)
def create_pipe_input() -> PipeInput:
"""
Create an input pipe.
This is mostly useful for unit testing.
"""
if is_windows():
from .win32_pipe import Win32PipeInput
return Win32PipeInput()
else:
from .posix_pipe import PosixPipeInput
return PosixPipeInput()
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