# Copyright 2000-2004 Michael Hudson-Doyle <micahel@gmail.com>
#
# All Rights Reserved
#
#
# Permission to use, copy, modify, and distribute this software and
# its documentation for any purpose is hereby granted without fee,
# provided that the above copyright notice appear in all copies and
# that both that copyright notice and this permission notice appear in
# supporting documentation.
#
# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
import termios
TYPE_CHECKING = False
if TYPE_CHECKING:
from typing import cast
else:
cast = lambda typ, val: val
class TermState:
def __init__(self, attrs: list[int | list[bytes]]) -> None:
self.iflag = cast(int, attrs[0])
self.oflag = cast(int, attrs[1])
self.cflag = cast(int, attrs[2])
self.lflag = cast(int, attrs[3])
self.ispeed = cast(int, attrs[4])
self.ospeed = cast(int, attrs[5])
self.cc = cast(list[bytes], attrs[6])
def as_list(self) -> list[int | list[bytes]]:
return [
self.iflag,
self.oflag,
self.cflag,
self.lflag,
self.ispeed,
self.ospeed,
# Always return a copy of the control characters list to ensure
# there are not any additional references to self.cc
self.cc[:],
]
def copy(self) -> "TermState":
return self.__class__(self.as_list())
def tcgetattr(fd: int) -> TermState:
return TermState(termios.tcgetattr(fd))
def tcsetattr(fd: int, when: int, attrs: TermState) -> None:
termios.tcsetattr(fd, when, attrs.as_list())
class Term(TermState):
TS__init__ = TermState.__init__
def __init__(self, fd: int = 0) -> None:
self.TS__init__(termios.tcgetattr(fd))
self.fd = fd
self.stack: list[list[int | list[bytes]]] = []
def save(self) -> None:
self.stack.append(self.as_list())
def set(self, when: int = termios.TCSANOW) -> None:
termios.tcsetattr(self.fd, when, self.as_list())
def restore(self) -> None:
self.TS__init__(self.stack.pop())
self.set()
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