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9853bbb1dc
Without the ability to set required capabilities, the REPL cannot
function properly (syntax highlighting and multiline editing can't
work).
We refuse to work in this degraded state.
(cherry picked from commit 2fc7004d54)
Co-authored-by: Łukasz Langa <lukasz@langa.pl>
82 lines
2.5 KiB
Python
82 lines
2.5 KiB
Python
# Copyright 2000-2004 Michael Hudson-Doyle <micahel@gmail.com>
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#
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# All Rights Reserved
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#
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#
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# Permission to use, copy, modify, and distribute this software and
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# its documentation for any purpose is hereby granted without fee,
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# provided that the above copyright notice appear in all copies and
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# that both that copyright notice and this permission notice appear in
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# supporting documentation.
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#
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# THE AUTHOR MICHAEL HUDSON DISCLAIMS ALL WARRANTIES WITH REGARD TO
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# THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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# AND FITNESS, IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL,
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# INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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# RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF
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# CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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# CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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import termios
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TYPE_CHECKING = False
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if TYPE_CHECKING:
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from typing import cast
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else:
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cast = lambda typ, val: val
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class TermState:
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def __init__(self, attrs: list[int | list[bytes]]) -> None:
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self.iflag = cast(int, attrs[0])
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self.oflag = cast(int, attrs[1])
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self.cflag = cast(int, attrs[2])
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self.lflag = cast(int, attrs[3])
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self.ispeed = cast(int, attrs[4])
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self.ospeed = cast(int, attrs[5])
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self.cc = cast(list[bytes], attrs[6])
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def as_list(self) -> list[int | list[bytes]]:
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return [
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self.iflag,
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self.oflag,
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self.cflag,
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self.lflag,
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self.ispeed,
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self.ospeed,
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# Always return a copy of the control characters list to ensure
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# there are not any additional references to self.cc
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self.cc[:],
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]
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def copy(self) -> "TermState":
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return self.__class__(self.as_list())
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def tcgetattr(fd: int) -> TermState:
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return TermState(termios.tcgetattr(fd))
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def tcsetattr(fd: int, when: int, attrs: TermState) -> None:
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termios.tcsetattr(fd, when, attrs.as_list())
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class Term(TermState):
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TS__init__ = TermState.__init__
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def __init__(self, fd: int = 0) -> None:
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self.TS__init__(termios.tcgetattr(fd))
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self.fd = fd
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self.stack: list[list[int | list[bytes]]] = []
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def save(self) -> None:
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self.stack.append(self.as_list())
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def set(self, when: int = termios.TCSANOW) -> None:
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termios.tcsetattr(self.fd, when, self.as_list())
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def restore(self) -> None:
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self.TS__init__(self.stack.pop())
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self.set()
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