File size: 7,851 Bytes
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import asyncio
import os
from codecs import getincrementaldecoder
import selectors
import signal
import sys
import termios
import tty
from typing import Any, TYPE_CHECKING
from threading import Event, Thread
if TYPE_CHECKING:
from rich.console import Console
import rich.repr
from .. import log
from .. import events
from ..driver import Driver
from ..geometry import Size
from .._types import MessageTarget
from .._xterm_parser import XTermParser
from .._profile import timer
@rich.repr.auto
class LinuxDriver(Driver):
"""Powers display and input for Linux / MacOS"""
def __init__(
self, console: "Console", target: "MessageTarget", debug: bool = False
) -> None:
super().__init__(console, target, debug)
self.fileno = sys.stdin.fileno()
self.attrs_before: list[Any] | None = None
self.exit_event = Event()
self._key_thread: Thread | None = None
def __rich_repr__(self) -> rich.repr.Result:
yield "debug", self._debug
def _get_terminal_size(self) -> tuple[int, int]:
width: int | None = 80
height: int | None = 25
import shutil
try:
width, height = shutil.get_terminal_size()
except (AttributeError, ValueError, OSError):
try:
width, height = shutil.get_terminal_size()
except (AttributeError, ValueError, OSError):
pass
width = width or 80
height = height or 25
return width, height
def _enable_mouse_support(self) -> None:
write = self.console.file.write
write("\x1b[?1000h") # SET_VT200_MOUSE
write("\x1b[?1003h") # SET_ANY_EVENT_MOUSE
write("\x1b[?1015h") # SET_VT200_HIGHLIGHT_MOUSE
write("\x1b[?1006h") # SET_SGR_EXT_MODE_MOUSE
# write("\x1b[?1007h")
self.console.file.flush()
# Note: E.g. lxterminal understands 1000h, but not the urxvt or sgr
# extensions.
def _enable_bracketed_paste(self) -> None:
"""Enable bracketed paste mode."""
self.console.file.write("\x1b[?2004h")
def _disable_bracketed_paste(self) -> None:
"""Disable bracketed paste mode."""
self.console.file.write("\x1b[?2004l")
def _disable_mouse_support(self) -> None:
write = self.console.file.write
write("\x1b[?1000l") #
write("\x1b[?1003l") #
write("\x1b[?1015l")
write("\x1b[?1006l")
self.console.file.flush()
def start_application_mode(self):
loop = asyncio.get_running_loop()
def send_size_event():
terminal_size = self._get_terminal_size()
width, height = terminal_size
textual_size = Size(width, height)
event = events.Resize(self._target, textual_size, textual_size)
asyncio.run_coroutine_threadsafe(
self._target.post_message(event),
loop=loop,
)
def on_terminal_resize(signum, stack) -> None:
send_size_event()
signal.signal(signal.SIGWINCH, on_terminal_resize)
self.console.set_alt_screen(True)
self._enable_mouse_support()
try:
self.attrs_before = termios.tcgetattr(self.fileno)
except termios.error:
# Ignore attribute errors.
self.attrs_before = None
try:
newattr = termios.tcgetattr(self.fileno)
except termios.error:
pass
else:
newattr[tty.LFLAG] = self._patch_lflag(newattr[tty.LFLAG])
newattr[tty.IFLAG] = self._patch_iflag(newattr[tty.IFLAG])
# VMIN defines the number of characters read at a time in
# non-canonical mode. It seems to default to 1 on Linux, but on
# Solaris and derived operating systems it defaults to 4. (This is
# because the VMIN slot is the same as the VEOF slot, which
# defaults to ASCII EOT = Ctrl-D = 4.)
newattr[tty.CC][termios.VMIN] = 1
termios.tcsetattr(self.fileno, termios.TCSANOW, newattr)
self.console.show_cursor(False)
self.console.file.write("\033[?1003h\n")
self.console.file.flush()
self._key_thread = Thread(target=self.run_input_thread, args=(loop,))
send_size_event()
self._key_thread.start()
self._request_terminal_sync_mode_support()
self._enable_bracketed_paste()
def _request_terminal_sync_mode_support(self):
self.console.file.write("\033[?2026$p")
self.console.file.flush()
@classmethod
def _patch_lflag(cls, attrs: int) -> int:
return attrs & ~(termios.ECHO | termios.ICANON | termios.IEXTEN | termios.ISIG)
@classmethod
def _patch_iflag(cls, attrs: int) -> int:
return attrs & ~(
# Disable XON/XOFF flow control on output and input.
# (Don't capture Ctrl-S and Ctrl-Q.)
# Like executing: "stty -ixon."
termios.IXON
| termios.IXOFF
|
# Don't translate carriage return into newline on input.
termios.ICRNL
| termios.INLCR
| termios.IGNCR
)
def disable_input(self) -> None:
try:
if not self.exit_event.is_set():
signal.signal(signal.SIGWINCH, signal.SIG_DFL)
self._disable_mouse_support()
self.exit_event.set()
if self._key_thread is not None:
self._key_thread.join()
termios.tcflush(self.fileno, termios.TCIFLUSH)
except Exception as error:
# TODO: log this
pass
def stop_application_mode(self) -> None:
self._disable_bracketed_paste()
self.disable_input()
if self.attrs_before is not None:
try:
termios.tcsetattr(self.fileno, termios.TCSANOW, self.attrs_before)
except termios.error:
pass
with self.console:
self.console.set_alt_screen(False)
self.console.show_cursor(True)
def run_input_thread(self, loop) -> None:
try:
self._run_input_thread(loop)
except Exception:
pass # TODO: log
def _run_input_thread(self, loop) -> None:
selector = selectors.DefaultSelector()
selector.register(self.fileno, selectors.EVENT_READ)
fileno = self.fileno
def more_data() -> bool:
"""Check if there is more data to parse."""
for key, events in selector.select(0.01):
if events:
return True
return False
parser = XTermParser(self._target, more_data, self._debug)
feed = parser.feed
utf8_decoder = getincrementaldecoder("utf-8")().decode
decode = utf8_decoder
read = os.read
EVENT_READ = selectors.EVENT_READ
try:
while not self.exit_event.is_set():
selector_events = selector.select(0.1)
for _selector_key, mask in selector_events:
if mask | EVENT_READ:
unicode_data = decode(read(fileno, 1024))
for event in feed(unicode_data):
self.process_event(event)
except Exception as error:
log(error)
finally:
with timer("selector.close"):
selector.close()
if __name__ == "__main__":
from rich.console import Console
from .. import events
console = Console()
from ..app import App
class MyApp(App):
async def on_mount(self, event: events.Mount) -> None:
self.set_timer(5, callback=self._close_messages)
MyApp.run()
|