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unix_console.py
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# Copyright 2000-2010 Michael Hudson-Doyle <micahel@gmail.com> # Antonio Cuni # Armin Rigo # # 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. from __future__ import annotations import errno import os import re import select import signal import struct import termios import time import platform from fcntl import ioctl from . import curses from .console import Console, Event from .fancy_termios import tcgetattr, tcsetattr from .trace import trace from .unix_eventqueue import EventQueue from .utils import wlen TYPE_CHECKING = False # types if TYPE_CHECKING: from typing import IO, Literal, overload else: overload = lambda func: None class InvalidTerminal(RuntimeError): pass _error = (termios.error, curses.error, InvalidTerminal) SIGWINCH_EVENT = "repaint" FIONREAD = getattr(termios, "FIONREAD", None) TIOCGWINSZ = getattr(termios, "TIOCGWINSZ", None) # ------------ start of baudrate definitions ------------ # Add (possibly) missing baudrates (check termios man page) to termios def add_baudrate_if_supported(dictionary: dict[int, int], rate: int) -> None: baudrate_name = "B%d" % rate if hasattr(termios, baudrate_name): dictionary[getattr(termios, baudrate_name)] = rate # Check the termios man page (Line speed) to know where these # values come from. potential_baudrates = [ 0, 110, 115200, 1200, 134, 150, 1800, 19200, 200, 230400, 2400, 300, 38400, 460800, 4800, 50, 57600, 600, 75, 9600, ] ratedict: dict[int, int] = {} for rate in potential_baudrates: add_baudrate_if_supported(ratedict, rate) # Clean up variables to avoid unintended usage del rate, add_baudrate_if_supported # ------------ end of baudrate definitions ------------ delayprog = re.compile(b"\\$<([0-9]+)((?:/|\\*){0,2})>") try: poll: type[select.poll] = select.poll except AttributeError: # this is exactly the minumum necessary to support what we # do with poll objects class MinimalPoll: def __init__(self): pass def register(self, fd, flag): self.fd = fd # note: The 'timeout' argument is received as *milliseconds* def poll(self, timeout: float | None = None) -> list[int]: if timeout is None: r, w, e = select.select([self.fd], [], []) else: r, w, e = select.select([self.fd], [], [], timeout/1000) return r poll = MinimalPoll # type: ignore[assignment] class UnixConsole(Console): def __init__( self, f_in: IO[bytes] | int = 0, f_out: IO[bytes] | int = 1, term: str = "", encoding: str = "", ): """ Initialize the UnixConsole. Parameters: - f_in (int or file-like object): Input file descriptor or object. - f_out (int or file-like object): Output file descriptor or object. - term (str): Terminal name. - encoding (str): Encoding to use for I/O operations. """ super().__init__(f_in, f_out, term, encoding) self.pollob = poll() self.pollob.register(self.input_fd, select.POLLIN) self.input_buffer = b"" self.input_buffer_pos = 0 curses.setupterm(term or None, self.output_fd) self.term = term @overload def _my_getstr(cap: str, optional: Literal[False] = False) -> bytes: ... @overload def _my_getstr(cap: str, optional: bool) -> bytes | None: ... def _my_getstr(cap: str, optional: bool = False) -> bytes | None: r = curses.tigetstr(cap) if not optional and r is None: raise InvalidTerminal( f"terminal doesn't have the required {cap} capability" ) return r self._bel = _my_getstr("bel") self._civis = _my_getstr("civis", optional=True) self._clear = _my_getstr("clear") self._cnorm = _my_getstr("cnorm", optional=True) self._cub = _my_getstr("cub", optional=True) self._cub1 = _my_getstr("cub1", optional=True) self._cud = _my_getstr("cud", optional=True) self._cud1 = _my_getstr("cud1", optional=True) self._cuf = _my_getstr("cuf", optional=True) self._cuf1 = _my_getstr("cuf1", optional=True) self._cup = _my_getstr("cup") self._cuu = _my_getstr("cuu", optional=True) self._cuu1 = _my_getstr("cuu1", optional=True) self._dch1 = _my_getstr("dch1", optional=True) self._dch = _my_getstr("dch", optional=True) self._el = _my_getstr("el") self._hpa = _my_getstr("hpa", optional=True) self._ich = _my_getstr("ich", optional=True) self._ich1 = _my_getstr("ich1", optional=True) self._ind = _my_getstr("ind", optional=True) self._pad = _my_getstr("pad", optional=True) self._ri = _my_getstr("ri", optional=True) self._rmkx = _my_getstr("rmkx", optional=True) self._smkx = _my_getstr("smkx", optional=True) self.__setup_movement() self.event_queue = EventQueue(self.input_fd, self.encoding) self.cursor_visible = 1 signal.signal(signal.SIGCONT, self._sigcont_handler) def _sigcont_handler(self, signum, frame): self.restore() self.prepare() def more_in_buffer(self) -> bool: return bool( self.input_buffer and self.input_buffer_pos < len(self.input_buffer) ) def __read(self, n: int) -> bytes: if not self.more_in_buffer(): self.input_buffer = os.read(self.input_fd, 10000) ret = self.input_buffer[self.input_buffer_pos : self.input_buffer_pos + n] self.input_buffer_pos += len(ret) if self.input_buffer_pos >= len(self.input_buffer): self.input_buffer = b"" self.input_buffer_pos = 0 return ret def change_encoding(self, encoding: str) -> None: """ Change the encoding used for I/O operations. Parameters: - encoding (str): New encoding to use. """ self.encoding = encoding def refresh(self, screen, c_xy): """ Refresh the console screen. Parameters: - screen (list): List of strings representing the screen contents. - c_xy (tuple): Cursor position (x, y) on the screen. """ cx, cy = c_xy if not self.__gone_tall: while len(self.screen) < min(len(screen), self.height): self.__hide_cursor() self.__move(0, len(self.screen) - 1) self.__write("\n") self.posxy = 0, len(self.screen) self.screen.append("") else: while len(self.screen) < len(screen): self.screen.append("") if len(screen) > self.height: self.__gone_tall = 1 self.__move = self.__move_tall px, py = self.posxy old_offset = offset = self.__offset height = self.height # we make sure the cursor is on the screen, and that we're # using all of the screen if we can if cy < offset: offset = cy elif cy >= offset + height: offset = cy - height + 1 elif offset > 0 and len(screen) < offset + height: offset = max(len(screen) - height, 0) screen.append("") oldscr = self.screen[old_offset : old_offset + height] newscr = screen[offset : offset + height] # use hardware scrolling if we have it. if old_offset > offset and self._ri: self.__hide_cursor() self.__write_code(self._cup, 0, 0) self.posxy = 0, old_offset for i in range(old_offset - offset): self.__write_code(self._ri) oldscr.pop(-1) oldscr.insert(0, "") elif old_offset < offset and self._ind: self.__hide_cursor() self.__write_code(self._cup, self.height - 1, 0) self.posxy = 0, old_offset + self.height - 1 for i in range(offset - old_offset): self.__write_code(self._ind) oldscr.pop(0) oldscr.append("") self.__offset = offset for ( y, oldline, newline, ) in zip(range(offset, offset + height), oldscr, newscr): if oldline != newline: self.__write_changed_line(y, oldline, newline, px) y = len(newscr) while y < len(oldscr): self.__hide_cursor() self.__move(0, y) self.posxy = 0, y self.__write_code(self._el) y += 1 self.__show_cursor() self.screen = screen.copy() self.move_cursor(cx, cy) self.flushoutput() def move_cursor(self, x, y): """ Move the cursor to the specified position on the screen. Parameters: - x (int): X coordinate. - y (int): Y coordinate. """ if y < self.__offset or y >= self.__offset + self.height: self.event_queue.insert(Event("scroll", None)) else: self.__move(x, y) self.posxy = x, y self.flushoutput() def prepare(self): """ Prepare the console for input/output operations. """ self.__svtermstate = tcgetattr(self.input_fd) raw = self.__svtermstate.copy() raw.iflag &= ~(termios.INPCK | termios.ISTRIP | termios.IXON) raw.oflag &= ~(termios.OPOST) raw.cflag &= ~(termios.CSIZE | termios.PARENB) raw.cflag |= termios.CS8 raw.iflag |= termios.BRKINT raw.lflag &= ~(termios.ICANON | termios.ECHO | termios.IEXTEN) raw.lflag |= termios.ISIG raw.cc[termios.VMIN] = 1 raw.cc[termios.VTIME] = 0 tcsetattr(self.input_fd, termios.TCSADRAIN, raw) # In macOS terminal we need to deactivate line wrap via ANSI escape code if platform.system() == "Darwin" and os.getenv("TERM_PROGRAM") == "Apple_Terminal": os.write(self.output_fd, b"\033[?7l") self.screen = [] self.height, self.width = self.getheightwidth() self.__buffer = [] self.posxy = 0, 0 self.__gone_tall = 0 self.__move = self.__move_short self.__offset = 0 self.__maybe_write_code(self._smkx) try: self.old_sigwinch = signal.signal(signal.SIGWINCH, self.__sigwinch) except ValueError: pass self.__enable_bracketed_paste() def restore(self): """ Restore the console to the default state """ self.__disable_bracketed_paste() self.__maybe_write_code(self._rmkx) self.flushoutput() tcsetattr(self.input_fd, termios.TCSADRAIN, self.__svtermstate) if platform.system() == "Darwin" and os.getenv("TERM_PROGRAM") == "Apple_Terminal": os.write(self.output_fd, b"\033[?7h") if hasattr(self, "old_sigwinch"): signal.signal(signal.SIGWINCH, self.old_sigwinch) del self.old_sigwinch def push_char(self, char: int | bytes) -> None: """ Push a character to the console event queue. """ trace("push char {char!r}", char=char) self.event_queue.push(char) def get_event(self, block: bool = True) -> Event | None: """ Get an event from the console event queue. Parameters: - block (bool): Whether to block until an event is available. Returns: - Event: Event object from the event queue. """ if not block and not self.wait(timeout=0): return None while self.event_queue.empty(): while True: try: self.push_char(self.__read(1)) except OSError as err: if err.errno == errno.EINTR: if not self.event_queue.empty(): return self.event_queue.get() else: continue else: raise else: break return self.event_queue.get() def wait(self, timeout: float | None = None) -> bool: """ Wait for events on the console. """ return ( not self.event_queue.empty() or self.more_in_buffer() or bool(self.pollob.poll(timeout)) ) def set_cursor_vis(self, visible): """ Set the visibility of the cursor. Parameters: - visible (bool): Visibility flag. """ if visible: self.__show_cursor() else: self.__hide_cursor() if TIOCGWINSZ: def getheightwidth(self): """ Get the height and width of the console. Returns: - tuple: Height and width of the console. """ try: return int(os.environ["LINES"]), int(os.environ["COLUMNS"]) except (KeyError, TypeError, ValueError): try: size = ioctl(self.input_fd, TIOCGWINSZ, b"\000" * 8) except OSError: return 25, 80 height, width = struct.unpack("hhhh", size)[0:2] if not height: return 25, 80 return height, width else: def getheightwidth(self): """ Get the height and width of the console. Returns: - tuple: Height and width of the console. """ try: return int(os.environ["LINES"]), int(os.environ["COLUMNS"]) except (KeyError, TypeError, ValueError): return 25, 80 def forgetinput(self): """ Discard any pending input on the console. """ termios.tcflush(self.input_fd, termios.TCIFLUSH) def flushoutput(self): """ Flush the output buffer. """ for text, iscode in self.__buffer: if iscode: self.__tputs(text) else: os.write(self.output_fd, text.encode(self.encoding, "replace")) del self.__buffer[:] def finish(self): """ Finish console operations and flush the output buffer. """ y = len(self.screen) - 1 while y >= 0 and not self.screen[y]: y -= 1 self.__move(0, min(y, self.height + self.__offset - 1)) self.__write("\n\r") self.flushoutput() def beep(self): """ Emit a beep sound. """ self.__maybe_write_code(self._bel) self.flushoutput() if FIONREAD: def getpending(self): """ Get pending events from the console event queue. Returns: - Event: Pending event from the event queue. """ e = Event("key", "", b"") while not self.event_queue.empty(): e2 = self.event_queue.get() e.data += e2.data e.raw += e.raw amount = struct.unpack("i", ioctl(self.input_fd, FIONREAD, b"\0\0\0\0"))[0] raw = self.__read(amount) data = str(raw, self.encoding, "replace") e.data += data e.raw += raw return e else: def getpending(self): """ Get pending events from the console event queue. Returns: - Event: Pending event from the event queue. """ e = Event("key", "", b"") while not self.event_queue.empty(): e2 = self.event_queue.get() e.data += e2.data e.raw += e.raw amount = 10000 raw = self.__read(amount) data = str(raw, self.encoding, "replace") e.data += data e.raw += raw return e def clear(self): """ Clear the console screen. """ self.__write_code(self._clear) self.__gone_tall = 1 self.__move = self.__move_tall self.posxy = 0, 0 self.screen = [] @property def input_hook(self): try: import posix except ImportError: return None if posix._is_inputhook_installed(): return posix._inputhook def __enable_bracketed_paste(self) -> None: os.write(self.output_fd, b"\x1b[?2004h") def __disable_bracketed_paste(self) -> None: os.write(self.output_fd, b"\x1b[?2004l") def __setup_movement(self): """ Set up the movement functions based on the terminal capabilities. """ if 0 and self._hpa: # hpa don't work in windows telnet :-( self.__move_x = self.__move_x_hpa elif self._cub and self._cuf: self.__move_x = self.__move_x_cub_cuf elif self._cub1 and self._cuf1: self.__move_x = self.__move_x_cub1_cuf1 else: raise RuntimeError("insufficient terminal (horizontal)") if self._cuu and self._cud: self.__move_y = self.__move_y_cuu_cud elif self._cuu1 and self._cud1: self.__move_y = self.__move_y_cuu1_cud1 else: raise RuntimeError("insufficient terminal (vertical)") if self._dch1: self.dch1 = self._dch1 elif self._dch: self.dch1 = curses.tparm(self._dch, 1) else: self.dch1 = None if self._ich1: self.ich1 = self._ich1 elif self._ich: self.ich1 = curses.tparm(self._ich, 1) else: self.ich1 = None self.__move = self.__move_short def __write_changed_line(self, y, oldline, newline, px_coord): # this is frustrating; there's no reason to test (say) # self.dch1 inside the loop -- but alternative ways of # structuring this function are equally painful (I'm trying to # avoid writing code generators these days...) minlen = min(wlen(oldline), wlen(newline)) x_pos = 0 x_coord = 0 px_pos = 0 j = 0 for c in oldline: if j >= px_coord: break j += wlen(c) px_pos += 1 # reuse the oldline as much as possible, but stop as soon as we # encounter an ESCAPE, because it might be the start of an escape # sequene while ( x_coord < minlen and oldline[x_pos] == newline[x_pos] and newline[x_pos] != "\x1b" ): x_coord += wlen(newline[x_pos]) x_pos += 1 # if we need to insert a single character right after the first detected change if oldline[x_pos:] == newline[x_pos + 1 :] and self.ich1: if ( y == self.posxy[1] and x_coord > self.posxy[0] and oldline[px_pos:x_pos] == newline[px_pos + 1 : x_pos + 1] ): x_pos = px_pos x_coord = px_coord character_width = wlen(newline[x_pos]) self.__move(x_coord, y) self.__write_code(self.ich1) self.__write(newline[x_pos]) self.posxy = x_coord + character_width, y # if it's a single character change in the middle of the line elif ( x_coord < minlen and oldline[x_pos + 1 :] == newline[x_pos + 1 :] and wlen(oldline[x_pos]) == wlen(newline[x_pos]) ): character_width = wlen(newline[x_pos]) self.__move(x_coord, y) self.__write(newline[x_pos]) self.posxy = x_coord + character_width, y # if this is the last character to fit in the line and we edit in the middle of the line elif ( self.dch1 and self.ich1 and wlen(newline) == self.width and x_coord < wlen(newline) - 2 and newline[x_pos + 1 : -1] == oldline[x_pos:-2] ): self.__hide_cursor() self.__move(self.width - 2, y) self.posxy = self.width - 2, y self.__write_code(self.dch1) character_width = wlen(newline[x_pos]) self.__move(x_coord, y) self.__write_code(self.ich1) self.__write(newline[x_pos]) self.posxy = character_width + 1, y else: self.__hide_cursor() self.__move(x_coord, y) if wlen(oldline) > wlen(newline): self.__write_code(self._el) self.__write(newline[x_pos:]) self.posxy = wlen(newline), y if "\x1b" in newline: # ANSI escape characters are present, so we can't assume # anything about the position of the cursor. Moving the cursor # to the left margin should work to get to a known position. self.move_cursor(0, y) def __write(self, text): self.__buffer.append((text, 0)) def __write_code(self, fmt, *args): self.__buffer.append((curses.tparm(fmt, *args), 1)) def __maybe_write_code(self, fmt, *args): if fmt: self.__write_code(fmt, *args) def __move_y_cuu1_cud1(self, y): assert self._cud1 is not None assert self._cuu1 is not None dy = y - self.posxy[1] if dy > 0: self.__write_code(dy * self._cud1) elif dy < 0: self.__write_code((-dy) * self._cuu1) def __move_y_cuu_cud(self, y): dy = y - self.posxy[1] if dy > 0: self.__write_code(self._cud, dy) elif dy < 0: self.__write_code(self._cuu, -dy) def __move_x_hpa(self, x: int) -> None: if x != self.posxy[0]: self.__write_code(self._hpa, x) def __move_x_cub1_cuf1(self, x: int) -> None: assert self._cuf1 is not None assert self._cub1 is not None dx = x - self.posxy[0] if dx > 0: self.__write_code(self._cuf1 * dx) elif dx < 0: self.__write_code(self._cub1 * (-dx)) def __move_x_cub_cuf(self, x: int) -> None: dx = x - self.posxy[0] if dx > 0: self.__write_code(self._cuf, dx) elif dx < 0: self.__write_code(self._cub, -dx) def __move_short(self, x, y): self.__move_x(x) self.__move_y(y) def __move_tall(self, x, y): assert 0 <= y - self.__offset < self.height, y - self.__offset self.__write_code(self._cup, y - self.__offset, x) def __sigwinch(self, signum, frame): self.height, self.width = self.getheightwidth() self.event_queue.insert(Event("resize", None)) def __hide_cursor(self): if self.cursor_visible: self.__maybe_write_code(self._civis) self.cursor_visible = 0 def __show_cursor(self): if not self.cursor_visible: self.__maybe_write_code(self._cnorm) self.cursor_visible = 1 def repaint(self): if not self.__gone_tall: self.posxy = 0, self.posxy[1] self.__write("\r") ns = len(self.screen) * ["\000" * self.width] self.screen = ns else: self.posxy = 0, self.__offset self.__move(0, self.__offset) ns = self.height * ["\000" * self.width] self.screen = ns def __tputs(self, fmt, prog=delayprog): """A Python implementation of the curses tputs function; the curses one can't really be wrapped in a sane manner. I have the strong suspicion that this is complexity that will never do anyone any good.""" # using .get() means that things will blow up # only if the bps is actually needed (which I'm # betting is pretty unlkely) bps = ratedict.get(self.__svtermstate.ospeed) while 1: m = prog.search(fmt) if not m: os.write(self.output_fd, fmt) break x, y = m.span() os.write(self.output_fd, fmt[:x]) fmt = fmt[y:] delay = int(m.group(1)) if b"*" in m.group(2): delay *= self.height if self._pad and bps is not None: nchars = (bps * delay) / 1000 os.write(self.output_fd, self._pad * nchars) else: time.sleep(float(delay) / 1000.0)