243 lines
7.0 KiB
Python
243 lines
7.0 KiB
Python
#!/usr/bin/env python3
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import asyncio
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import re
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import sys
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import termios
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import tty
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from base64 import standard_b64encode
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import array
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import fcntl
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import zlib
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import mmap
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import os
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import select
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from enum import Enum
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from terminalio import TerminalIO
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SHM_NAME = "/kitty-shm-frame"
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class Kitty_Format(Enum):
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RGB = 24
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RGBA = 32
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PNG = 100
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class Terminal():
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def __init__(self):
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self.terminal_io = TerminalIO()
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self.terminal_io.start()
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self.supports_kitty_graphics = supports_kitty_graphics()
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def get_terminal_size(self) -> tuple[int, int]:
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"""Get (rows, cols) of the terminal"""
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buf = array.array("H", [0, 0, 0, 0])
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fcntl.ioctl(sys.stdout, termios.TIOCGWINSZ, buf)
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rows, cols, width, height = buf
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return (rows, cols)
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async def get_terminal_cell_size(self) -> tuple[int, int]:
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"""Get (height, width) of a single cell in px"""
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reply = await self._query_terminal("\x1b[16t", "t")
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match = re.search(r"\[6;(\d+);(\d+)t", reply)
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if match:
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v_pix, h_pix = map(int, match.groups())
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return v_pix, h_pix
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print(reply)
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raise ValueError("Failed to parse terminal cell size response")
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async def get_terminal_size_pixel(self) -> tuple[int, int]:
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"""Get (height, width) of the terminal in px"""
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reply = await self._query_terminal("\x1b[14t", "t")
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match = re.search(r"\[4;(\d+);(\d+)t", reply)
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if match:
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height, width = map(int, match.groups())
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return height, width
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raise ValueError("Failed to parse terminal pixel size response")
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def hide_cursor(self) -> None:
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"""Tell the terminal to hide the cursor."""
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_write_stdout("\x1b[?25l")
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def show_cursor(self) -> None:
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"""Tell the terminal to show the cursor."""
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_write_stdout("\x1b[?25h")
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def set_position(self, y: int, x: int) -> None:
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"""Set the cursor position to y, x"""
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_write_stdout(f"\x1b[{y};{x}H")
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async def get_position(self) -> tuple[int, int]:
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"""Get the (y, x) position of the cursor"""
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reply = await self._query_terminal("\x1b[6n", "R")
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match = re.search(r"\[(\d+);(\d+)R", reply)
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if match:
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y, x = map(int, match.groups())
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return y, x
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raise ValueError("Failed to parse cursor position response")
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async def draw(
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self,
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buffer,
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width: int | None,
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height: int | None,
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pixel_format: Kitty_Format = Kitty_Format.RGBA,
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image_num: int = 1,
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compress=False,
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use_shm: bool = False,
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) -> None:
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"""Display an image in the terminal."""
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if (pixel_format != Kitty_Format.PNG or use_shm) and (width is None or height is None):
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raise ValueError(
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"shm transfer or using image formats other than PNG and require height and width"
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)
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kwargs = {"a": "T", "i": image_num, "f": pixel_format.value, "t": "s" if use_shm else "d"}
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if width:
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kwargs["s"] = width
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if height:
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kwargs["v"] = height
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if compress:
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kwargs["o"] = "z"
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data = zlib.compress(buffer)
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else:
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data = buffer
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if use_shm:
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# write to shm
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_mmap(data, width, height)
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# set shm name as payload
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data = SHM_NAME
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await _write_chunked(**kwargs, data=data)
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await asyncio.sleep(0.001)
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async def _query_terminal(self, escape: str, endchar: str) -> str:
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"""
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Send `escape` to the terminal, read the response until
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`endchar`, return response (including `endchar`)
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"""
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# Save the current terminal settings
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loop = asyncio.get_running_loop()
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fd = sys.stdin.fileno()
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old_settings = termios.tcgetattr(fd)
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def read_terminal_response() -> str:
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tty.setraw(fd)
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_write_stdout(escape)
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response = ""
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while True:
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char = sys.stdin.read(1)
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response += char
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if char == endchar:
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break
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return response
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try:
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response = await loop.run_in_executor(None, read_terminal_response)
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finally:
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# Restore the terminal settings
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termios.tcsetattr(fd, termios.TCSANOW, old_settings)
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return response
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def _mmap(np_image, width: int, height: int) -> None:
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"""Write image data to shared memory"""
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shm_size = width * height * 4 # RGBA
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fd = os.open(f"/dev/shm{SHM_NAME}", os.O_CREAT | os.O_RDWR)
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os.ftruncate(fd, shm_size)
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shm = mmap.mmap(fd, shm_size, mmap.MAP_SHARED, mmap.PROT_WRITE)
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# write to shared memory
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shm.seek(0)
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shm.write(np_image.tobytes())
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shm.flush()
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def supports_kitty_graphics(timeout=0.1) -> bool:
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"""Check if the terminal has support for the graphics protocol."""
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if not sys.stdout.isatty():
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return False
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fd = sys.stdin.fileno()
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old_settings = termios.tcgetattr(fd)
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try:
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# Set terminal to raw mode
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tty.setraw(fd)
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# Send Kitty graphics query escape code
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sys.stdout.write("\033_Gs=1,v=1,a=q,t=d,f=24;AAAA\033\\")
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sys.stdout.flush()
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# Wait for response with timeout
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rlist, _, _ = select.select([fd], [], [], timeout)
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if not rlist:
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return False
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# Read response
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response = os.read(fd, 1024).decode("utf-8", "ignore")
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return response.startswith("\033_GOK")
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finally:
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# Restore terminal settings
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termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
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def _serialize_gr_command(**cmd) -> bytes:
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payload = cmd.pop("payload", None)
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cmd = ",".join(f"{k}={v}" for k, v in cmd.items())
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ans = []
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w = ans.append
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w(b"\033_G"), w(cmd.encode("ascii"))
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if payload:
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w(b";")
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w(payload)
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w(b"\033\\")
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return b"".join(ans)
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async def _write_chunked(**cmd) -> None:
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if cmd["t"] == "s":
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data = standard_b64encode(bytes(cmd.pop("data"), "utf-8"))
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else:
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data = standard_b64encode(cmd.pop("data"))
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while data:
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chunk, data = data[:4096], data[4096:]
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m = 1 if data else 0
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payload = _serialize_gr_command(payload=chunk, m=m, **cmd)
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sys.stdout.buffer.write(payload)
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sys.stdout.flush()
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cmd.clear()
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def _write_stdout(cmd: str) -> None:
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"""Write a command string to stdout and flush."""
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sys.stdout.write(cmd)
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sys.stdout.flush()
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async def main():
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term = Terminal()
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rows, cols = term.get_terminal_size()
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v_pix, h_pix = await term.get_terminal_cell_size()
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height, width = await term.get_terminal_size_pixel()
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y, x = await term.get_position()
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print(f"Terminal has {rows} rows, {cols} cols = {rows * cols} cells")
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print(f"Cell size: {h_pix}x{v_pix} px")
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print(f"Dimensions: {width}x{height} px")
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print("Cursor is at y, x:", y, x)
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print(f"Supports graphics: {term.supports_kitty_graphics}")
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if __name__ == "__main__":
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asyncio.run(main())
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