Proof of concept, running scrollart (https://scrollart.org/) in Textual

scrollart.py

import os
import sys
import asyncio
import asyncio.subprocess

from textual import work
from textual.app import App, ComposeResult
from textual.widgets import Log


class ScrollArt(App):
    CSS = """
    Log {
        overflow-x: scroll;
    }
    """

    def compose(self) -> ComposeResult:
        yield Log(max_lines=1000)

    def on_mount(self) -> None:
        self.call_after_refresh(self.run_scrollart_script, sys.argv[1])

    @work
    async def run_scrollart_script(self, path: str) -> None:
        log = self.query_one(Log)
        environ = dict(os.environ)
        width, height = self.screen.scrollable_content_region.size
        environ |= {"COLUMNS": str(width), "ROWS": str(height), "PYTHONUNBUFFERED": "1"}
        process = await asyncio.create_subprocess_exec(
            sys.executable,
            path,
            stdin=asyncio.subprocess.DEVNULL,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE,
            env=environ,
        )
        self.notify(str(process))
        assert process.stdout is not None
        assert process.stderr is not None
        while line_bytes := await process.stdout.readline():
            log.write(line_bytes.decode("utf-8"))
        self.notify(str(process))
        stderr = (await process.stderr.read()).decode("utf-8")
        log.write(stderr)


if __name__ == "__main__":
    app = ScrollArt()
    app.run()