| 1 | """Streaming renderer for CLI output. |
| 2 | |
| 3 | Uses Rich Live with auto_refresh=False for stable, flicker-free |
| 4 | markdown rendering during streaming. Ellipsis mode handles overflow. |
| 5 | """ |
| 6 | |
| 7 | from __future__ import annotations |
| 8 | |
| 9 | import sys |
| 10 | import time |
| 11 | |
| 12 | from rich.console import Console |
| 13 | from rich.live import Live |
| 14 | from rich.markdown import Markdown |
| 15 | from rich.text import Text |
| 16 | |
| 17 | from nanobot import __logo__ |
| 18 | |
| 19 | |
| 20 | def _make_console() -> Console: |
| 21 | """Create a Console that emits plain text when stdout is not a TTY. |
| 22 | |
| 23 | Rich's spinner, Live render, and cursor-visibility escape codes all |
| 24 | key off ``Console.is_terminal``. Forcing ``force_terminal=True`` overrode |
| 25 | the ``isatty()`` check and caused control sequences (``\\x1b[?25l``, |
| 26 | braille spinner frames) to pollute programmatic consumers such as |
| 27 | ``docker exec -i`` or pipes, even with ``NO_COLOR`` or ``TERM=dumb``. |
| 28 | Deferring to ``isatty()`` keeps Rich output in interactive terminals |
| 29 | and plain text everywhere else (#3265). |
| 30 | """ |
| 31 | return Console(file=sys.stdout, force_terminal=sys.stdout.isatty()) |
| 32 | |
| 33 | |
| 34 | class ThinkingSpinner: |
| 35 | """Spinner that shows 'nanobot is thinking...' with pause support.""" |
| 36 | |
| 37 | def __init__(self, console: Console | None = None): |
| 38 | c = console or _make_console() |
| 39 | self._spinner = c.status("[dim]nanobot is thinking...[/dim]", spinner="dots") |
| 40 | self._active = False |
| 41 | |
| 42 | def __enter__(self): |
| 43 | self._spinner.start() |
| 44 | self._active = True |
| 45 | return self |
| 46 | |
| 47 | def __exit__(self, *exc): |
| 48 | self._active = False |
| 49 | self._spinner.stop() |
| 50 | return False |
| 51 | |
| 52 | def pause(self): |
| 53 | """Context manager: temporarily stop spinner for clean output.""" |
| 54 | from contextlib import contextmanager |
| 55 | |
| 56 | @contextmanager |
| 57 | def _ctx(): |
| 58 | if self._spinner and self._active: |
| 59 | self._spinner.stop() |
| 60 | try: |
| 61 | yield |
| 62 | finally: |
| 63 | if self._spinner and self._active: |
| 64 | self._spinner.start() |
| 65 | |
| 66 | return _ctx() |
| 67 | |
| 68 | |
| 69 | class StreamRenderer: |
| 70 | """Rich Live streaming with markdown. auto_refresh=False avoids render races. |
| 71 | |
| 72 | Deltas arrive pre-filtered (no <think> tags) from the agent loop. |
| 73 | |
| 74 | Flow per round: |
| 75 | spinner -> first visible delta -> header + Live renders -> |
| 76 | on_end -> Live stops (content stays on screen) |
| 77 | """ |
| 78 | |
| 79 | def __init__(self, render_markdown: bool = True, show_spinner: bool = True): |
| 80 | self._md = render_markdown |
| 81 | self._show_spinner = show_spinner |
| 82 | self._buf = "" |
| 83 | self._live: Live | None = None |
| 84 | self._t = 0.0 |
| 85 | self.streamed = False |
| 86 | self._spinner: ThinkingSpinner | None = None |
| 87 | self._start_spinner() |
| 88 | |
| 89 | def _render(self): |
| 90 | return Markdown(self._buf) if self._md and self._buf else Text(self._buf or "") |
| 91 | |
| 92 | def _start_spinner(self) -> None: |
| 93 | if self._show_spinner: |
| 94 | self._spinner = ThinkingSpinner() |
| 95 | self._spinner.__enter__() |
| 96 | |
| 97 | def _stop_spinner(self) -> None: |
| 98 | if self._spinner: |
| 99 | self._spinner.__exit__(None, None, None) |
| 100 | self._spinner = None |
| 101 | |
| 102 | async def on_delta(self, delta: str) -> None: |
| 103 | self.streamed = True |
| 104 | self._buf += delta |
| 105 | if self._live is None: |
| 106 | if not self._buf.strip(): |
| 107 | return |
| 108 | self._stop_spinner() |
| 109 | c = _make_console() |
| 110 | c.print() |
| 111 | c.print(f"[cyan]{__logo__} nanobot[/cyan]") |
| 112 | self._live = Live(self._render(), console=c, auto_refresh=False) |
| 113 | self._live.start() |
| 114 | now = time.monotonic() |
| 115 | if (now - self._t) > 0.15: |
| 116 | self._live.update(self._render()) |
| 117 | self._live.refresh() |
| 118 | self._t = now |
| 119 | |
| 120 | async def on_end(self, *, resuming: bool = False) -> None: |
| 121 | if self._live: |
| 122 | self._live.update(self._render()) |
| 123 | self._live.refresh() |
| 124 | self._live.stop() |
| 125 | self._live = None |
| 126 | self._stop_spinner() |
| 127 | if resuming: |
| 128 | self._buf = "" |
| 129 | self._start_spinner() |
| 130 | else: |
| 131 | _make_console().print() |
| 132 | |
| 133 | def stop_for_input(self) -> None: |
| 134 | """Stop spinner before user input to avoid prompt_toolkit conflicts.""" |
| 135 | self._stop_spinner() |
| 136 | |
| 137 | async def close(self) -> None: |
| 138 | """Stop spinner/live without rendering a final streamed round.""" |
| 139 | if self._live: |
| 140 | self._live.stop() |
| 141 | self._live = None |
| 142 | self._stop_spinner() |
| 143 |