Angel is a TUI-based autonomous coding agent built on fauxtp GenServers.
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angel/tui.py
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angel/tui.py
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"""Angel TUI — prompt_toolkit Application-based terminal interface.
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A lightweight full-screen TUI that keeps an output pane above a persistent
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input prompt. Coloring is applied by a simple line-prefix lexer — no Rich,
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no CSS, no heavyweight widget toolkit.
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input prompt. Thinking/tool status is shown in a dedicated status bar above
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the input line (à la Claude Code), keeping the chat window clean.
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"""
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from __future__ import annotations
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from prompt_toolkit.filters import Condition
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from prompt_toolkit.formatted_text import ANSI, StyleAndTextTuples
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from prompt_toolkit.key_binding import KeyBindings
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from prompt_toolkit.layout import HSplit, Layout, VSplit, Window
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from prompt_toolkit.layout import ConditionalContainer, HSplit, Layout, Window
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from prompt_toolkit.layout.controls import BufferControl, FormattedTextControl
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from prompt_toolkit.layout.processors import BeforeInput
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from prompt_toolkit.lexers import Lexer
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"output.welcome": "#c77dff",
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"output.default": "#e8e0f0",
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"separator": "#c77dff",
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"status-bar": "#c77dff italic",
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"input": "#e8e0f0",
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}
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)
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return "output.title"
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if any(line.startswith(p) for p in ("✨", "🧠", "Still")):
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return "output.status"
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if line.startswith("I'm Angel") or line.startswith("Type a message"):
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if line.startswith("I'm Angel — your autonomous coding agent.") or line.startswith("Type a message and I'll get to work. Ctrl+C to quit"):
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return "output.welcome"
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return "output.default"
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self._cast: Callable[..., Any] | None = cast_fn
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self._busy = False
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self._app: Application[None] | None = None
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self._status_text: str = ""
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self._output_buffer = Buffer(
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name="output",
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)
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self._input_buffer = Buffer(name="input", multiline=False)
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# ── status bar helpers ──────────────────────────────────────────
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def _get_status_fragments(self) -> StyleAndTextTuples:
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"""Return formatted text for the thinking/status bar."""
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if self._status_text:
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return [("class:status-bar", f" {self._status_text}")]
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return []
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def _set_status(self, text: str) -> None:
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"""Update the status bar text and repaint."""
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self._status_text = text
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if self._app is not None:
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self._app.invalidate()
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# ── build the prompt_toolkit Application ────────────────────────
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def _build(self) -> Application[None]:
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height=1,
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)
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status_bar = ConditionalContainer(
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content=Window(
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content=FormattedTextControl(self._get_status_fragments),
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height=1,
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style="class:status-bar",
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),
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filter=Condition(lambda: bool(self._status_text)),
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)
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input_window = Window(
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content=BufferControl(
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buffer=self._input_buffer,
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style="class:input",
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)
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root = HSplit([output_window, separator, input_window])
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root = HSplit([output_window, separator, status_bar, input_window])
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return Application(
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layout=Layout(root, focused_element=input_window),
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# ── callbacks from the actor thread ─────────────────────────────
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def on_agent_status(self, text: str) -> None:
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self._append(text)
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"""Show thinking status in the status bar, not the chat."""
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self._set_status(text)
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def on_tool_call(self, name: str, args_preview: str) -> None:
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"""Log tool calls to the chat and update the status bar."""
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preview = args_preview
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if len(preview) > 120:
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preview = preview[:120] + "…"
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self._append(f" 🔧 {name} {preview}")
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self._set_status(f"🔧 {name}")
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def on_tool_result(self, name: str, result_preview: str) -> None:
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lines = result_preview.split("\n")
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if len(lines) > 8:
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result_preview = (
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"\n".join(lines[:8])
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+ f"\n … ({len(lines)} lines total)"
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)
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self._append(f" ↳ {result_preview}")
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"""Suppressed by default — tool results don't clutter the chat."""
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pass
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def on_agent_done(self, final_text: str) -> None:
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self._set_status("") # clear the status bar
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self._append(f"⟩ Angel\n{final_text}")
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self._append("─" * 60)
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self._append("✨ Ready")
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self._busy = False