Function ChatInput

src/cli/components/chat-input.tsx:41–262

(props: ChatInputProps)

 * them so there's no double-handling.
 */
export function ChatInput(props: ChatInputProps): React.ReactElement {
  const {
    value, onChange, onSubmit, cwd, placeholder,
    accentColor = 'cyan', prefix, active = true, busy = false, historyRef,
  } = props;
  const [cursor, setCursor] = useState(value.length);
  const [anchor, setAnchor] = useState<number | null>(null); // selection start, or null
  const [attachments, setAttachments] = useState<Attachment[]>([]);
  const histIdx = useRef<number | null>(null);
  const draft = useRef('');

  // Keep the cursor in range if `value` is changed from the outside (Esc clears,
  // history recall sets a new string, type-ahead resets to '').
  useEffect(() => {
    setCursor(c => Math.max(0, Math.min(c, value.length)));
    setAnchor(null);
  }, [value]);

  const apply = (t: string, c: number) => {
    onChange(t);
    setCursor(Math.max(0, Math.min(c, t.length)));
    setAnchor(null);       // any edit collapses the selection
    histIdx.current = null; // and drops out of history-recall mode
  };

  // Selection = the half-open range [min(anchor,cursor), max(anchor,cursor)).
  const hasSelection = anchor !== null && anchor !== cursor;
  const selFrom = anchor === null ? cursor : Math.min(anchor, cursor);
  const selTo = anchor === null ? cursor : Math.max(anchor, cursor);

  const clearAll = () => {
    onChange('');
    setCursor(0);
    setAnchor(null);
    setAttachments([]);
    histIdx.current = null;
  };

  const submit = () => {
    const parts: string[] = [];
    if (value.trim()) parts.push(value);
    for (const a of attachments) parts.push(a.payload);
    const full = parts.join('\n').trim();
    if (!full) return;
    onSubmit(full);
    onChange('');
    setCursor(0);
    setAnchor(null);
    setAttachments([]);
    histIdx.current = null;
  };

  useInput((input, key) => {
    if (!active) return;
    if (key.ctrl && input === 'c') return; // parent: interrupt / exit

    // Esc: while busy, let the parent abort the run. While idle, clear the
    // typed text AND any paste/image chips (this is what "Esc removes the