Function useMessageActions

src/components/messageActions.tsx:217–271

(cursor: MessageActionsState | null, setCursor: React.Dispatch<React.SetStateAction<MessageActionsState | null>>, navRef: RefObject<MessageActionsNav | null>, caps: MessageActionCaps)

// Can't call useKeybindings here — hook runs outside <KeybindingSetup> provider. Returns handlers instead.
export function useMessageActions(cursor: MessageActionsState | null, setCursor: React.Dispatch<React.SetStateAction<MessageActionsState | null>>, navRef: RefObject<MessageActionsNav | null>, caps: MessageActionCaps): {
  enter: () => void;
  handlers: Record<string, () => void>;
} {
  // Refs keep handlers stable — no useKeybindings re-register per message append.
  const cursorRef = useRef(cursor);
  cursorRef.current = cursor;
  const capsRef = useRef(caps);
  capsRef.current = caps;
  const handlers = useMemo(() => {
    const h: Record<string, () => void> = {
      'messageActions:prev': () => navRef.current?.navigatePrev(),
      'messageActions:next': () => navRef.current?.navigateNext(),
      'messageActions:prevUser': () => navRef.current?.navigatePrevUser(),
      'messageActions:nextUser': () => navRef.current?.navigateNextUser(),
      'messageActions:top': () => navRef.current?.navigateTop(),
      'messageActions:bottom': () => navRef.current?.navigateBottom(),
      'messageActions:escape': () => setCursor(c => c?.expanded ? {
        ...c,
        expanded: false
      } : null),
      // ctrl+c skips the collapse step — from expanded-during-streaming, two-stage
      // would mean 3 presses to interrupt (collapse→null→cancel).
      'messageActions:ctrlc': () => setCursor(null)
    };
    for (const key of new Set(MESSAGE_ACTIONS.map(a_1 => a_1.key))) {
      h[`messageActions:${key}`] = () => {
        const c_0 = cursorRef.current;
        if (!c_0) return;
        const a_0 = MESSAGE_ACTIONS.find(a => a.key === key && isApplicable(a, c_0));
        if (!a_0) return;
        if (a_0.stays) {
          setCursor(c_1 => c_1 ? {
            ...c_1,
            expanded: !c_1.expanded
          } : null);
          return;
        }
        const m = navRef.current?.getSelected();
        if (!m) return;
        (a_0.run as (m: NavigableMessage, c_0: MessageActionCaps) => void)(m, capsRef.current);
        setCursor(null);
      };
    }
    return h;
  }, [setCursor, navRef]);
  const enter = useCallback(() => {
    logEvent('tengu_message_actions_enter', {});
    navRef.current?.enterCursor();
  }, [navRef]);
  return {
    enter,
    handlers
  };
}

// Must mount inside <KeybindingSetup>.
export function MessageActionsKeybindings(t0) {