Function undoAvailabilityFromContext

apps/kimi-code/src/tui/commands/undo.ts:214–232

(
  history: readonly ContextMessage[],
)

}

function undoAvailabilityFromContext(
  history: readonly ContextMessage[],
): UndoAvailability {
  let maxCount = 0;
  let stoppedAtCompaction = false;

  for (let i = history.length - 1; i >= 0; i--) {
    const message = history[i];
    if (message === undefined) continue;
    if (message.origin?.kind === 'injection') continue;
    if (message.origin?.kind === 'compaction_summary') {
      stoppedAtCompaction = true;
      break;
    }
    if (isContextUndoAnchor(message)) maxCount++;
  }

  return { maxCount, stoppedAtCompaction };
}

function isContextUndoAnchor(message: ContextMessage): boolean {
  if (message.role !== 'user') return false;