| 1 | interface ThreadDismissal { |
| 2 | readonly finished: Promise<void>; |
| 3 | readonly restore: () => void; |
| 4 | } |
| 5 | |
| 6 | const rows = new Map<string, Set<() => ThreadDismissal>>(); |
| 7 | |
| 8 | /** A thread can be visible in Home and the navigation sidebar at once. */ |
| 9 | export function registerThreadDismissal(key: string, dismiss: () => ThreadDismissal) { |
| 10 | const registrations = rows.get(key) ?? new Set(); |
| 11 | registrations.add(dismiss); |
| 12 | rows.set(key, registrations); |
| 13 | return () => { |
| 14 | registrations.delete(dismiss); |
| 15 | if (registrations.size === 0) rows.delete(key); |
| 16 | }; |
| 17 | } |
| 18 | |
| 19 | /** Finish the exit before mutating the list; failed commands put the rows back. */ |
| 20 | export async function withThreadDismissal<T>( |
| 21 | key: string, |
| 22 | action: () => Promise<T>, |
| 23 | succeeded: (result: T) => boolean, |
| 24 | ): Promise<T> { |
| 25 | const dismissals = Array.from(rows.get(key) ?? [], (dismiss) => dismiss()); |
| 26 | let committed = false; |
| 27 | try { |
| 28 | await Promise.all(dismissals.map(({ finished }) => finished)); |
| 29 | const result = await action(); |
| 30 | committed = succeeded(result); |
| 31 | return result; |
| 32 | } finally { |
| 33 | if (!committed) dismissals.forEach(({ restore }) => restore()); |
| 34 | } |
| 35 | } |