Ship extension queues, library extend, and smoother seam stitching.

Users can pre-queue extensions, extend from the library with p2 titles, blend seams with xfade, and a unreadable catalog is no longer replaced with an empty one.

Co-authored-by: Cursor <cursoragent@cursor.com>

server/utils/library.ts

@@ -57,6 +57,11 @@ export interface PublicFolder {
   clipCount: number
 }
 
+export interface QueuedExtension {
+  prompt: string
+  duration: number
+}
+
 export interface RetryDraft {
   id: string
   createdAt: number
@@ -79,6 +84,7 @@ export interface RetryDraft {
   fps?: number
   samplerName?: string
   scheduler?: string
+  extensions?: QueuedExtension[]
 }
 
 interface Catalog {
@@ -198,11 +204,15 @@ function ensureOwner(owner: string) {
 
 function readCatalog(owner: string): Catalog {
   ensureOwner(owner)
+  const path = catalogPath(owner)
   try {
-    return normalizeCatalog(JSON.parse(readFileSync(catalogPath(owner), 'utf8')))
+    return normalizeCatalog(JSON.parse(readFileSync(path, 'utf8')))
   } catch {
+    if (existsSync(path)) {
+      throw createError({ statusCode: 500, statusMessage: 'Library catalog could not be read' })
+    }
     const created = emptyCatalog()
-    writeFileSync(catalogPath(owner), JSON.stringify(created, null, 2))
+    writeFileSync(path, JSON.stringify(created, null, 2))
     return created
   }
 }
@@ -233,6 +243,16 @@ export function clipTitle(clip: Pick<LibraryClip, 'name' | 'prompt'>) {
   return fromPrompt || 'Untitled clip'
 }
 
+export function nextClipPartName(name: string) {
+  const trimmed = (name || '').trim()
+  if (!trimmed) return ''
+  const match = trimmed.match(/^(.*)\s+p(\d+)$/i)
+  const base = (match ? match[1] : trimmed).trim() || trimmed
+  const part = match ? Number(match[2]) + 1 : 2
+  const suffix = ` p${part}`
+  return `${base.slice(0, Math.max(1, 80 - suffix.length))}${suffix}`
+}
+
 export function safeDownloadName(name: string) {
   const cleaned = name.replace(/[<>:"/\\|?*'`\u0000-\u001f]/g, '-').replace(/\s+/g, ' ').trim()
   return cleaned.slice(0, 80) || 'aigen'
@@ -689,6 +709,7 @@ export async function saveRetryDraft(params: {
   fps?: number
   samplerName?: string
   scheduler?: string
+  extensions?: QueuedExtension[]
 }) {
   return mutate(params.ownerKey, (catalog) => {
     const existing = params.id ? catalog.drafts.find(item => item.id === params.id) : undefined
@@ -713,7 +734,8 @@ export async function saveRetryDraft(params: {
       cfg: params.cfg,
       fps: params.fps,
       samplerName: params.samplerName,
-      scheduler: params.scheduler
+      scheduler: params.scheduler,
+      extensions: params.extensions?.length ? params.extensions : undefined
     }
     catalog.drafts = [draft, ...catalog.drafts.filter(item => item.id !== draft.id)].slice(0, 20)
     return draft