add PIN kind utilities

packages/app/src/pins.ts

@@ -0,0 +1,28 @@
+import {PINS, asDecryptedEvent, readList} from "@welshman/util"
+import {type TrustedEvent, type PublishedList} from "@welshman/util"
+import {type SubscribeRequestWithHandlers} from "@welshman/net"
+import {deriveEventsMapped} from "@welshman/store"
+import {repository} from "./core.js"
+import {load} from "./subscribe.js"
+import {collection} from "./collection.js"
+import {loadRelaySelections} from "./relaySelections.js"
+
+export const pins = deriveEventsMapped<PublishedList>(repository, {
+  filters: [{kinds: [PINS]}],
+  itemToEvent: item => item.event,
+  eventToItem: (event: TrustedEvent) => readList(asDecryptedEvent(event)),
+})
+
+export const {
+  indexStore: pinsByPubkey,
+  deriveItem: derivePins,
+  loadItem: loadPins,
+} = collection({
+  name: "pins",
+  store: pins,
+  getKey: pins => pins.event.pubkey,
+  load: async (pubkey: string, request: Partial<SubscribeRequestWithHandlers> = {}) => {
+    await loadRelaySelections(pubkey, request)
+    await load({...request, filters: [{kinds: [PINS], authors: [pubkey]}]})
+  },
+})