Fixes #129: add "attachment" query source (#239)

plugs/core/attachment.ts

@@ -0,0 +1,7 @@
+import { QueryProviderEvent } from "$sb/app_event.ts";
+import { applyQuery } from "$sb/lib/query.ts";
+import { space } from "$sb/silverbullet-syscall/mod.ts";
+
+export async function attachmentQueryProvider({ query }: QueryProviderEvent) {
+  return applyQuery(query, await space.listAttachments());
+}

plugs/core/core.plug.yaml

@@ -66,6 +66,12 @@ functions:
     command:
       name: "Editor: Toggle Read Only Mode"
 
+  # Attachments
+  attachmentQueryProvider:
+    path: ./attachment.ts:attachmentQueryProvider
+    events:
+      - query:attachment
+
   # Backlinks
   indexLinks:
     path: "./page.ts:indexLinks"