display links to the stacked note

src/hooks/useBacklinks.hook.ts

@@ -0,0 +1,36 @@
+import { backlinkEventBus } from '@/bus/backlinkEventBus'
+import { data } from '@/data/data'
+import { DataType } from '@/data/DataType.enum'
+import { BacklinkNote } from '@/modules/note/models/BacklinkNote'
+import { useAsyncState } from '@vueuse/core'
+import { onUnmounted } from 'vue'
+
+export const useBacklinks = (sha: string) => {
+  const backlink = useAsyncState(
+    data.get<DataType.BacklinkNote, BacklinkNote>(
+      data.generateId(DataType.BacklinkNote, sha)
+    ),
+    null,
+    {
+      resetOnExecute: true
+    }
+  )
+
+  const unsubscribe = backlinkEventBus.addEventBusListener(
+    ({ fileSha }) => {
+      if (fileSha !== sha) {
+        return
+      }
+      backlink.execute()
+    },
+    {
+      retro: true
+    }
+  )
+
+  onUnmounted(() => unsubscribe())
+
+  return {
+    backlink
+  }
+}