Tags redo (#624)

Introduction of `tag` and `itags`

common/space_index.ts

@@ -0,0 +1,30 @@
+import { DataStore } from "../plugos/lib/datastore.ts";
+import { System } from "../plugos/system.ts";
+
+const indexVersionKey = ["$indexVersion"];
+
+// Bump this one every time a full reinxex is needed
+const desiredIndexVersion = 2;
+
+let indexOngoing = false;
+
+export async function ensureSpaceIndex(ds: DataStore, system: System<any>) {
+  const currentIndexVersion = await ds.get(indexVersionKey);
+
+  console.info("Current space index version", currentIndexVersion);
+
+  if (currentIndexVersion !== desiredIndexVersion && !indexOngoing) {
+    console.info("Performing a full space reindex, this could take a while...");
+    indexOngoing = true;
+    await system.loadedPlugs.get("index")!.invoke("reindexSpace", []);
+    console.info("Full space index complete.");
+    await markFullSpaceIndexComplete(ds);
+    indexOngoing = false;
+  } else {
+    console.info("Space index is up to date");
+  }
+}
+
+export async function markFullSpaceIndexComplete(ds: DataStore) {
+  await ds.set(indexVersionKey, desiredIndexVersion);
+}