Add automatic gallery updating

app/src/main/java/exh/util/RxUtil.kt

@@ -1,8 +1,11 @@
 package exh.util
 
-import rx.Observable
-import rx.Single
+import com.pushtorefresh.storio.operations.PreparedOperation
+import com.pushtorefresh.storio.sqlite.operations.get.PreparedGetObject
+import kotlinx.coroutines.suspendCancellableCoroutine
+import rx.*
 import rx.subjects.ReplaySubject
+import kotlin.coroutines.resumeWithException
 
 /**
  * Transform a cold single to a hot single
@@ -24,4 +27,45 @@ fun <T> Observable<T>.melt(): Observable<T> {
     val rs = ReplaySubject.create<T>()
     subscribe(rs)
     return rs
-}
+}
+
+suspend fun <T> Single<T>.await(subscribeOn: Scheduler? = null): T {
+    return suspendCancellableCoroutine { continuation ->
+        val self = if (subscribeOn != null) subscribeOn(subscribeOn) else this
+        lateinit var sub: Subscription
+        sub = self.subscribe({
+            continuation.resume(it) {
+                sub.unsubscribe()
+            }
+        }, {
+            if (!continuation.isCancelled)
+                continuation.resumeWithException(it)
+        })
+
+        continuation.invokeOnCancellation {
+            sub.unsubscribe()
+        }
+    }
+}
+
+suspend fun <T> PreparedOperation<T>.await(): T = asRxSingle().await()
+suspend fun <T> PreparedGetObject<T>.await(): T? = asRxSingle().await()
+
+suspend fun Completable.awaitSuspending(subscribeOn: Scheduler? = null) {
+    return suspendCancellableCoroutine { continuation ->
+        val self = if (subscribeOn != null) subscribeOn(subscribeOn) else this
+        lateinit var sub: Subscription
+        sub = self.subscribe({
+            continuation.resume(Unit) {
+                sub.unsubscribe()
+            }
+        }, {
+            if (!continuation.isCancelled)
+                continuation.resumeWithException(it)
+        })
+
+        continuation.invokeOnCancellation {
+            sub.unsubscribe()
+        }
+    }
+}