asFlow extension

src/commonMain/kotlin/com/insanusmokrassar/krontab/utils/SchedulerFlow.kt

@@ -0,0 +1,25 @@
+package com.insanusmokrassar.krontab.utils
+
+import com.insanusmokrassar.krontab.KronScheduler
+import com.soywiz.klock.DateTime
+import kotlinx.coroutines.*
+import kotlinx.coroutines.flow.*
+
+@FlowPreview
+fun KronScheduler.asFlow(): Flow<DateTime> = SchedulerFlow(this)
+
+@FlowPreview
+class SchedulerFlow(
+    private val scheduler: KronScheduler
+) : AbstractFlow<DateTime>() {
+    @FlowPreview
+    override suspend fun collectSafely(collector: FlowCollector<DateTime>) {
+        while (true) {
+            val now = DateTime.now()
+            val nextTime = scheduler.next(now)
+            val sleepDelay = (nextTime - now).millisecondsLong
+            delay(sleepDelay)
+            collector.emit(nextTime)
+        }
+    }
+}