add base scheduling

src/commonMain/kotlin/com/github/insanusmokrassar/krontab/CronDateTime.kt

@@ -46,34 +46,3 @@ data class CronDateTime(
         )
     }
 }
-
-fun CronDateTime.toNearDateTime(relativelyTo: DateTime = DateTime.now()): DateTime {
-    var current = relativelyTo
-
-    seconds?.let {
-        val left = it - current.seconds
-        current += DateTimeSpan(minutes = if (left < 0) 1 else 0, seconds = left)
-    }
-
-    minutes?.let {
-        val left = it - current.minutes
-        current += DateTimeSpan(hours = if (left < 0) 1 else 0, minutes = left)
-    }
-
-    hours?.let {
-        val left = it - current.hours
-        current += DateTimeSpan(days = if (left < 0) 1 else 0, hours = left)
-    }
-
-    klockDayOfMonth ?.let {
-        val left = it - current.dayOfMonth
-        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
-    }
-
-    month ?.let {
-        val left = it - current.month0
-        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
-    }
-
-    return current
-}

src/commonMain/kotlin/com/github/insanusmokrassar/krontab/CronDateTimeScheduler.kt

@@ -0,0 +1,22 @@
+package com.github.insanusmokrassar.krontab
+
+import com.soywiz.klock.DateTime
+import kotlinx.coroutines.delay
+
+private val anyCronDateTime by lazy {
+    CronDateTime()
+}
+
+data class CronDateTimeScheduler(
+    internal val cronDateTimes: List<CronDateTime>
+)
+
+internal fun CronDateTimeScheduler.next(relatively: DateTime = DateTime.now()): DateTime {
+    return cronDateTimes.map { it.toNearDateTime(relatively) }.min() ?: anyCronDateTime.toNearDateTime(relatively)
+}
+
+suspend fun CronDateTimeScheduler.doInLoop(block: () -> Boolean) {
+    do {
+        delay(next().unixMillisLong - DateTime.now().unixMillisLong)
+    } while (block())
+}

src/commonMain/kotlin/com/github/insanusmokrassar/krontab/Scheduler.kt

@@ -1,3 +1,37 @@
 package com.github.insanusmokrassar.krontab
 
+import com.soywiz.klock.DateTime
+import com.soywiz.klock.DateTimeSpan
 
+
+
+fun CronDateTime.toNearDateTime(relativelyTo: DateTime = DateTime.now()): DateTime {
+    var current = relativelyTo
+
+    seconds?.let {
+        val left = it - current.seconds
+        current += DateTimeSpan(minutes = if (left < 0) 1 else 0, seconds = left)
+    }
+
+    minutes?.let {
+        val left = it - current.minutes
+        current += DateTimeSpan(hours = if (left < 0) 1 else 0, minutes = left)
+    }
+
+    hours?.let {
+        val left = it - current.hours
+        current += DateTimeSpan(days = if (left < 0) 1 else 0, hours = left)
+    }
+
+    klockDayOfMonth ?.let {
+        val left = it - current.dayOfMonth
+        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
+    }
+
+    month ?.let {
+        val left = it - current.month0
+        current += DateTimeSpan(months = if (left < 0) 1 else 0, days = left)
+    }
+
+    return current
+}