start add standard repo utils

postssystem.exposed.commons/src/main/kotlin/com/insanusmokrassar/postssystem/exposed/commons/QueryExtensions.kt

@@ -1,7 +1,22 @@
 package com.insanusmokrassar.postssystem.exposed.commons
 
-import com.insanusmokrassar.postssystem.core.utils.pagination.Pagination
-import com.insanusmokrassar.postssystem.core.utils.pagination.firstIndex
-import org.jetbrains.exposed.sql.Query
+import com.insanusmokrassar.postssystem.utils.repos.pagination.*
+import org.jetbrains.exposed.sql.*
 
-fun Query.paginate(pagination: Pagination) = limit(pagination.size, pagination.firstIndex.toLong())
+fun Query.paginate(with: Pagination, orderBy: Pair<Expression<*>, SortOrder>? = null) = limit(
+    with.size,
+    (if (orderBy ?.second == SortOrder.DESC) {
+        with.lastIndex
+    } else {
+        with.firstIndex
+    }).toLong()
+).let {
+    if (orderBy != null) {
+        it.orderBy(
+            orderBy.first,
+            orderBy.second
+        )
+    } else {
+        it
+    }
+}