importer chnges

KJamsClone/Library.swift

@@ -627,3 +627,14 @@ extension Library {
         try execute("UPDATE songs SET title=?,artist=?,album=?,track_number=?,rendition=?,metadata_edited=? WHERE id=?",[value.title,value.artist,value.album,value.track,value.rendition,String(edited),String(id)])
     }
 }
+
+struct LibraryPage {
+    static let size = 20
+    let total: Int
+    let count: Int
+    let number: Int
+    var range: Range<Int> { let start = number*Self.size;return start..<min(total,start+Self.size) }
+    init(total:Int,requested:Int) {
+        self.total = max(0,total);count = max(1,(max(0,total)+Self.size-1)/Self.size);number = min(count-1,max(0,requested))
+    }
+}