Add project files.

OneDriveArchiver/IoHelper.cs

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+#region Using Statements
+using System;
+using System.IO;
+
+#endregion
+
+namespace OneDriveArchiver
+{
+    public static class IoHelper
+    {
+        /// <summary>
+        /// Archives a one drive file. It takes the file creation date and month,
+        /// creates the necessary folder structure (if necessary) i.e. Year\Month and
+        /// moves the file to the (new) target folder. The Sync engine of OneDrive then
+        /// will sync the changes being made back to the cloud. Base Path is the path where
+        /// the file was found. So the subfolder will start in the same directory.
+        /// </summary>
+        /// <param name="filename">Filename</param>
+        public static void ArchiveOneDriveFile(string filename)
+        {
+            try
+            {
+                if (string.IsNullOrEmpty(filename))
+                {
+                    throw new ArgumentException("filename cannot be null.");
+                }
+
+                // do a check if the file is empty...
+                FileInfo fi = new FileInfo(filename);
+                if (fi.Length == 0)
+                {
+                    Console.WriteLine($"Deleting file {filename} as it has zero bytes content.");
+                    File.Delete(filename);
+                    return;
+                }
+                var dateModified = File.GetLastWriteTime(filename);
+                var fileMonth = dateModified.Month.ToString("D2");
+                var fileYear = dateModified.Year.ToString();
+                var basePath = Path.GetDirectoryName(filename);
+                var fileNameWithOutPath = Path.GetFileName(filename);
+                
+                // check if we have to create either year or month folder...
+                // start with parent year folder...
+                var fullYearFolderPath = Path.Combine(basePath, fileYear);
+                var fullMonthFolderPath = Path.Combine(Path.Combine(basePath, fileYear), fileMonth);
+                if (!Directory.Exists(fullYearFolderPath))
+                {
+                    Directory.CreateDirectory(fullYearFolderPath);
+                }
+                // then month...
+                if (!Directory.Exists(fullMonthFolderPath))
+                {
+                    Directory.CreateDirectory(fullMonthFolderPath);
+                }
+
+                // then move the file...
+                File.Move(filename, Path.Combine(fullMonthFolderPath, fileNameWithOutPath));
+            }
+            catch (Exception ex)
+            {
+                Console.WriteLine(
+                    $"Exception while backing up onedrive file. Message = {ex.Message}, Stacktrace = {ex.StackTrace}");
+            }
+        }
+    }
+}