Added BackupUnit.cs becauase Git ?????

IllusionInjector/Updating/Backup/BackupUnit.cs

@@ -0,0 +1,126 @@
+using System;
+using System.Collections.Generic;
+using System.Collections.Specialized;
+using System.IO;
+using System.Linq;
+using System.Text;
+
+namespace IllusionInjector.Updating.Backup
+{
+    /// <summary>
+    /// A unit for backup. WIP.
+    /// </summary>
+    internal class BackupUnit
+    {
+        public string Name { get; private set; }
+
+        private DirectoryInfo _BackupPath;
+        private List<string> _Files = new List<string>();
+
+
+
+        public BackupUnit(string backupPath) : this(backupPath, DateTime.Now.ToString("yyyy-MM-dd_h-mm-ss"))
+        {
+        }
+
+        public BackupUnit(string backupPath, string name)
+        {
+            Name = name;
+            _BackupPath = new DirectoryInfo(Path.Combine(backupPath, Name));
+        }
+        
+        public static BackupUnit FromDirectory(DirectoryInfo directory, string backupPath)
+        {
+            var unit = new BackupUnit(backupPath, directory.Name);
+
+            // Parse directory
+            foreach(var file in directory.GetFiles("*", SearchOption.AllDirectories)) {
+                var relativePath = file.FullName.Substring(directory.FullName.Length + 1);
+                unit._Files.Add(relativePath);
+            }
+
+            return unit;
+        }
+
+        public void Add(string file)
+        {
+            Add(new FileInfo(file));
+        }
+
+        internal void Delete()
+        {
+            _BackupPath.Delete(true);
+        }
+
+        /// <summary>
+        /// Adds a file to the list of changed files and backups it.
+        /// </summary>
+        /// <param name="path"></param>
+        public void Add(FileInfo file)
+        {
+            /*if(!file.FullName.StartsWith(_Context.ProjectRoot))
+            {
+                Console.Error.WriteLine("Invalid file path for backup! {0}", file);
+                return;
+            }*/
+
+            var relativePath = new Uri(Environment.CurrentDirectory, UriKind.Absolute).MakeRelativeUri(new Uri(file.FullName)).ToString();//file.FullName.Substring(_Context.ProjectRoot.Length + 1);
+            var backupPath = new FileInfo(Path.Combine(_BackupPath.FullName, relativePath));
+            
+            if(_Files.Contains(relativePath))
+            {
+                Console.WriteLine("Skipping backup of {0}", relativePath);
+                return;
+            }
+
+
+            // Copy over
+            backupPath.Directory.Create();
+            if (file.Exists)
+            {
+                file.CopyTo(backupPath.FullName);
+            } else
+            {
+                // Make empty file
+                backupPath.Create().Close();
+            }
+
+            // Add to list
+            _Files.Add(relativePath);
+        }
+
+        /// <summary>
+        /// Reverts the changes made in this unit.
+        /// </summary>
+        public void Restore()
+        {
+            foreach(var relativePath in _Files)
+            {
+                Console.WriteLine("Restoring {0}", relativePath);
+                // Original version
+                var backupFile = new FileInfo(Path.Combine(_BackupPath.FullName, relativePath));
+                var target = new FileInfo(Path.Combine(Environment.CurrentDirectory, relativePath));
+
+                if (backupFile.Exists)
+                {
+                    if (backupFile.Length > 0)
+                    {
+                        Console.WriteLine("  {0} => {1}", backupFile.FullName, target.FullName);
+                        target.Directory.Create();
+                        backupFile.CopyTo(target.FullName, true);
+                    } else
+                    {
+                        Console.WriteLine("  x {0}", target.FullName);
+                        if(target.Exists)
+                        {
+                            target.Delete();
+                        }
+                    }
+                } else {
+                    Console.Error.WriteLine("Backup not found!");
+                }
+            }
+        }
+
+    }
+}