fix #418: File rename can break project file. The SVN AddIn should check if the rename operation is legal before attempting to rename a file.

src/AddIns/VersionControl/SubversionAddIn/Src/Commands/AutostartCommands.cs

@@ -389,6 +389,10 @@ namespace ICSharpCode.Svn.Commands
 			if (!AddInOptions.AutomaticallyRenameFiles) return;
 			string fullSource = Path.GetFullPath(e.SourceFile);
 			if (!CanBeVersionControlledFile(fullSource)) return;
+			if (!FileHelpers.CheckRenameOrReplacePossible(e)) {
+				e.Cancel = true;
+				return;
+			}
 			try {
 				using (SvnClientWrapper client = new SvnClientWrapper()) {
 					SvnMessageView.HandleNotifications(client);

src/Main/Base/Project/ICSharpCode.SharpDevelop.csproj

@@ -366,6 +366,7 @@
     <Compile Include="Workbench\DisplayBinding\ISecondaryDisplayBinding.cs" />
     <Compile Include="Workbench\FakeXmlViewContent.cs" />
     <Compile Include="Workbench\FileChangeWatcher.cs" />
+    <Compile Include="Workbench\File\FileHelpers.cs" />
     <Compile Include="Workbench\File\FileService.cs" />
     <Compile Include="Workbench\File\IRecentOpen.cs" />
     <Compile Include="Workbench\ICustomizedCommands.cs" />

src/Main/Base/Project/Workbench/File/FileHelpers.cs

@@ -0,0 +1,49 @@
+// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
+// 
+// Permission is hereby granted, free of charge, to any person obtaining a copy of this
+// software and associated documentation files (the "Software"), to deal in the Software
+// without restriction, including without limitation the rights to use, copy, modify, merge,
+// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
+// to whom the Software is furnished to do so, subject to the following conditions:
+// 
+// The above copyright notice and this permission notice shall be included in all copies or
+// substantial portions of the Software.
+// 
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
+// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
+// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+// DEALINGS IN THE SOFTWARE.
+
+using System;
+using System.IO;
+using ICSharpCode.Core;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	/// <summary>
+	/// Utility/helper methods for IFileService to avoid changing the IFileService interface.
+	/// </summary>
+	public static class FileHelpers
+	{
+		/// <summary>
+		/// Checks that the rename/overwrite operation is possible.
+		/// </summary>
+		public static bool CheckRenameOrReplacePossible(FileRenameEventArgs e, bool replaceAllowed = false)
+		{
+			if (e.IsDirectory && Directory.Exists(e.SourceFile)) {
+				if (!replaceAllowed && Directory.Exists(e.TargetFile)) {
+					SD.MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
+					return false;
+				}
+			} else if (File.Exists(e.SourceFile)) {
+				if (!replaceAllowed && File.Exists(e.TargetFile)) {
+					SD.MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
+					return false;
+				}
+			}
+			return true;
+		}
+	}
+}

src/Main/SharpDevelop/Workbench/FileService.cs

@@ -580,20 +580,12 @@ namespace ICSharpCode.SharpDevelop.Workbench
 					return false;
 				if (!eargs.OperationAlreadyDone) {
 					try {
-						if (isDirectory && Directory.Exists(oldName)) {
-							
-							if (Directory.Exists(newName)) {
-								MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
-								return false;
+						if (FileHelpers.CheckRenameOrReplacePossible(eargs)) {
+							if (isDirectory) {
+								Directory.Move(oldName, newName);
+							} else {
+								File.Move(oldName, newName);
 							}
-							Directory.Move(oldName, newName);
-							
-						} else if (File.Exists(oldName)) {
-							if (File.Exists(newName)) {
-								MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
-								return false;
-							}
-							File.Move(oldName, newName);
 						}
 					} catch (Exception e) {
 						if (isDirectory) {
@@ -624,20 +616,12 @@ namespace ICSharpCode.SharpDevelop.Workbench
 				return false;
 			if (!eargs.OperationAlreadyDone) {
 				try {
-					if (isDirectory && Directory.Exists(oldName)) {
-						
-						if (!overwrite && Directory.Exists(newName)) {
-							MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
-							return false;
-						}
-						FileUtility.DeepCopy(oldName, newName, overwrite);
-						
-					} else if (File.Exists(oldName)) {
-						if (!overwrite && File.Exists(newName)) {
-							MessageService.ShowMessage(StringParser.Parse("${res:Gui.ProjectBrowser.FileInUseError}"));
-							return false;
+					if (FileHelpers.CheckRenameOrReplacePossible(eargs, overwrite)) {
+						if (isDirectory) {
+							FileUtility.DeepCopy(oldName, newName, overwrite);
+						} else {
+							File.Copy(oldName, newName, overwrite);
 						}
-						File.Copy(oldName, newName, overwrite);
 					}
 				} catch (Exception e) {
 					if (isDirectory) {