New OpenedFile API based on file models.

src/AddIns/DisplayBindings/AvalonEdit.AddIn/Src/Utils.cs

@@ -28,22 +28,6 @@ namespace ICSharpCode.AvalonEdit.AddIn
 {
 	public static class Utils
 	{
-		public static OffsetChangeMap ToOffsetChangeMap(this IEnumerable<Edit> edits)
-		{
-			var map = new OffsetChangeMap();
-			int diff = 0;
-			foreach (var edit in edits) {
-				Debug.Assert(edit.EditType != ChangeType.None && edit.EditType != ChangeType.Unsaved);
-				int offset = edit.BeginA + diff;
-				int removalLength = edit.EndA - edit.BeginA;
-				int insertionLength = edit.EndB - edit.BeginB;
-				
-				diff += (insertionLength - removalLength);
-				map.Add(new OffsetChangeMapEntry(offset, removalLength, insertionLength));
-			}
-			return map;
-		}
-		
 		/// <summary>
 		/// Copies editor options and default element customizations.
 		/// Does not copy the syntax highlighting.

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

@@ -361,8 +361,13 @@
     <Compile Include="Workbench\DisplayBinding\ISecondaryDisplayBinding.cs" />
     <Compile Include="Workbench\FakeXmlViewContent.cs" />
     <Compile Include="Workbench\FileChangeWatcher.cs" />
+    <Compile Include="Workbench\File\BinaryFileModelProvider.cs" />
+    <Compile Include="Workbench\File\DocumentFileModelInfo.cs" />
+    <Compile Include="Workbench\File\FileModels.cs" />
     <Compile Include="Workbench\File\FileService.cs" />
+    <Compile Include="Workbench\File\IFileModelProvider.cs" />
     <Compile Include="Workbench\File\IRecentOpen.cs" />
+    <Compile Include="Workbench\File\TextDocumentFileModelProvider.cs" />
     <Compile Include="Workbench\ICustomizedCommands.cs" />
     <Compile Include="Workbench\IOutputPad.cs" />
     <Compile Include="Workbench\IPadContent.cs" />

src/Main/Base/Project/Services/IFileSystem.cs

@@ -34,10 +34,10 @@ namespace ICSharpCode.SharpDevelop
 		/// <inheritdoc cref="System.IO.File.Delete"/>
 		void Delete(FileName path);
 		
-		/// <inheritdoc cref="System.IO.File.CopyFile"/>
+		/// <inheritdoc cref="System.IO.File.Copy(string, string, bool)"/>
 		void CopyFile(FileName source, FileName destination, bool overwrite = false);
 		
-		/// <inheritdoc cref="System.IO.Directory.Delete"/>
+		/// <inheritdoc cref="System.IO.Directory.CreateDirectory"/>
 		void CreateDirectory(DirectoryName path);
 		
 		/// <inheritdoc cref="System.IO.File.OpenWrite"/>
@@ -69,10 +69,13 @@ namespace ICSharpCode.SharpDevelop
 		/// Options that influence the search.
 		/// </param>
 		/// <returns>An enumerable that iterates through the directory contents</returns>
-		/// <exception cref="IOExcption">The directory does not exist / access is denied.</exception>
+		/// <exception cref="IOException">The directory does not exist / access is denied.</exception>
 		IEnumerable<FileName> GetFiles(DirectoryName directory, string searchPattern = "*", DirectorySearchOptions searchOptions = DirectorySearchOptions.None);
 	}
 	
+	/// <summary>
+	/// Options for <c>SD.FileSystem.GetFiles()</c>.
+	/// </summary>
 	[Flags]
 	public enum DirectorySearchOptions
 	{

src/Main/Base/Project/Util/SharpDevelopExtensions.cs

@@ -28,6 +28,7 @@ using System.Windows.Controls;
 using System.Windows.Media;
 using System.Xml;
 using System.Xml.Linq;
+using ICSharpCode.AvalonEdit.Document;
 using ICSharpCode.Core;
 using ICSharpCode.Core.Presentation;
 using ICSharpCode.NRefactory;
@@ -36,6 +37,7 @@ using ICSharpCode.NRefactory.TypeSystem;
 using ICSharpCode.SharpDevelop.Dom;
 using ICSharpCode.SharpDevelop.Parser;
 using ICSharpCode.SharpDevelop.Project;
+using ICSharpCode.SharpDevelop.Workbench;
 
 namespace ICSharpCode.SharpDevelop
 {
@@ -1028,6 +1030,14 @@ namespace ICSharpCode.SharpDevelop
 			return document.GetText(startOffset, document.GetOffset(endPos) - startOffset);
 		}
 		
+		/// <summary>
+		/// Retrieves the DocumentFileModelInfo associated with this TextDocument.
+		/// </summary>
+		public static DocumentFileModelInfo GetFileModelInfo(this TextDocument document)
+		{
+			return document.GetService<DocumentFileModelInfo>();
+		}
+		
 		/// <summary>
 		/// Obsolete. Use GetOffset() instead.
 		/// </summary>

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

@@ -0,0 +1,72 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.IO;
+using ICSharpCode.Core;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	sealed class BinaryFileModelProvider : IFileModelProvider<IBinaryModel>
+	{
+		sealed class OnDiskBinaryModel : IBinaryModel
+		{
+			internal readonly OpenedFile file;
+			
+			public OnDiskBinaryModel(OpenedFile file)
+			{
+				this.file = file;
+			}
+			
+			public Stream OpenRead()
+			{
+				return SD.FileSystem.OpenRead(file.FileName);
+			}
+		}
+		
+		public IBinaryModel Load(OpenedFile file)
+		{
+			return new OnDiskBinaryModel(file);
+		}
+		
+		public void Save(OpenedFile file, IBinaryModel model)
+		{
+			SaveCopyAs(file, model, file.FileName);
+			file.ReplaceModel(this, model, ReplaceModelMode.SetAsValid); // remove dirty flag
+		}
+		
+		public void SaveCopyAs(OpenedFile file, IBinaryModel model, FileName outputFileName)
+		{
+			var onDisk = model as OnDiskBinaryModel;
+			if (onDisk != null) {
+				// We can just copy the file (but avoid copying to itself)
+				if (onDisk.file.FileName != outputFileName) {
+					SD.FileSystem.CopyFile(onDisk.file.FileName, outputFileName);
+				}
+			} else {
+				using (var inputStream = model.OpenRead()) {
+					using (var outputStream = SD.FileSystem.OpenWrite(outputFileName)) {
+						inputStream.CopyTo(outputStream);
+					}
+				}
+			}
+		}
+		
+		public bool CanLoadFrom<U>(IFileModelProvider<U> otherProvider) where U : class
+		{
+			return false;
+		}
+
+		public void NotifyRename(OpenedFile file, IBinaryModel model, FileName oldName, FileName newName)
+		{
+		}
+		
+		public void NotifyStale(OpenedFile file, IBinaryModel model)
+		{
+		}
+		
+		public void NotifyUnloaded(OpenedFile file, IBinaryModel model)
+		{
+		}
+	}
+}

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

@@ -0,0 +1,29 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Text;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	/// <summary>
+	/// Extra information about a TextDocument that was loaded from an OpenedFile.
+	/// </summary>
+	public class DocumentFileModelInfo
+	{
+		public DocumentFileModelInfo()
+		{
+			this.Encoding = SD.FileService.DefaultFileEncoding;
+		}
+		
+		/// <summary>
+		/// Gets whether the model is stale.
+		/// </summary>
+		public bool IsStale { get; internal set; }
+		
+		/// <summary>
+		/// Gets the encoding of the model.
+		/// </summary>
+		public Encoding Encoding { get; set; }
+	}
+}

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

@@ -0,0 +1,38 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.IO;
+using ICSharpCode.AvalonEdit.Document;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	/// <summary>
+	/// Pre-defined file models.
+	/// </summary>
+	public static class FileModels
+	{
+		/// <summary>
+		/// The binary file model provider.
+		/// </summary>
+		public static readonly IFileModelProvider<IBinaryModel> Binary = new BinaryFileModelProvider();
+		
+		/// <summary>
+		/// The text document file model provider.
+		/// </summary>
+		public static readonly IFileModelProvider<TextDocument> TextDocument = new TextDocumentFileModelProvider();
+	}
+	
+	/// <summary>
+	/// Represents the binary contents of a file.
+	/// </summary>
+	public interface IBinaryModel
+	{
+		/// <summary>
+		/// Creates a stream that reads from the binary model.
+		/// </summary>
+		/// <returns>A readable and seekable stream.</returns>
+		/// <exception cref="IOException">Error opening the file.</exception>
+		Stream OpenRead();
+	}
+}

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

@@ -0,0 +1,76 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using ICSharpCode.Core;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	/// <summary>
+	/// Interface that deals with loading and saving OpenedFile model instances.
+	/// Pre-defined model providers are available in the <see cref="FileModels"/> class.
+	/// Custom IFileModelProvider implementations may be used to add support for additional types of models.
+	/// </summary>
+	public interface IFileModelProvider<T> where T : class
+	{
+		/// <summary>
+		/// Loads a file model from the OpenedFile.
+		/// Most implementations of this method will request a lower-level model (e.g. FileModels.Binary) from the opened file
+		/// and construct a higher-level representation.
+		/// </summary>
+		/// <exception cref="System.IO.IOException">Error loading the file.</exception>
+		/// <exception cref="FormatException">Cannot construct the model because the underyling data is in an invalid format.</exception>
+		T Load(OpenedFile file);
+		
+		/// <summary>
+		/// Saves a file model.
+		/// The file should be saved to a location where a subsequent Load() operation can load from.
+		/// Usually, this means saving to a lower-level model (e.g. a TextDocument model is saved by creating a binary model).
+		/// 
+		/// After the Save() method completes successfully, the specified model may no longer be marked as dirty. For models saving to
+		/// lower-level models, this is done by marking that lower-level model as dirty.
+		/// In other cases, the provider may have to explicitly remove the dirty flag from the model.
+		/// </summary>
+		void Save(OpenedFile file, T model);
+		
+		/// <summary>
+		/// Saves a file model to disk. This method may by-pass lower-level models (such as FileModels.Binary) and directly write to disk.
+		/// Note that this method is supposed to save a copy of the file, without resetting the dirty flag (think "Save Copy As...").
+		/// However, transferring the dirty flag to a lower-level model is allowed.
+		/// </summary>
+		/// <exception cref="System.IO.IOException">Error saving the file.</exception>
+		void SaveCopyAs(OpenedFile file, T model, FileName outputFileName);
+		
+		/// <summary>
+		/// Gets whether this provider can load from the specified other provider.
+		/// It is important that CanLoadFrom() is transitive!
+		/// For a file model provider that loads from a text document model, the implementation should look like this:
+		/// <code>
+		/// return otherProvider == FileModels.TextDocument || FileModels.TextDocument.CanLoadFrom(otherProvider);
+		/// </code>
+		/// </summary>
+		bool CanLoadFrom<U>(IFileModelProvider<U> otherProvider) where U : class;
+		
+		/// <summary>
+		/// Notifies the provider that a file was renamed.
+		/// If the file name is already available as part of the model, the provider is responsible for updating the model.
+		/// </summary>
+		void NotifyRename(OpenedFile file, T model, FileName oldName, FileName newName);
+		
+		/// <summary>
+		/// Notifies the provider that a model was marked as stale.
+		/// </summary>
+		void NotifyStale(OpenedFile file, T model);
+		
+		/// <summary>
+		/// Notifies a model that it became unloaded.
+		/// This can happen due to:
+		/// <list type="items"></list>
+		/// <item>an explicit <see cref="OpenedFile.UnloadModel"/> call</item>
+		/// <item>a <see cref="OpenedFile.ReplaceModel"/> call replacing this model with another</item>
+		/// <item>a <see cref="OpenedFile.GetModel"/> call replacing a stale model with another</item>
+		/// <item>the OpenedFile getting disposed</item>
+		/// </summary>
+		void NotifyUnloaded(OpenedFile file, T model);
+	}
+}

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

@@ -27,21 +27,49 @@ using ICSharpCode.SharpDevelop.Parser;
 namespace ICSharpCode.SharpDevelop.Workbench
 {
 	/// <summary>
-	/// Represents an opened file.
+	/// Options for use with <see cref="OpenedFile.GetModel"/>
 	/// </summary>
-	public abstract class OpenedFile : ICanBeDirty
+	[Flags]
+	public enum GetModelOptions
 	{
-		protected IViewContent currentView;
-		bool inLoadOperation;
-		bool inSaveOperation;
-		
+		None = 0,
 		/// <summary>
-		/// holds unsaved file content in memory when view containing the file was closed but no other view
-		/// activated
+		/// Return stale models without reloading.
 		/// </summary>
-		byte[] fileData;
-		
-		#region IsDirty
+		AllowStale = 1,
+		/// <summary>
+		/// Do not load any models:
+		/// Returns null if the model is not already loaded, or if it is stale and the AllowStale option isn't in use.
+		/// </summary>
+		DoNotLoad = 2,
+	}
+	
+	/// <summary>
+	/// Option that control how <see cref="OpenedFile.ReplaceModel"/> handles the dirty flag.
+	/// </summary>
+	public enum ReplaceModelMode
+	{
+		/// <summary>
+		/// The new model is marked as dirty; and any other models are marked as stale.
+		/// </summary>
+		SetAsDirty,
+		/// <summary>
+		/// The new model is marked as valid; the status of any other models is unchanged.
+		/// </summary>
+		SetAsValid,
+		/// <summary>
+		/// The new model is marked as dirty, the previously dirty model is marked as stale, and any other models are unchanged.
+		/// This mode is intended for use in <see cref="IFileModelProvider{T}.Save"/> implementations.
+		/// </summary>
+		TransferDirty
+	}
+	
+	/// <summary>
+	/// Represents an opened file.
+	/// </summary>
+	public abstract class OpenedFile : ICanBeDirty
+	{
+		#region IsDirty implementation
 		bool isDirty;
 		public event EventHandler IsDirtyChanged;
 		
@@ -50,7 +78,7 @@ namespace ICSharpCode.SharpDevelop.Workbench
 		/// </summary>
 		public bool IsDirty {
 			get { return isDirty;}
-			set {
+			private set {
 				if (isDirty != value) {
 					isDirty = value;
 					
@@ -60,26 +88,16 @@ namespace ICSharpCode.SharpDevelop.Workbench
 				}
 			}
 		}
-		
-		/// <summary>
-		/// Marks the file as dirty if it currently is not in a load operation.
-		/// </summary>
-		public virtual void MakeDirty()
-		{
-			if (!inLoadOperation) {
-				this.IsDirty = true;
-			}
-		}
 		#endregion
 		
-		bool isUntitled;
-		
+		#region FileName
 		/// <summary>
 		/// Gets if the file is untitled. Untitled files show a "Save as" dialog when they are saved.
 		/// </summary>
 		public bool IsUntitled {
-			get { return isUntitled; }
-			protected set { isUntitled = value; }
+			get {
+				return fileName.ToString().StartsWith("untitled:", StringComparison.Ordinal);
+			}
 		}
 		
 		FileName fileName;
@@ -96,6 +114,11 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			}
 		}
 		
+		/// <summary>
+		/// Occurs when the file name has changed.
+		/// </summary>
+		public event EventHandler FileNameChanged;
+		
 		protected virtual void ChangeFileName(FileName newValue)
 		{
 			SD.MainThread.VerifyAccess();
@@ -106,13 +129,112 @@ namespace ICSharpCode.SharpDevelop.Workbench
 				FileNameChanged(this, EventArgs.Empty);
 			}
 		}
+		#endregion
 		
 		/// <summary>
-		/// Occurs when the file name has changed.
+		/// This method sets all models to 'stale', causing the file to be re-loaded from disk
+		/// on the next GetModel() call.
 		/// </summary>
-		public event EventHandler FileNameChanged;
+		/// <exception cref="InvalidOperationException">The file is untitled.</exception>
+		public void ReloadFromDisk()
+		{
+			if (IsUntitled)
+				throw new InvalidOperationException("Cannot reload an untitled file from disk.");
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Saves the file to disk.
+		/// </summary>
+		/// <remarks>If the file is saved successfully, the dirty flag will be cleared (the dirty model becomes valid instead).</remarks>
+		/// <exception cref="InvalidOperationException">The file is untitled.</exception>
+		public void SaveToDisk()
+		{
+			if (IsUntitled)
+				throw new InvalidOperationException("Cannot reload an untitled file from disk.");
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Changes the file name, and saves the file to disk.
+		/// </summary>
+		/// <remarks>If the file is saved successfully, the dirty flag will be cleared (the dirty model becomes valid instead).</remarks>
+		public void SaveToDisk(FileName fileName)
+		{
+			this.FileName = fileName;
+			SaveToDisk();
+		}
+		
+		/// <summary>
+		/// Saves a copy of the file to disk. Does not change the name of the OpenedFile to the specified file name, and does not reset the dirty flag.
+		/// </summary>
+		public void SaveCopyAs(FileName fileName)
+		{
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Retrieves a file model, loading it if necessary.
+		/// </summary>
+		/// <param name="modelProvider">The model provider for the desired model type. Built-in model providers can be found in the <see cref="FileModels"/> class.</param>
+		/// <param name="options">Options that control how</param>
+		/// <returns>The model instance, or possibly <c>null</c> if <c>GetModelOptions.DoNotLoad</c> is in use.</returns>
+		/// <exception cref="IOException">Error loading the file.</exception>
+		/// <exception cref="FormatException">Cannot construct the model because the underyling data is in an invalid format.</exception>
+		public T GetModel<T>(IFileModelProvider<T> modelProvider, GetModelOptions options = GetModelOptions.None) where T : class
+		{
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Sets the model associated with the specified model provider to be dirty.
+		/// All other models are marked as stale. If another model was previously dirty, those earlier changes will be lost.
+		/// </summary>
+		public void MakeDirty<T>(IFileModelProvider<T> modelProvider) where T : class
+		{
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Unloads the model associated with the specified model provider.
+		/// Unloading the dirty model will cause changes to be lost.
+		/// </summary>
+		public void UnloadModel<T>(IFileModelProvider<T> modelProvider) where T : class
+		{
+			throw new NotImplementedException();
+		}
+		
+		/// <summary>
+		/// Replaces the model associated with the specified model provider with a different instance.
+		/// </summary>
+		/// <param name="modelProvider">The model provider for the model type.</param>
+		/// <param name="model">The new model instance.</param>
+		/// <param name="mode">Specifies how the dirty flag is handled during the replacement.
+		/// By default, the new model is marked as dirty and all other models are marked as stale.
+		/// In <see cref="IFileModelProvider{T}.Save"/> implementations, you should use <see cref="ReplaceModelMode.TransferDirty"/> instead.</param>
+		public void ReplaceModel<T>(IFileModelProvider<T> modelProvider, T model, ReplaceModelMode mode = ReplaceModelMode.SetAsDirty) where T : class
+		{
+			throw new NotImplementedException();
+		}
+		
+	}
+	
+	/*
+	/// <summary>
+	/// Represents an opened file.
+	/// </summary>
+	public abstract class OpenedFile : ICanBeDirty
+	{
+		protected IViewContent currentView;
+		bool inLoadOperation;
+		bool inSaveOperation;
+		
+		/// <summary>
+		/// holds unsaved file content in memory when view containing the file was closed but no other view
+		/// activated
+		/// </summary>
+		byte[] fileData;
 		
-		public abstract event EventHandler FileClosed;
 		
 		/// <summary>
 		/// Use this method to save the file to disk using a new name.
@@ -378,4 +500,5 @@ namespace ICSharpCode.SharpDevelop.Workbench
 			}
 		}
 	}
+	 */
 }

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

@@ -0,0 +1,89 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.Design;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using ICSharpCode.AvalonEdit.Document;
+using ICSharpCode.AvalonEdit.Utils;
+using ICSharpCode.Core;
+using ICSharpCode.SharpDevelop.Widgets.MyersDiff;
+
+namespace ICSharpCode.SharpDevelop.Workbench
+{
+	sealed class TextDocumentFileModelProvider : IFileModelProvider<TextDocument>
+	{
+		public TextDocument Load(OpenedFile file)
+		{
+			TextDocument document = file.GetModel(this, GetModelOptions.AllowStale | GetModelOptions.DoNotLoad);
+			var info = document != null ? document.GetFileModelInfo() : new DocumentFileModelInfo();
+			string textContent;
+			using (Stream stream = file.GetModel(FileModels.Binary).OpenRead()) {
+				using (StreamReader reader = FileReader.OpenStream(stream, SD.FileService.DefaultFileEncoding)) {
+					textContent = reader.ReadToEnd();
+					info.Encoding = reader.CurrentEncoding;
+				}
+			}
+			if (document != null) {
+				// Reload document
+				var diff = new MyersDiffAlgorithm(new StringSequence(document.Text), new StringSequence(textContent));
+				document.Replace(0, document.TextLength, textContent, ToOffsetChangeMap(diff.GetEdits()));
+				document.UndoStack.ClearAll();
+				info.IsStale = false;
+				return document;
+			} else {
+				document = new TextDocument(textContent);
+				document.GetRequiredService<IServiceContainer>().AddService(typeof(DocumentFileModelInfo), info);
+			}
+		}
+		
+		OffsetChangeMap ToOffsetChangeMap(IEnumerable<Edit> edits)
+		{
+			var map = new OffsetChangeMap();
+			int diff = 0;
+			foreach (var edit in edits) {
+				Debug.Assert(edit.EditType != ChangeType.None && edit.EditType != ChangeType.Unsaved);
+				int offset = edit.BeginA + diff;
+				int removalLength = edit.EndA - edit.BeginA;
+				int insertionLength = edit.EndB - edit.BeginB;
+				
+				diff += (insertionLength - removalLength);
+				map.Add(new OffsetChangeMapEntry(offset, removalLength, insertionLength));
+			}
+			return map;
+		}
+		
+		public void Save(OpenedFile file, TextDocument model)
+		{
+			throw new NotImplementedException();
+		}
+		
+		public void SaveCopyAs(OpenedFile file, TextDocument model, FileName outputFileName)
+		{
+			throw new NotImplementedException();
+		}
+		
+		bool IFileModelProvider<TextDocument>.CanLoadFrom<U>(IFileModelProvider<U> otherProvider)
+		{
+			return otherProvider == FileModels.Binary || FileModels.Binary.CanLoadFrom(otherProvider);
+		}
+		
+		public void NotifyRename(OpenedFile file, TextDocument model, FileName oldName, FileName newName)
+		{
+			model.FileName = newName;
+		}
+		
+		public void NotifyStale(OpenedFile file, TextDocument model)
+		{
+			model.GetFileModelInfo().IsStale = true;
+		}
+		
+		public void NotifyUnloaded(OpenedFile file, TextDocument model)
+		{
+			model.GetFileModelInfo().IsStale = true;
+		}
+	}
+}

src/Main/Core/Project/Src/Services/FileUtility/PathName.cs

@@ -57,6 +57,15 @@ namespace ICSharpCode.Core
 			return normalizedPath;
 		}
 		
+		/// <summary>
+		/// Converts the path into an URI. 
+		/// </summary>
+		/// <exception cref="UriFormatException">The path contains invalid characters for an URI.</exception>
+		public Uri ToUri()
+		{
+			return new Uri(normalizedPath, IsRelative ? UriKind.Relative : UriKind.Absolute);
+		}
+		
 		/// <summary>
 		/// Gets whether this path is relative.
 		/// </summary>