added VersioningServices

src/AddIns/VersionControl/SubversionAddIn/ICSharpCode.Svn.addin

@@ -23,6 +23,16 @@
 		       class = "ICSharpCode.Svn.Commands.RegisterEventsCommand"/>
 	</Path>
 	
+	<Path name="/Workspace/DiffProviders">
+		<Class id="svn"
+		       class="ICSharpCode.Svn.SvnDiffProvider" />
+	</Path>
+	
+	<Path name="/Workspace/BaseVersionProviders">
+		<Class id="svn"
+		       class="ICSharpCode.Svn.SvnBaseVersionProvider" />
+	</Path>
+	
 	<Path name = "/SharpDevelop/Workbench/DisplayBindings">
 		<DisplayBinding id               = "SubversionHistoryView"
 		                type             = "Secondary"

src/AddIns/VersionControl/SubversionAddIn/Src/SvnDiffProvider.cs

@@ -0,0 +1,39 @@
+// 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.SharpDevelop;
+using ICSharpCode.SharpDevelop.Editor;
+using SharpSvn.Diff;
+
+namespace ICSharpCode.Svn
+{
+	/// <summary>
+	/// Description of SvnDiffProvider.
+	/// </summary>
+	public class SvnDiffProvider : IDiffProvider
+	{
+		public Stream GetDiff(string fileName, ITextBuffer modifiedBuffer)
+		{
+			SvnFileDiff diff;
+			string tempFile = Path.GetTempFileName();
+			MemoryStream stream = new MemoryStream();
+
+			File.WriteAllText(tempFile, modifiedBuffer.Text);
+			SvnFileDiff.TryCreate(fileName, tempFile, new SvnFileDiffArgs(), out diff);
+			diff.WriteDifferences(stream, new SvnDiffWriteDifferencesArgs());
+			File.Delete(tempFile);
+
+			return stream;
+		}
+	}
+	
+	public class SvnBaseVersionProvider : IDocumentBaseVersionProvider
+	{
+		public Stream OpenBaseVersion(string fileName)
+		{
+			throw new NotImplementedException();
+		}
+	}
+}

src/AddIns/VersionControl/SubversionAddIn/SubversionAddIn.csproj

@@ -83,6 +83,7 @@
     <Compile Include="Src\Commands\CheckoutCommands.cs" />
     <Compile Include="Src\SubversionStateCondition.cs" />
     <Compile Include="Src\SvnClientWrapper.cs" />
+    <Compile Include="Src\SvnDiffProvider.cs" />
     <Compile Include="Src\SvnMessageView.cs" />
     <EmbeddedResource Include="Src\Gui\HistoryViewDisplayBinding\InfoPanel.resx">
       <DependentUpon>InfoPanel.cs</DependentUpon>

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

@@ -107,6 +107,7 @@
     <Compile Include="Src\Editor\Commands\FindReferences.cs" />
     <Compile Include="Src\Editor\Commands\GotoLineNumber.cs" />
     <Compile Include="Src\Editor\Commands\SymbolUnderCaretMenuCommand.cs" />
+    <Compile Include="Src\Editor\IDocumentBaseVersionProvider.cs" />
     <Compile Include="Src\Editor\IEditorControlService.cs" />
     <Compile Include="Src\Editor\IEditorUIService.cs" />
     <Compile Include="Src\Editor\CodeCompletion\AttributesItemProvider.cs" />

src/Main/Base/Project/Src/Editor/IDocumentBaseVersionProvider.cs

@@ -0,0 +1,51 @@
+// 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.IO;
+using ICSharpCode.Core;
+
+namespace ICSharpCode.SharpDevelop.Editor
+{
+	public interface IDocumentBaseVersionProvider
+	{
+		/// <summary>
+		/// Provides the BASE-Version for a file. This can be either the file saved
+		/// to disk or a base version provided by any VCS.
+		/// </summary>
+		Stream OpenBaseVersion(string fileName);
+	}
+	
+	public interface IDiffProvider
+	{
+		Stream GetDiff(string fileName, ITextBuffer modifiedBuffer);
+	}
+	
+	public class VersioningServices
+	{
+		public static readonly VersioningServices Instance = new VersioningServices();
+		
+		List<IDocumentBaseVersionProvider> baseVersionProviders;
+		
+		public List<IDocumentBaseVersionProvider> BaseVersionProviders {
+			get {
+				if (baseVersionProviders == null)
+					baseVersionProviders = AddInTree.BuildItems<IDocumentBaseVersionProvider>("/Workspace/BaseVersionProviders", this, false);
+				
+				return baseVersionProviders;
+			}
+		}
+		
+		List<IDiffProvider> diffProviders;
+		
+		public List<IDiffProvider> DiffProviders {
+			get {
+				if (diffProviders == null)
+					diffProviders = AddInTree.BuildItems<IDiffProvider>("/Workspace/DiffProviders", this, false);
+				
+				return diffProviders;
+			}
+		}
+	}
+}