[Ide] Allow loading some unsupported projects

Some project types that are known to be unsupported in some platforms can
now be partially loaded. The solution pad shows the files of the project,
although nothing can really be done with the project.

1 files changed, 32 insertions, 24 deletions

diff --git a/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Formats.MSBuild/MSBuildProjectHandler.cs b/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Formats.MSBuild/MSBuildProjectHandler.cs
index 20dc17c31e..3fa6ff8a59 100644
--- a/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Formats.MSBuild/MSBuildProjectHandler.cs
+++ b/main/src/core/MonoDevelop.Core/MonoDevelop.Projects.Formats.MSBuild/MSBuildProjectHandler.cs
@@ -72,6 +72,8 @@ namespace MonoDevelop.Projects.Formats.MSBuild
 		string productVersion;
 		string schemaVersion;
 
+		public bool ProjectTypeIsUnsupported { get; set; }
+
 		public List<string> TargetImports {
 			get { return targetImports; }
 		}
@@ -400,8 +402,9 @@ namespace MonoDevelop.Projects.Formats.MSBuild
 		SolutionItem CreateSolutionItem (IProgressMonitor monitor, MSBuildProject p, string fileName, string language,
 			string itemType, Type itemClass)
 		{
-			SolutionItem item = null;
-			
+			if (ProjectTypeIsUnsupported)
+				return new UnknownProject (fileName);
+
 			if (subtypeGuids.Any ()) {
 				DotNetProjectSubtypeNode st = MSBuildProjectService.GetDotNetProjectSubtype (subtypeGuids);
 				if (st != null) {
@@ -429,35 +432,37 @@ namespace MonoDevelop.Projects.Formats.MSBuild
 						p.Save (fileName);
 					}
 
-					item = st.CreateInstance (language);
+					var item = st.CreateInstance (language);
 					st.UpdateImports ((SolutionEntityItem)item, targetImports);
-				} else
-					throw new UnknownSolutionItemTypeException (string.Join (";", subtypeGuids));
+					return item;
+				} else {
+					var projectInfo = MSBuildProjectService.GetUnknownProjectTypeInfo (subtypeGuids.ToArray ());
+					if (projectInfo != null && projectInfo.LoadFiles) {
+						ProjectTypeIsUnsupported = true;
+						return new UnknownProject (fileName);
+					}
+					throw new UnknownSolutionItemTypeException (ProjectTypeIsUnsupported ? TypeGuid : string.Join (";", subtypeGuids));
+				}
 			}
 
-			if (item == null && itemClass != null)
-				item = (SolutionItem) Activator.CreateInstance (itemClass);
+			if (itemClass != null)
+				return (SolutionItem) Activator.CreateInstance (itemClass);
 			
-			if (item == null && !string.IsNullOrEmpty (language)) {
-				item = new DotNetAssemblyProject (language);
-
+			if (!string.IsNullOrEmpty (language)) {
 				//enable msbuild by default .NET assembly projects
 				UseMSBuildEngineByDefault = true;
 				RequireMSBuildEngine = false;
+				return new DotNetAssemblyProject (language);
 			}
 			
-			if (item == null) {
-				if (string.IsNullOrEmpty (itemType))
-					throw new UnknownSolutionItemTypeException ();
-					
-				DataType dt = MSBuildProjectService.DataContext.GetConfigurationDataType (itemType);
-				if (dt == null)
-					throw new UnknownSolutionItemTypeException (itemType);
-					
-				item = (SolutionItem) Activator.CreateInstance (dt.ValueType);
-			}
-
-			return item;
+			if (string.IsNullOrEmpty (itemType))
+				throw new UnknownSolutionItemTypeException ();
+				
+			DataType dt = MSBuildProjectService.DataContext.GetConfigurationDataType (itemType);
+			if (dt == null)
+				throw new UnknownSolutionItemTypeException (itemType);
+				
+			return (SolutionItem) Activator.CreateInstance (dt.ValueType);
 		}
 
 		Type MigrateProject (IProgressMonitor monitor, DotNetProjectSubtypeNode st, MSBuildProject p, string fileName, string language)
@@ -606,7 +611,7 @@ namespace MonoDevelop.Projects.Formats.MSBuild
 				if (it is ProjectFile) {
 					var file = (ProjectFile)it;
 
-					if (file.Name.IndexOf ('*') > -1)  {
+					if (file.Name.IndexOf ('*') > -1) {
 						// Thanks to IsOriginatedFromWildcard, these expanded items will not be saved back to disk.
 						foreach (var expandedItem in ResolveWildcardItems (file))
 							EntityItem.Items.Add (expandedItem);
@@ -616,7 +621,10 @@ namespace MonoDevelop.Projects.Formats.MSBuild
 						EntityItem.WildcardItems.Add (it);
 						continue;
 					}
-				}
+					if (ProjectTypeIsUnsupported && !File.Exists (file.FilePath))
+						continue;
+				} else if (ProjectTypeIsUnsupported)
+					continue;
 
 				EntityItem.Items.Add (it);
 			}