Update project alteration task to support references from "lib"

In the Orchard.Web.csproj file for WebPI, we need to reference all
assemblies coming from our "lib" folder to point to the "bin" folder
of the deployed app.

--HG--
branch : dev

src/Tools/MSBuild.Orchard.Tasks/StageProjectAlteration.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Xml.Linq;
@@ -17,11 +18,14 @@ namespace MSBuild.Orchard.Tasks {
 
 
         public override bool Execute() {
+            //System.Diagnostics.Debugger.Break();
+
             Log.LogMessage("Altering \"{0}\"", ProjectFileName);
 
             var context = new Context(this);
             if (context.LoadProject() &&
                 context.ChangeProjectReferencesToFileReferences() &&
+                context.ChangeLibraryReferencesToFileReferences() &&
                 context.FindExtraFiles() &&
                 context.AddContentFiles() &&
                 context.SaveProject()) {
@@ -88,12 +92,17 @@ namespace MSBuild.Orchard.Tasks {
                 }
 
                 foreach (var projectReferenceName in projectReferences.Elements(Name)) {
+                    string oldHintPath = (projectReferenceName.Parent.Element(HintPath) ?? new XElement(HintPath)).Value;
+                    string newHintPath = string.Format("bin\\{0}.dll", (string)projectReferenceName);
                     var reference = new XElement(
                         Reference,
                         new XAttribute(Include, (string)projectReferenceName),
                         new XElement(SpecificVersion, "False"),
-                        new XElement(HintPath, string.Format("bin\\{0}.dll", (string)projectReferenceName)));
+                        new XElement(HintPath, newHintPath));
                     referenceItemGroup.Add(reference);
+
+                    _task.Log.LogMessage("Project reference \"{0}\": HintPath changed from \"{1}\" to \"{2}\"",
+                        (string)projectReferenceName, oldHintPath, newHintPath);
                 }
 
                 foreach (var projectReference in projectReferences.ToArray()) {
@@ -103,6 +112,54 @@ namespace MSBuild.Orchard.Tasks {
                 return true;
             }
 
+            public bool ChangeLibraryReferencesToFileReferences() {
+                var libraryReferences = _document
+                    .Elements(Project)
+                    .Elements(ItemGroup)
+                    .Elements(Reference);
+
+                var referenceItemGroup = _document
+                    .Elements(Project)
+                    .Elements(ItemGroup)
+                    .FirstOrDefault(elt => elt.Elements(Reference).Any());
+
+                if (referenceItemGroup == null) {
+                    referenceItemGroup = new XElement(ItemGroup);
+                    _document.Root.Add(referenceItemGroup);
+                }
+
+                List<XElement> elementsToRemove = new List<XElement>();
+                foreach (var hintPathElement in libraryReferences.Elements(HintPath)) {
+                    string oldHintPath = hintPathElement.Value;
+
+                    if (!oldHintPath.StartsWith("..\\..\\lib\\"))
+                        continue;
+
+                    elementsToRemove.Add(hintPathElement.Parent);
+                    // Need to change the hint path from
+                    // ..\\..\\lib\\<libraryfolder>\\<AssemblyName>.dll
+                    // to
+                    // bin\\<AssemblyName>.dll
+                    string assemblyFileName = Path.GetFileName(oldHintPath);
+                    string newHintPath = Path.Combine("bin", assemblyFileName);
+                    var reference = new XElement(
+                        Reference,
+                        new XAttribute(Include, hintPathElement.Parent.Attribute(Include).Value),
+                        new XElement(SpecificVersion, "False"),
+                        new XElement(HintPath, newHintPath));
+                    referenceItemGroup.Add(reference);
+
+                    _task.Log.LogMessage("Assembly (library) Reference \"{0}\": HintPath changed from \"{1}\" to \"{2}\"",
+                        hintPathElement.Parent.Attribute(Include).Value, oldHintPath, newHintPath);
+                }
+
+                foreach (var reference in elementsToRemove) {
+                    reference.Remove();
+                }
+
+                return true;
+            }
+
             public bool FindExtraFiles() {
                 var extraFiles = _document
                     .Elements(Project)