Support aggregate package source in NuGet.config settings.

src/AddIns/Misc/PackageManagement/Project/Src/RegisteredPackageSourceSettings.cs

@@ -14,6 +14,9 @@ namespace ICSharpCode.PackageManagement
 		public static readonly string PackageSourcesSectionName = "packageSources";
 		public static readonly string ActivePackageSourceSectionName = "activePackageSource";
 		
+		public static readonly PackageSource AggregatePackageSource = 
+			new PackageSource("(Aggregate source)", "All") { IsAggregate = true };
+		
 		ISettings settings;
 		RegisteredPackageSources packageSources;
 		PackageSource activePackageSource;
@@ -28,6 +31,18 @@ namespace ICSharpCode.PackageManagement
 		{
 			IList<KeyValuePair<string, string>> packageSources = settings.GetValues(ActivePackageSourceSectionName);
 			activePackageSource = PackageSourceConverter.ConvertFromFirstKeyValuePair(packageSources);
+			
+			if (IsActivePackageSourceAggregatePackageSource()) {
+				activePackageSource.IsAggregate = true;
+			}
+		}
+		
+		bool IsActivePackageSourceAggregatePackageSource()
+		{
+			if (activePackageSource != null) {
+				return activePackageSource.Source == AggregatePackageSource.Source;
+			}
+			return false;
 		}
 		
 		public RegisteredPackageSources PackageSources {
@@ -81,9 +96,14 @@ namespace ICSharpCode.PackageManagement
 		
 		public PackageSource ActivePackageSource {
 			get {
+				if (activePackageSource != null) {
+					if (activePackageSource.IsAggregate) {
+						return activePackageSource;
+					}
 					if (PackageSources.Contains(activePackageSource)) {
 						return activePackageSource;
 					}
+				}
 				return null;
 			}
 			set {

src/AddIns/Misc/PackageManagement/Test/Src/PackageManagementOptionsTests.cs

@@ -271,5 +271,18 @@ namespace PackageManagement.Tests
 			
 			Assert.DoesNotThrow(() => SaveOptions());
 		}
+		
+		[Test]
+		public void ActivePackageSource_AggregatePackageSourceIsActivePackageSourceInSettings_ReturnsAggregatePackageSource()
+		{
+			CreateSettings();
+			var expectedPackageSource = RegisteredPackageSourceSettings.AggregatePackageSource;
+			fakeSettings.SetFakeActivePackageSource(expectedPackageSource);
+			CreateOptions(fakeSettings);
+			
+			var activePackageSource = options.ActivePackageSource;
+			
+			Assert.AreEqual(expectedPackageSource, activePackageSource);
+		}
 	}
 }