(chocolatey#2503) Export via serialization of class

Instead of exporting via building an xml document manually, this
creates a PackagesConfigFilePackageSetting and serializes that to
create the xml document that is saved. This allows for usage of the
same class as is used to read in packages.config files to export
those files.

The reason the various "Specified" members are added to the
PackagesConfigFilePackageSetting class is so if an element is not set
during export, it will not show up at all in the resulting serialized
packages.config file.

# Conflicts:
#	src/chocolatey/infrastructure.app/commands/ChocolateyExportCommand.cs

Author: gep13

src/chocolatey/infrastructure.app/commands/ChocolateyExportCommand.cs

@@ -182,12 +182,12 @@ public void Run(ChocolateyConfiguration configuration)
 
                                 xw.WriteAttributeString("sourceType", "nuget");
 
-                                xw.WriteEndElement();
+                                packagesConfig.Packages.Add(packageElement);
                             }
 
                             if (configuration.ExportCommand.IncludeRegistryPrograms)
                             {
-                                var itemsToRemoveFromMachine = packageResults.Select(package => _packageInfoService.Get(package.PackageMetadata)).Where(p => p.RegistrySnapshot != null).ToList();
+                                var itemsToRemoveFromMachine = installedPackages.Select(package => _packageInfoService.Get(package.PackageMetadata)).Where(p => p.RegistrySnapshot != null).ToList();
 
                                 var machineInstalled = _registryService.GetInstallerKeys().RegistryKeys.Where(
                                     p => p.IsInProgramsAndFeatures() &&
@@ -231,8 +231,10 @@ public void Run(ChocolateyConfiguration configuration)
                                 }
                             }
 
-                            xw.WriteEndElement();
-                            xw.Flush();
+                            var ns = new XmlSerializerNamespaces();
+                            ns.Add("", "");
+                            var packagesConfigSerializer = new XmlSerializer(typeof(PackagesConfigFileSettings));
+                            packagesConfigSerializer.Serialize(xw, packagesConfig, ns);
                         }
 
                         var fullOutputFilePath = _fileSystem.GetFullPath(configuration.ExportCommand.OutputFilePath);

src/chocolatey/infrastructure.app/services/INugetService.cs

@@ -61,16 +61,12 @@ public interface INugetService : ISourceRunner
         /// <param name="packageName">Name of the package.</param>
         void EnsureBackupDirectoryRemoved(string packageName);
 
-<<<<<<< HEAD
-=======
-
         /// <summary>
         ///   Get all installed packages
         /// </summary>
         /// <param name="config">The configuration</param>
         IEnumerable<PackageResult> GetInstalledPackages(ChocolateyConfiguration config);
 
-
         /// <summary>
         /// Gets the configuration from remembered arguments
         /// </summary>
@@ -80,7 +76,6 @@ public interface INugetService : ISourceRunner
         ChocolateyConfiguration GetPackageConfigFromRememberedArguments(ChocolateyConfiguration config,
             ChocolateyPackageInformation packageInfo);
 
->>>>>>> 85ab9168 ((#2886) Switch remembered args to only change local configuration)
 #pragma warning disable IDE0022, IDE1006
         [Obsolete("This overload is deprecated and will be removed in v3.")]
         ConcurrentDictionary<string, PackageResult> get_outdated(ChocolateyConfiguration config);