/// <summary>
/// Registers a set of scoped services for using Zero Install functionality.
/// </summary>
/// <typeparam name="TTaskHandler">A callback object used when the the user needs to be asked questions or informed about download and IO tasks.</typeparam>
/// <param name="services">The service collection to add the services to.</param>
public static IServiceCollection AddZeroInstall <TTaskHandler>(this IServiceCollection services)
where TTaskHandler : class, ITaskHandler
=> services.AddScoped <ITaskHandler, TTaskHandler>()
.AddScoped(x => Config.Load())
.AddScoped(x => ImplementationStores.Default())
.AddScoped(x => OpenPgp.Verifying())
.AddScoped(x => FeedCaches.Default(x.GetService <IOpenPgp>()))
.AddScoped(x => TrustDB.LoadSafe())
.AddScoped <ITrustManager, TrustManager>()
.AddScoped <IFeedManager, FeedManager>()
.AddScoped <ICatalogManager, CatalogManager>()
.AddScoped(x => PackageManagers.Default())
.AddScoped <ISelectionsManager, SelectionsManager>()
.AddScoped <ISolver, BacktrackingSolver>()
.AddScoped <IFetcher, SequentialFetcher>()
.AddScoped <IExecutor, Executor>()
.AddScoped <ISelectionCandidateProvider, SelectionCandidateProvider>();
/// <summary>
/// Registers a set of scoped services for using Zero Install functionality.
/// </summary>
/// <typeparam name="TTaskHandler">A callback object used when the the user needs to be asked questions or informed about download and IO tasks.</typeparam>
/// <param name="services">The service collection to add the services to.</param>
/// <param name="configuration">An optional configuration source for building <see cref="Config"/> instead of the default config files.</param>
public static IServiceCollection AddZeroInstall <TTaskHandler>(this IServiceCollection services, IConfiguration?configuration = null)
where TTaskHandler : class, ITaskHandler
=> services.AddScoped <ITaskHandler, TTaskHandler>()
.AddScoped(_ => (configuration == null) ? Config.Load() : Config.From(configuration))
.AddScoped(_ => ImplementationStores.Default())
.AddScoped(_ => OpenPgp.Verifying())
.AddScoped(provider => FeedCaches.Default(provider.GetRequiredService <IOpenPgp>()))
.AddScoped(_ => TrustDB.LoadSafe())
.AddScoped <ITrustManager, TrustManager>()
.AddScoped <IFeedManager, FeedManager>()
.AddScoped <ICatalogManager, CatalogManager>()
.AddScoped(_ => PackageManagers.Default())
.AddScoped <ISelectionsManager, SelectionsManager>()
.AddScoped <ISolver, BacktrackingSolver>()
.AddScoped <IFetcher, Fetcher>()
.AddScoped <IExecutor, Executor>()
.AddScoped <ISelectionCandidateProvider, SelectionCandidateProvider>();