/// <summary>
/// Creates an instance of <see cref="CliApplication"/> or <see cref="InteractiveCliApplication"/> using configured parameters.
/// Default values are used in place of parameters that were not specified.
/// </summary>
public CliApplication Build()
{
if (_cliApplicationBuilt)
{
throw new InvalidOperationException("Build can only be called once.");
}
_cliApplicationBuilt = true;
// Set default values
_title ??= AssemblyExtensions.TryGetDefaultTitle() ?? "App";
_executableName ??= AssemblyExtensions.TryGetDefaultExecutableName() ?? "app";
_versionText ??= AssemblyExtensions.TryGetDefaultVersionText() ?? "v1.0";
_console ??= new SystemConsole();
_exceptionHandler ??= new DefaultExceptionHandler();
_userDefinedShortcuts ??= new HashSet <ShortcutDefinition>();
// Format startup message
if (_startupMessage != null)
{
_startupMessage = Regex.Replace(_startupMessage, @"{(?<x>[^}]+)}", match =>
{
string value = match.Groups["x"].Value;
return(value.ToLower() switch
{
"title" => _title,
"executable" => _executableName,
"version" => _versionText,
"description" => _description ?? string.Empty,
_ => string.Concat("{", value, "}")
});
});
