private static IEnumerable <IEnumerable <OptionSource> > GetConfig <TOptions>(string[] args, string environmentPrefix, string defaultConfigLocation = null) where TOptions : class, IOptions, new()
{
var commandline = CommandLine.Parse <TOptions>(args).Normalize();
var commanddict = commandline.ToDictionary(x => x.Name.ToLower());
yield return(commandline);
yield return(EnvironmentVariables.Parse <TOptions>(x => NameTranslators.PrefixEnvironmentVariable(x, environmentPrefix).ToUpper()));
var configFile = commanddict.ContainsKey("config") ?
commanddict["config"].Value as string : null;
if (configFile == null && File.Exists(defaultConfigLocation))
{
configFile = defaultConfigLocation;
yield return(new OptionSource[] { OptionSource.String("Config File", "config", defaultConfigLocation) });
}
if (configFile != null)
{
if (!File.Exists(configFile))
{
throw new OptionException(String.Format("The specified config file {0} could not be found", configFile), "config");
}
yield return(Yaml.FromFile(configFile));
}
yield return(TypeDefaultOptions.Get <TOptions>());
}
