public void WriteUsageOptions(TextWriter output)
{
var anyShortOptions = AllOptions.OfType <Option>().Any(o => o.ShortNameForUsage.Length > 0);
var maxOptionNameLength = AllOptions.OfType <Option>().Max(o => o.NameForUsage.Length);
var formatter = new FixedWidthFormatProvider();
Action <Option> writeOption = o => {
output.Write(" ");
if (anyShortOptions)
{
output.Write(string.Format(formatter, "{0:2}", o.ShortNameForUsage));
if (o.NameForUsage.Length > 0)
{
output.Write(o.ShortNameForUsage.Length > 0 ? "," : " ");
}
}
output.WriteLine(string.Format(formatter, " {0:" + maxOptionNameLength + "} {1}", o.NameForUsage, o.DescriptionForUsage));
};
var describedArguments = AllOptions
.OfType <Argument>()
.Where(a => a.DescriptionForUsage.Length > 0)
.Select(a => a.DescriptionForUsage);
if (describedArguments.Any())
{
output.WriteLine();
describedArguments.Each(output.WriteLine);
}
if (Options.OfType <Option>().Any())
{
output.WriteLine();
Options.OfType <Option>().Each(writeOption);
}
groups
.Each(g => {
output.WriteLine();
output.WriteLine("{0}:", g.Key);
g.Value.Options.OfType <Option>().Each(writeOption);
});
}
public void WriteUsageHeader(TextWriter output)
{
var applicationName = Path.GetFileNameWithoutExtension(AppDomain.CurrentDomain.FriendlyName);
output.Write("Usage: {0} [OPTION]...", applicationName);
output.Write(
AllOptions
.OfType <Argument>()
.OrderByDescending(a => a.Required)
.Select(a => a.Required ? a.Name : string.Format("[{0}]", a.Name) + (a.SupportsMultipleValues ? " ..." : ""))
.Aggregate("", (acc, a) => acc + " " + a)
);
output.WriteLine();
if (string.IsNullOrEmpty(Header))
{
return;
}
output.WriteLine();
output.WriteLine(Header);
}