public string ToString(int lineWidth = 80)
{
var appName = Assembly.GetExecutingAssembly().GetName().Name;
var sb = new ConsoleStringBuilder(lineWidth);
sb.Append($"Usage: {appName} ");
if (actions.Count > 0 || actions.Count > 0)
{
sb.Append("[OPTION]... ");
}
if (positionalArguments.Count > 0)
{
sb.Append(PositionalToString());
}
sb.AppendLine();
sb.AppendLine();
if (explicitArguments.Count > 0)
{
sb.AppendLine("Mandatory arguments to long options are mandatory for short options too."); // NOTE: might be optional?
AppendArguments(sb);
sb.AppendLine();
sb.AppendLine();
}
var manualAttribute = typeof(T).GetCustomAttribute <CommandManualAttribute>();
if (manualAttribute != null)
{
sb.AppendLine(manualAttribute.Description);
sb.AppendLine();
}
return(sb.ToString());
}
private void AppendArguments(ConsoleStringBuilder sb)
{
const int optionBaseIndentation = 2;
const int textIndentation = 32;
const int aliasLength = 2; //-A
const string aliasSeparator = ", ";
// TODO: add [required] keyword
foreach (var argument in explicitArguments)
{
var line = new string(' ', optionBaseIndentation);
if (argument.GetAlias() != 0)
{
line += $"-{argument.GetAlias()}";
}
if (!string.IsNullOrEmpty(argument.GetAction()))
{
line += argument.GetAlias() == 0 ? new string(' ', aliasLength + aliasSeparator.Length) : aliasSeparator;
line += argument.GetAction() + " ";
}
line += new string(' ', textIndentation - line.Length); // TODO might be too long.
if (argument.IsRequired())
{
line += "[required] ";
}
if (!string.IsNullOrEmpty(argument.GetHelp()))
{
line += argument.GetHelp();
}
sb.AppendLine(line, textIndentation);
}
}
