FieldInfo GetField(string name)
{
Type type = GetType();
foreach (FieldInfo fieldInfo in type.GetFields())
{
if (string.Compare(fieldInfo.Name, name, true) == 0)
{
return(fieldInfo);
}
foreach (object attribute in fieldInfo.GetCustomAttributes(true))
{
if (attribute is CommandLineOptionAttribute)
{
CommandLineOptionAttribute optionAttribute = (CommandLineOptionAttribute)attribute;
if (string.Compare(optionAttribute.Name, name, true) == 0)
{
return(fieldInfo);
}
else if (string.Compare(optionAttribute.Alias, name, true) == 0)
{
return(fieldInfo);
}
}
}
}
return(null);
}
public void WriteUsage(string extraInformation)
{
Type type = GetType();
FieldInfo helpFieldInfo = GetField("?");
bool showExtendedHelp = helpFieldInfo != null ? (bool)helpFieldInfo.GetValue(this) : false;
var categories = new Dictionary <string, List <CommandLineOptionAttribute> >();
categories.Add("", new List <CommandLineOptionAttribute>());
int maxWidth = 0;
foreach (FieldInfo fieldInfo in type.GetFields())
{
foreach (object attribute in fieldInfo.GetCustomAttributes(true))
{
if (attribute is CommandLineOptionAttribute)
{
CommandLineOptionAttribute optionAttribute = (CommandLineOptionAttribute)attribute;
if (optionAttribute.Name == null)
{
optionAttribute.Name = fieldInfo.Name;
}
maxWidth = Math.Max(maxWidth, optionAttribute.FriendlyName.Length);
string category = "";
if (showExtendedHelp && optionAttribute.Category != null)
{
category = optionAttribute.Category;
}
List <CommandLineOptionAttribute> options;
if (!categories.TryGetValue(category, out options))
{
options = new List <CommandLineOptionAttribute>();
categories.Add(category, options);
}
options.Add(optionAttribute);
break;
}
}
}
foreach (KeyValuePair <string, List <CommandLineOptionAttribute> > category in categories)
{
if (category.Key != "")
{
Console.WriteLine();
Console.WriteLine(new string(' ', maxWidth) + "===" + category.Key + "===");
}
foreach (CommandLineOptionAttribute optionAttribute in category.Value)
{
if (!optionAttribute.Extended || showExtendedHelp)
{
string name = optionAttribute.FriendlyName;
string description = optionAttribute.Description;
string space = new string(' ', maxWidth - optionAttribute.FriendlyName.Length + 1);
string option = " " + name + space;
Console.WriteLine(option + WrapString(option.Length, description));
}
}
}
if (showExtendedHelp && extraInformation != null)
{
Console.WriteLine();
Console.WriteLine(extraInformation);
}
}