private static Dictionary <string, PropertyInfo> CreateAliasMap(Type type)
{
Dictionary <string, PropertyInfo> options = new Dictionary <string, PropertyInfo>();
PropertyInfo[] properties = type.GetProperties();
foreach (PropertyInfo property in properties)
{
AddProperty(options, property.Name, property);
AliasAttribute aliasAttribute = property.GetCustomAttribute <AliasAttribute>();
if (aliasAttribute != null)
{
foreach (string alias in aliasAttribute.Aliases)
{
AddProperty(options, alias, property);
}
}
}
return(options);
}
/// <summary>
/// Generate a help page for the given type.
/// </summary>
/// <param name="type">Type of which to create a help page.</param>
/// <param name="programName">The name of the program in the console.</param>
/// <returns>A help page as a string.</returns>
public static string GetHelpPage(Type type, string programName)
{
if (type == null)
{
throw new ArgumentNullException(nameof(type));
}
PropertyInfo[] properties = type.GetProperties();
List <string> options = new List <string>();
List <string> arguments = new List <string>();
List <string> descriptions = new List <string>();
List <string> unnamedArgs = new List <string>();
for (int i = 0; i < properties.Length; i++)
{
PropertyInfo property = properties[i];
UnnamedAttribute unnamed = property.GetCustomAttribute <UnnamedAttribute>();
if (unnamed != null)
{
unnamedArgs.Add(GetArgumentName(property));
}
else
{
StringBuilder aliases = new StringBuilder();
aliases.Append($"-{property.Name}");
AliasAttribute aliasAttribute = property.GetCustomAttribute <AliasAttribute>();
if (aliasAttribute != null)
{
foreach (string alias in aliasAttribute.Aliases)
{
aliases.Append($" -{alias}");
}
}
DescriptionAttribute descAttr = property.GetCustomAttribute <DescriptionAttribute>();
options.Add(aliases.ToString());
arguments.Add(GetArgumentName(property));
descriptions.Add(descAttr == null ? string.Empty : descAttr.Text);
}
}
int optionsLength = options.Max(x => x.Length);
int argumentsLength = arguments.Max(x => x.Length);
StringBuilder help = new StringBuilder();
DescriptionAttribute classDescAttr = type.GetCustomAttribute <DescriptionAttribute>();
if (classDescAttr != null && classDescAttr.Text != null)
{
help.AppendLine(classDescAttr.Text);
}
help.AppendLine($"Usage: {programName} [options] {string.Join(" ", unnamedArgs.Select(x => $"[{x}]"))}".Trim());
help.AppendLine("Options:");
for (int i = 0; i < options.Count; i++)
{
help.Append(" ").AppendLine($"{GetTextWithFiller(options[i], optionsLength + 4)}{GetTextWithFiller(arguments[i], argumentsLength + 4)}{descriptions[i]}".Trim());
}
return(help.ToString());
}
