/// <summary>
///
/// </summary>
/// <param name="flags">
/// </param>
public void DisplayHelp()
{
FieldInfo[] fields = GetFields();
List <HelpData> help = new List <HelpData>();
int longestShortCode = 0;
int longestLongCode = 0;
int longestHelpText = 0;
int lineLength = 0;
string lineSeparator = string.Empty;
foreach (FieldInfo field in fields)
{
Attribute[] attrs = field.GetCustomAttributes(false)
as Attribute[];
HelpData data = new HelpData();
int helpLen = 0;
data.shortCode = string.Empty;
data.longCode = string.Empty;
data.helpText = new string[1];
foreach (Attribute attr in attrs)
{
if (attr is OptionAttribute)
{
OptionAttribute option = attr as OptionAttribute;
data.shortCode = option.ShortCode;
data.longCode = option.LongCode;
}
else if (attr is VerbAttribute)
{
VerbAttribute verb = attr as VerbAttribute;
if (verb.Code.StartsWith("--"))
{
data.longCode = verb.Code;
}
else
{
data.shortCode = verb.Code;
}
}
else if (attr is HelpTextAttribute)
{
HelpTextAttribute helpText = attr as HelpTextAttribute;
string helpTextValue = helpText.HelpText;
string[] split = helpTextValue.Split(' ');
int lines = 1;
int len = 0;
for (int wordIndex = 0;
split.Length > wordIndex;
++wordIndex)
{
// do not add space for last word.
int addSpace =
(wordIndex + 1 < split.Length ? 1 : 0);
// if greater than 50, move to next line.
if (len + split[wordIndex].Length + addSpace > 50)
{
lines++;
len = 0;
}
len += split[wordIndex].Length + addSpace;
}
data.helpText = new string[lines];
int wordInd = 0;
for (int index = 0; lines > index; ++index)
{
string text = string.Empty;
for ( ; split.Length > wordInd; ++wordInd)
{
int addSpace =
(wordInd + 1 < split.Length ? 1 : 0);
string word = split[wordInd];
int lineLen;
lineLen = text.Length + word.Length +
addSpace;
if (lineLen > 50)
{
// Move to next line
break;
}
text += word + Spaces(addSpace);
}
data.helpText[index] = text;
if (helpLen < data.helpText[index].Length)
{
helpLen = data.helpText[index].Length;
}
}
}
}
if (longestShortCode < data.shortCode.Length)
{
longestShortCode = data.shortCode.Length;
}
if (longestLongCode < data.longCode.Length)
{
longestLongCode = data.longCode.Length;
}
if (longestHelpText < helpLen)
{
longestHelpText = helpLen;
}
int currentLineLength = longestShortCode + longestLongCode +
longestHelpText + 9;
if (lineLength < currentLineLength)
{
lineLength = currentLineLength;
}
help.Add(data);
}
lineSeparator = new string( '-', lineLength );
Console.WriteLine("Usage: {0} [options]",
Environment.GetCommandLineArgs()[0]);
Console.WriteLine();
Console.WriteLine("Options:");
Console.WriteLine(lineSeparator);
foreach (HelpData data in help)
{
// Format output: help text can have more than one line,
// so this renders each line. The flags will always be
// output on the first line for the help text.
for (int index = 0; data.helpText.Length > index; ++index)
{
string text = string.Format("| {0} | {1} |",
Spaces(longestShortCode), Spaces(longestLongCode));
// Add flags to line if first line.
if (0 == index)
{
int numSpacesShort =
longestShortCode - data.shortCode.Length;
int numSpacesLong =
longestLongCode - data.longCode.Length;
text = string.Format("| {0}{1} | {2}{3} |",
Spaces(numSpacesShort), data.shortCode,
data.longCode, Spaces(numSpacesLong));
}
string line = data.helpText[index];
int padding = lineLength - text.Length - 2 - line.Length;
text = string.Format("{0} {1}{2}|", text, line,
Spaces(padding));
Console.WriteLine(text);
}
Console.WriteLine(lineSeparator);
}
}
/// <summary>
///
/// </summary>
/// <param name="arguments">
/// </param>
/// <param name="flags">
/// </param>
/// <param name="extras">
/// </param>
public bool Parse(string[] arguments, ref OptionType flags,
ref List <string> extras)
{
FieldInfo[] fields = GetFields();
for (int index = 0; arguments.Length > index; ++index)
{
CultureInfo invariant = CultureInfo.InvariantCulture;
bool captured = false;
string arg =
arguments[index].ToUpper(invariant);
foreach (FieldInfo field in fields)
{
object[] attrs;
attrs = field.GetCustomAttributes(false);
foreach (object attr in attrs)
{
if (attr is VerbAttribute)
{
VerbAttribute verb = attr as VerbAttribute;
// All types associated with a VerbAttribute should
// be a `bool` type.
if (typeof(bool) != field.FieldType)
{
string error = "A boolean type was expected for a verb!";
throw new VerbTypeException(error);
}
string code = verb.Code.ToUpper(invariant);
if (arg.Equals(code))
{
field.SetValue(flags, true);
// The argument was captured by the requested
// flags.
captured = true;
}
}
else if (attr is OptionAttribute)
{
// arguments passed via command line should use
// ":" to separate the flag and the value the
// flag will be set to.
string[] args = arg.Split(':');
if (2 != args.Length)
{
// There should be exactly two elements in the
// array if it is not a verb attribute or extra.
// It could be a verb that has not been iterated
// through quite yet.
continue;
}
OptionAttribute option = attr as OptionAttribute;
string longCode = option.LongCode;
string shortCode = option.ShortCode;
string cmd = args[0];
// Pass to SetField what was passend on the command
// line, not what is being used to test.
string[] split = arguments[index].Split(':');
string cmd2 = split[0];
string value = split[1];
longCode = longCode.ToUpper(invariant);
shortCode = shortCode.ToUpper(invariant);
cmd = cmd.ToUpper(invariant);
if (cmd == shortCode || cmd == longCode)
{
if (!SetField(ref flags, field, cmd2, value))
{
return(false);
}
captured = true;
}
}
}
}
if (!captured)
{
extras.Add(arguments[index]);
}
}
return(true);
}
