public static ParserResult <object> ParseVerbs(this Parser parser, IEnumerable <string> args, IDynamicVerbFactory dynamicVerbFactory, params Type[] types)
{
string[] argsArray = ModifyArgs();
return(ParseVerbs(parser, argsArray, dynamicVerbFactory, types.Concat(dynamicVerbFactory.GetDynamicVerbs(Array.Empty <string>())).ToArray(), new List <string>()));
string[] ModifyArgs()
{
string[] result = args.ToArray();
if (result.Length > 1)
{
for (int i = 0; i < result.Length; i++)
{
if (result[i] == "--version")
{
result[i] = "-v";
}
}
}
return(result);
}
}
private static ParserResult <object> ParseVerbs(Parser parser, string[] argsArray, IDynamicVerbFactory dynamicVerbFactory, Type[] types, List <string> path)
{
if (parser == null)
{
throw new ArgumentNullException(nameof(parser));
}
if (argsArray.Length == 0 || argsArray[0].StartsWith("-", StringComparison.Ordinal))
{
return(parser.ParseArguments(argsArray, types));
}
var verb = argsArray[0];
foreach (var type in types)
{
var verbAttribute = type.GetCustomAttribute <VerbAttribute>();
if (verbAttribute == null || verbAttribute.Name != verb)
{
continue;
}
path.Add(verb);
var subVerbsAttribute = type.GetCustomAttribute <ChildVerbsAttribute>();
Type[] subTypes = subVerbsAttribute?.Types ?? Array.Empty <Type>();
subTypes = subTypes.Concat(dynamicVerbFactory.GetDynamicVerbs(path)).ToArray();
if (subTypes.Any() && type.GetCustomAttribute <UseChildVerbsAsCategoryAttribute>() == null)
{
return(ParseVerbs(parser, argsArray.Skip(1).ToArray(), dynamicVerbFactory, subTypes, path));
}
break;
}
return(parser.ParseArguments(argsArray, types));
}
private string ConstructHelp(ParserResult <object> result, ParserTypeInfo typeInfo)
{
List <string> helpText = new List <string>();
IEnumerable <Error> errors = ((NotParsed <object>)result).Errors.ToArray();
CopyrightInfo CreateCopyrightInfo()
{
try
{
return(CopyrightInfo.Default);
}
catch (Exception e)
{
executionContext.WriteError($"Exception while creating the copyright:{Environment.NewLine}{e}", false);
}
return(CopyrightInfo.Empty);
}
bool helpVerbRequested = errors.Any(e => e.Tag == ErrorType.HelpVerbRequestedError);
Assembly assembly = Assembly.GetEntryAssembly() ?? Assembly.GetExecutingAssembly();
GenerateHelpTextHeader();
GenerateHelpTextBody();
GenerateHelpTextFooter();
string help = string.Join(Environment.NewLine, helpText);
return(help);
void GenerateHelpTextHeader()
{
HelpText helpTextHeader = new HelpText
{
Heading = CreateHeadingInfo(),
Copyright = CreateCopyrightInfo(),
AdditionalNewLineAfterOption = true,
AddDashesToOption = true,
MaximumDisplayWidth = DisplayWidth
};
helpTextHeader = HelpText.DefaultParsingErrorsHandler(result, helpTextHeader);
AssemblyLicenseAttribute licenseAttribute = assembly.GetCustomAttribute <AssemblyLicenseAttribute>();
licenseAttribute?.AddToHelpText(helpTextHeader);
helpText.AddRange(helpTextHeader.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None));
}
void GenerateHelpTextBody()
{
if ((helpVerbRequested && typeInfo.Choices.Any()) ||
errors.Any(e => e.Tag == ErrorType.NoVerbSelectedError) ||
errors.Any(e => e.Tag == ErrorType.BadVerbSelectedError))
{
HelpText helpTextBody = new HelpText
{
AdditionalNewLineAfterOption = true,
AddDashesToOption = true,
MaximumDisplayWidth = DisplayWidth
};
helpTextBody.AddDashesToOption = false;
helpTextBody.AddVerbs(typeInfo.Choices.ToArray());
List <string> helpLines = new List <string>(helpTextBody.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None));
//direct base type == VerbBase means first level - show version option
if (typeInfo.Choices.Any() &&
typeInfo.Choices.First().BaseType != typeof(VerbBase))
{
RemoveVersion(helpLines);
}
else
{
AddDashesToVersion(helpLines);
}
AddDashesToHelp(helpLines);
helpText.AddRange(helpLines);
}
else
{
if (typeInfo.Current.GetCustomAttribute <UseChildVerbsAsCategoryAttribute>() != null)
{
ChildVerbsAttribute childVerbs = typeInfo.Current.GetCustomAttribute <ChildVerbsAttribute>();
IEnumerable <Type> childVerbTypes = (childVerbs?.Types ?? Enumerable.Empty <Type>())
.Concat(dynamicVerbFactory.GetDynamicVerbs(typeInfo.Current));
foreach (Type childVerbType in childVerbTypes)
{
HelpText helpTextBody = new HelpText
{
AdditionalNewLineAfterOption = true,
AddDashesToOption = true,
MaximumDisplayWidth = DisplayWidth
};
helpTextBody.AddPreOptionsLine(childVerbType.GetCustomAttribute <VerbAttribute>().HelpText);
if (typeof(TypeInfo).GetMethod("Create", BindingFlags.NonPublic | BindingFlags.Static,
null, new[] { typeof(Type) }, null)
?.Invoke(null, new object[] { childVerbType }) is TypeInfo childTypeInfo &&
typeof(Parsed <object>).GetConstructor(BindingFlags.NonPublic | BindingFlags.Instance, null,
new[]
{
typeof(object),
typeof(TypeInfo)
}, null)?.Invoke(new[] { null, childTypeInfo })
is ParserResult <object> childResult)
{
helpTextBody.AddOptions(childResult);
}
List <string> helpLines = new List <string>(helpTextBody.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None));
RemoveVersion(helpLines);
AddDashesToHelp(helpLines);
helpText.AddRange(helpLines);
}
}
else
{
HelpText helpTextBody = new HelpText
{
AdditionalNewLineAfterOption = true,
AddDashesToOption = true,
MaximumDisplayWidth = DisplayWidth
};
helpTextBody.AddOptions(result);
List <string> helpLines = new List <string>(helpTextBody.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None));
RemoveVersion(helpLines);
AddDashesToHelp(helpLines);
helpText.AddRange(helpLines);
}
}
}
void RemoveVersion(List <string> list)
{
string versionLine = list.FirstOrDefault(l => l.Trim().StartsWith("version ", StringComparison.Ordinal) ||
l.Trim().StartsWith("--version ", StringComparison.Ordinal));
if (!string.IsNullOrEmpty(versionLine))
{
int index = list.IndexOf(versionLine);
do
{
list.RemoveAt(index - 1);
} while (!string.IsNullOrEmpty(list[index - 1]));
}
}
void AddDashesToHelp(List <string> list)
{
string helpLine = list.FirstOrDefault(l => l.Trim().StartsWith("help ", StringComparison.Ordinal));
if (!string.IsNullOrEmpty(helpLine))
{
int index = helpLine.IndexOf("help ", StringComparison.Ordinal);
list[list.IndexOf(helpLine)] = helpLine.Substring(0, index) + "--help " + helpLine.Substring(index + "help ".Length + 2);
}
}
void AddDashesToVersion(List <string> list)
{
string versionLine = list.FirstOrDefault(l => l.Trim().StartsWith("version ", StringComparison.Ordinal) &&
string.IsNullOrWhiteSpace(list[list.IndexOf(l) - 1]));
if (!string.IsNullOrEmpty(versionLine))
{
int index = versionLine.IndexOf("version ", StringComparison.Ordinal);
list[list.IndexOf(versionLine)] = versionLine.Substring(0, index) + "--version " + versionLine.Substring(index + "version ".Length + 2);
}
}
void GenerateHelpTextFooter()
{
UsageExample[] examples = GetExamplesFromVerb(typeInfo.Current);
if (examples.Any())
{
HelpText helpTextFooter = new HelpText
{
AdditionalNewLineAfterOption = true,
AddDashesToOption = true,
MaximumDisplayWidth = DisplayWidth
};
helpTextFooter.AddPostOptionsLine("Examples:");
helpTextFooter.AddPostOptionsLine(string.Empty);
string commandName = assembly.GetName().Name.ToLowerInvariant();
foreach (UsageExample usageExample in examples)
{
PrintExample(helpTextFooter, usageExample, commandName);
}
if (typeInfo.Current.GetCustomAttribute <UseChildVerbsAsCategoryAttribute>() != null)
{
ChildVerbsAttribute childVerbs = typeInfo.Current.GetCustomAttribute <ChildVerbsAttribute>();
IEnumerable <Type> childVerbTypes = (childVerbs?.Types ?? Enumerable.Empty <Type>())
.Concat(dynamicVerbFactory.GetDynamicVerbs(typeInfo.Current));
IEnumerable <(string verbName, UsageExample[] examples)> childExamples = childVerbTypes.Select(t => (t.GetCustomAttribute <VerbAttribute>().Name,
GetExamplesFromVerb(t)))
.Where(e => e.Item2.Any());
foreach ((string verbName, UsageExample[] usageExamples) in childExamples)
{
helpTextFooter.AddPostOptionsLine(string.Empty);
helpTextFooter.AddPostOptionsLine($"For {verbName}s:");
helpTextFooter.AddPostOptionsLine(string.Empty);
foreach (UsageExample usageExample in usageExamples)
{
PrintExample(helpTextFooter, usageExample, commandName);
}
}
}
helpText.AddRange(helpTextFooter.ToString().Split(new[] { Environment.NewLine }, StringSplitOptions.None));
}
void PrintExample(HelpText helpTextFooter, UsageExample usageExample, string commandName)
{
helpTextFooter.AddPostOptionsLine(usageExample.HelpText.EndsWith(":", StringComparison.Ordinal)
? usageExample.HelpText
: $"{usageExample.HelpText}:");
helpTextFooter.AddPostOptionsLine($@"{commandName} {usageExample.Command}");
helpTextFooter.AddPostOptionsLine(string.Empty);
}
UsageExample[] GetExamplesFromVerb(Type verbType)
{
PropertyInfo property = verbType.GetProperties(BindingFlags.Public | BindingFlags.Static)
.FirstOrDefault(p => p.GetCustomAttribute <UsageAttribute>() != null &&
p.PropertyType ==
typeof(IEnumerable <UsageExample>));
UsageExample[] verbExamples =
((IEnumerable <UsageExample>)property?.GetValue(null) ?? Enumerable.Empty <UsageExample>())
.ToArray();
return(verbExamples);
}
}
}