public static T Parse <T>(Action extraHelp, string[] args) where T : ICLIFlags
{
if (args.Length == 0)
{
FullHelp <T>(extraHelp);
return(null);
}
Type iface = typeof(T);
T instance = Activator.CreateInstance(iface) as T;
if (instance == null)
{
return(null);
}
HashSet <string> presence = new HashSet <string>();
List <string> positionals = new List <string>();
Dictionary <string, string> values = new Dictionary <string, string>();
foreach (string arg in args)
{
if (arg[0] == '-')
{
if (arg[1] == '-')
{
string name = arg.Substring(2);
if (name.ToLower() == "help")
{
FullHelp <T>(extraHelp);
return(null);
}
string value = "true";
if (name.Contains('='))
{
value = name.Substring(name.IndexOf('=') + 1);
name = name.Substring(0, name.IndexOf('='));
}
presence.Add(name);
values[name] = value;
}
else
{
char[] letters = arg.Substring(1).ToArray();
foreach (char letter in letters)
{
if (letter == '=')
{
break;
}
if (letter == '?' || letter == 'h')
{
Help <T>(false);
return(null);
}
presence.Add(letter.ToString());
string value = "true";
if (arg.Contains('='))
{
value = arg.Substring(arg.IndexOf('=') + 1);
}
values[letter.ToString()] = value;
}
}
}
else
{
positionals.Add(arg);
}
}
FieldInfo[] fields = iface.GetFields();
foreach (FieldInfo field in fields)
{
if (field.Name == "Positionals")
{
field.SetValue(instance, positionals.ToArray());
continue;
}
CLIFlagAttribute flagattr = field.GetCustomAttribute <CLIFlagAttribute>(true);
if (flagattr == null)
{
continue;
}
object value = flagattr.Default;
if (flagattr.Positional > -1)
{
if (positionals.Count > flagattr.Positional)
{
value = positionals[flagattr.Positional];
}
}
else
{
if (!presence.Contains(flagattr.Flag))
{
AliasAttribute[] aliasattrs = field.GetCustomAttributes <AliasAttribute>(true).ToArray();
if (aliasattrs != null && aliasattrs.Length > 0)
{
foreach (AliasAttribute aliasattr in aliasattrs)
{
if (presence.Contains(aliasattr.Alias))
{
value = values[aliasattr.Alias];
}
}
}
}
else
{
value = values[flagattr.Flag];
}
}
if (value != null)
{
if (flagattr.Valid != null)
{
if (!flagattr.Valid.Contains(value.ToString()))
{
Console.Error.WriteLine($"Value {value.ToString()} is invalid for flag {flagattr.Flag}, valid values are {string.Join(", ", flagattr.Valid)}");
FullHelp <T>(extraHelp);
return(null);
}
}
if (flagattr.Parser != null && (value as string) != null && flagattr.Parser.Length == 2)
{
Type parserclass = Type.GetType(flagattr.Parser[0]);
MethodInfo method = parserclass.GetMethod(flagattr.Parser[1]);
if (method != null)
{
ParameterInfo[] @params = method.GetParameters();
if (@params.Length == 1 && @params[0].ParameterType.Name == "String" && method.ReturnType.Name == "Object")
{
value = method.Invoke(null, new object[] { (string)value });
}
}
}
field.SetValue(instance, value);
}
else if (flagattr.Required)
{
Console.Error.WriteLine($"Flag {flagattr.Flag} is required");
FullHelp <T>(extraHelp);
return(null);
}
}
return(instance);
}
public static void FullHelp <T>(Action extraHelp) where T : ICLIFlags
{
Type iface = typeof(T);
SortedList <int, string> positionals = new SortedList <int, string>();
int maxpositionals = "positional".Length;
SortedList <int, string> positionalsstr = new SortedList <int, string>();
List <string> helpflags = new List <string>();
int maxflags = "flags".Length;
List <string> helpstrs = new List <string>();
int maxstrs = "help".Length;
List <string> helpdefaults = new List <string>();
FieldInfo[] fields = iface.GetFields();
foreach (FieldInfo field in fields)
{
CLIFlagAttribute flagattr = field.GetCustomAttribute <CLIFlagAttribute>(true);
if (flagattr == null)
{
continue;
}
AliasAttribute[] aliasattrs = field.GetCustomAttributes <AliasAttribute>(true).ToArray();
string required = "";
if (flagattr.Required)
{
required = " (Required)";
}
if (flagattr.NeedsValue)
{
required += " (Needs Value)";
}
List <string> aliases = new List <string>();
string prefix = "--";
if (flagattr.Flag.Length == 1)
{
prefix = "-";
}
if (flagattr.Positional > -1)
{
prefix = "";
}
aliases.Add(prefix + flagattr.Flag);
foreach (AliasAttribute aliasattr in aliasattrs)
{
prefix = "--";
if (aliasattr.Alias.Length == 1)
{
prefix = "-";
}
if (flagattr.Positional > -1)
{
prefix = "";
}
aliases.Add(prefix + aliasattr.Alias);
}
string helpflag = string.Join(" ", aliases);
maxflags = Math.Max(maxflags, helpflag.Length);
string helpstr = $"{flagattr.Help}{required}";
maxstrs = Math.Max(maxstrs, helpstr.Length);
string helpdefault = "";
if (flagattr.Default != null)
{
helpdefault = flagattr.Default.ToString();
}
if (flagattr.Positional > -1)
{
positionals.Add(flagattr.Positional, helpflag);
maxpositionals = Math.Max(maxpositionals, helpflag.Length);
positionalsstr.Add(flagattr.Positional, helpstr);
}
else
{
helpstrs.Add(helpstr);
helpflags.Add(helpflag);
helpdefaults.Add(helpdefault);
}
}
Help <T>(true);
Console.Out.WriteLine();
Console.Out.WriteLine("Flags:");
Console.Out.WriteLine($" {{0, -{maxflags}}} | {{1, -{maxstrs}}} | {{2}}", "flags", "help", "default");
Console.Out.WriteLine("".PadLeft(maxflags + maxstrs + 20, '-'));
for (int i = 0; i < helpstrs.Count; ++i)
{
string helpflag = helpflags[i];
string helpstr = helpstrs[i];
string helpdefault = helpdefaults[i];
Console.Out.WriteLine($" {{0, -{maxflags}}} | {{1, -{maxstrs}}} | {{2}}", helpflag, helpstr, helpdefault);
}
int maxindex = Math.Max("index".Length, ((int)Math.Floor(positionals.Count / 10d)) + 1);
Console.Out.WriteLine();
Console.Out.WriteLine("Positionals:");
Console.Out.WriteLine($" {{0, -{maxindex}}} | {{1, -{maxpositionals}}} | {{2}}", "index", "positional", "help");
Console.Out.WriteLine("".PadLeft(maxindex + maxpositionals + 30, '-'));
foreach (KeyValuePair <int, string> pair in positionals)
{
string positional = pair.Value;
string positionalstr = positionalsstr[pair.Key];
Console.Out.WriteLine($" {{0, -{maxindex}}} | {{1, -{maxpositionals}}} | {{2}}", pair.Key, positional, positionalstr);
}
extraHelp();
}
public static void Help <T>(bool simple) where T : ICLIFlags
{
Type iface = typeof(T);
List <string> positonals = new List <string>();
List <string> singulars = new List <string>();
List <string> help = new List <string>();
bool hasflags = false;
FieldInfo[] fields = iface.GetFields();
foreach (FieldInfo field in fields)
{
CLIFlagAttribute flagattr = field.GetCustomAttribute <CLIFlagAttribute>(true);
if (flagattr == null)
{
continue;
}
if (flagattr.Positional > -1)
{
string x = flagattr.Flag;
if (!flagattr.Required)
{
x = $"[{x}]";
}
positonals.Add(x);
}
else if (!simple)
{
if (flagattr.Flag.Length == 1)
{
singulars.Add(flagattr.Flag);
}
else
{
string x = flagattr.Flag;
if (flagattr.Default != null && flagattr.NeedsValue)
{
x = $"[--{x}[={flagattr.Default}]]";
}
else if (flagattr.NeedsValue)
{
x = $"[--{x}=value]";
}
else
{
x = $"[--{x}]";
}
help.Add(x);
}
}
else
{
hasflags = true;
}
}
string helpstr = AppDomain.CurrentDomain.FriendlyName;
if (simple && hasflags)
{
helpstr += $" [--flags]";
}
else
{
if (singulars.Count > 0)
{
helpstr += $" [-{string.Join("", singulars)}]";
}
if (help.Count > 0)
{
helpstr += $" {string.Join(" ", help)}";
}
}
if (positonals.Count > 0)
{
helpstr += $" {string.Join(" ", positonals)}";
}
Console.Out.WriteLine(helpstr);
}
