private object Help([NotNull] params object[] args)
{
if (args == null)
{
throw new ArgumentNullException("args");
}
if (args.Length == 1)
{
Console.WriteLine("These shell commands are defined internally.");
Console.WriteLine("Type `help' to see this list.");
Console.WriteLine("Type `help name' to find out more about the function `name'.");
Console.WriteLine("Type `help shell' to find out more about the shell in general.");
Console.WriteLine("Optionaly: Type `man name' or `man shell' to see extended documentation.");
Console.WriteLine();
// Generic help
var funcs = NativeFunction.GetNames();
var lines = TerminalTableBuilder.BuildTable(funcs, Console.BufferWidth, 2);
foreach (var line in lines)
{
Console.WriteLine(line);
}
}
else if (args.Length >= 2)
{
var arg = args[1] as string;
if (arg == null)
{
throw new NullReferenceException("arg");
}
// Help for exact function
if (string.Equals(arg, "shell"))
{
Console.WriteLine("Short shell information.");
Console.WriteLine("Use 'left' and right' arrow to change caret position.");
Console.WriteLine("Use 'up' and 'down' arrow to navigate in the hostory.");
Console.WriteLine("Use 'tab' to complete current word. Or press 'tab tab' to see the list of commands which starts with curent word");
Console.WriteLine("Use 'enter' to execute whole expression.");
}
else
{
var fun = NativeFunction.TryLockup(arg);
if (fun != null)
{
if (fun.help != null)
{
Console.WriteLine(fun.help);
}
else
{
Console.WriteLine(string.Format("Command '{0}' does not have help", fun.name));
}
}
else
{
Console.WriteLine(string.Format("Command '{0}' does not exists", arg));
}
}
}
return(null);
}