using System.Linq;

using ScriptCs.Contracts;

namespace ScriptCs.ReplCommands

{

public class HelpCommand : IReplCommand

{

private readonly IConsole _console;

public HelpCommand(IConsole console)

{

Guard.AgainstNullArgument("console", console);

_console = console;

}

public string Description

{

get { return "Shows this help."; }

}

public string CommandName

{

get { return "help"; }

}

public object Execute(IRepl repl, object[] args)

{

Guard.AgainstNullArgument("repl", repl);

_console.WriteLine("The following commands are available in the REPL:");

foreach (var command in repl.Commands.OrderBy(x => x.Key))

{

_console.WriteLine(string.Format(":{0,-15}{1,10}", command.Key, command.Value.Description));

}

return null;

}

}

}