using System.Linq;

using ScriptCs.Contracts;

namespace ScriptCs.ReplCommands

{

using System;

using System.Globalization;

public class AliasCommand : IReplCommand

{

private readonly IConsole _console;

public AliasCommand(IConsole console)

{

Guard.AgainstNullArgument("console", console);

_console = console;

}

public string Description

{

get { return "Allows you to alias a command with a custom name"; }

}

public string CommandName

{

get { return "alias"; }

}

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

{

Guard.AgainstNullArgument("repl", repl);

if (args == null || args.Length != 2)

{

_console.WriteLine("You must specifiy the command name and alias, e.g. :alias \"clear\" \"cls\"");

return null;

}

var commandName = args[0].ToString();

var alias = args[1].ToString();

if (repl.Commands.Any(x => string.Equals(x.Key, alias, StringComparison.InvariantCultureIgnoreCase)))

{

var message = string.Format(

CultureInfo.InvariantCulture,

"\"{0}\" cannot be used as an alias since it is the name of an existing command.",

alias);

_console.WriteLine(message);

return null;

}

IReplCommand command;

if (!repl.Commands.TryGetValue(commandName, out command))

{

var message = string.Format(

CultureInfo.InvariantCulture, "There is no command named or aliased \"{0}\".", alias);

_console.WriteLine(message);

return null;

}

repl.Commands[alias] = command;

_console.WriteLine(string.Format("Aliased \"{0}\" as \"{1}\".", commandName, alias));

return null;

}

}

}