TGS3 (#3)

Let's just get this merged instead of having a massive PR

Original PR: tgstation/tgstation#26534

TGCommandLine/Program.cs

@@ -0,0 +1,130 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using TGServiceInterface;
+
+namespace TGCommandLine
+{
+	enum ExitCode
+	{
+		Normal = 0,
+		ConnectionError = 1,
+		BadCommand = 2,
+		ServerError = 3,
+	}
+
+	abstract class Command
+	{
+		public string Keyword { get; protected set; }
+		public Command[] Children { get; protected set; } = { };
+		public int RequiredParameters { get; protected set; }
+		public abstract ExitCode Run(IList<string> parameters);
+		public virtual void PrintHelp()
+		{
+			var Prefixes = new List<string>();
+			var Postfixes = new List<string>();
+			int MaxPrefixLen = 0;
+			foreach (var c in Children)
+			{
+				var ns = c.Keyword + " " + c.GetArgumentString();
+				MaxPrefixLen = Math.Max(MaxPrefixLen, ns.Length);
+				Prefixes.Add(ns);
+				Postfixes.Add(c.GetHelpText());
+			}
+
+			var Final = new List<string>();
+			for(var I = 0; I < Prefixes.Count; ++I)
+			{
+				var lp = Prefixes[I];
+				for (; lp.Length < MaxPrefixLen + 1; lp += " ") ;
+				Final.Add(lp + "- " + Postfixes[I]);
+			}
+			Final.Sort();
+			Final.ForEach(Console.WriteLine);
+		}
+		protected virtual string GetArgumentString()
+		{
+			return "";
+		}
+		protected abstract string GetHelpText();
+	}
+
+	class Program
+	{
+		static ExitCode RunCommandLine(IList<string> argsAsList)
+		{
+			var res = Server.VerifyConnection();
+			if (res != null)
+			{
+				Console.WriteLine("Unable to connect to service!");
+				return ExitCode.ConnectionError;
+			}
+			try
+			{
+				return new RootCommand().Run(argsAsList);
+			}
+			catch
+			{
+				Console.WriteLine("Service connection interrupted!");
+				return ExitCode.ConnectionError;
+			};
+		}
+		public static string ReadLineSecure()
+		{
+			string result = "";
+			while (true)
+			{
+				ConsoleKeyInfo i = Console.ReadKey(true);
+				if (i.Key == ConsoleKey.Enter)
+				{
+					break;
+				}
+				else if (i.Key == ConsoleKey.Backspace)
+				{
+					if (result.Length > 0)
+					{
+						result = result.Substring(0, result.Length - 1);
+						Console.Write("\b \b");
+					}
+				}
+				else
+				{
+					result += i.KeyChar;
+					Console.Write("*");
+				}
+			}
+			return result;
+		}
+
+		static int Main(string[] args)
+		{
+			if (args.Length != 0)
+				return (int)RunCommandLine(new List<string>(args));
+
+			//interactive mode
+			while (true)
+			{
+				Console.Write("Enter command: ");
+				var NextCommand = Console.ReadLine();
+				switch (NextCommand.ToLower())
+				{
+					case "quit":
+					case "exit":
+						return (int)ExitCode.Normal;
+					default:
+						//linq voodoo to get quoted strings
+						var formattedCommand = NextCommand.Split('"')
+										   .Select((element, index) => index % 2 == 0  // If even index
+										   ? element.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries)  // Split the item
+										   : new string[] { element })  // Keep the entire item
+										   .SelectMany(element => element).ToList();
+
+						formattedCommand = formattedCommand.Select(x => x.Trim()).ToList();
+						formattedCommand.Remove("");
+						RunCommandLine(formattedCommand);
+						break;
+				}
+			}
+		}
+	}
+}