Move help to a central location; update help

SabreHelper/Build.cs

@@ -1,4 +1,8 @@
-namespace SabreTools.Helper
+using System;
+using System.Diagnostics;
+using System.Reflection;
+
+namespace SabreTools.Helper
 {
 	public class Build
 	{
@@ -6,5 +10,90 @@
 		{
 			get { return "0.4.0.0"; }
 		}
+
+		/// <summary>
+		/// Show the help dialog for a given class
+		/// </summary>
+		public static void Help()
+		{
+			//http://stackoverflow.com/questions/14849367/how-to-determine-calling-method-and-class-name
+			StackTrace st = new StackTrace();
+			string className = st.GetFrame(1).GetMethod().ReflectedType.Name;
+
+			switch (className)
+			{
+				case "DATabase":
+					Console.Clear();
+					Console.Write(@"
+DATabase - Import and Generate DAT files
+-----------------------------------------
+Usage: DATabase [option] [filename|dirname|<system=sy,...> <source=so,...>]
+
+Options:
+  -h, -?, --help	Show this help
+  -i, --import		Start tool in import mode
+			  A filename or folder is required to run
+  -g, --generate	Start tool in generate mode
+			  system=sy,...		List of system IDs
+			  source=so,...		List of source IDs
+			  out=dir			Output directory
+			  -nr, --no-rename	Don't auto-rename games
+			  -old, --romvault	Produce a DAT in RV format
+  -ga, --generate-all	Start tool in generate all mode
+  -lso, --list-sources	List all sources (id <= name)
+  -lsy, --list-systems	List all systems (id <= name)
+  -cr, --convert-rv	Convert an XML DAT to RV
+  -cx, --convert-xml	Convert a RV DAT to XML
+			  Both converters require a filename or folder
+  -l, --log		Enable logging of program output
+");
+
+					Console.Write("\nPress any key to continue...");
+					Console.ReadKey();
+					Console.Write(@"
+Database Options:
+  -a, --add		Add a new system or source to the database
+			  manu=mn		Manufacturer name (system only)
+			  system=sy		System name (system only)
+			  source=sr		Source name (source only)
+			  url=ul		URL (source only)
+  -r, --remove	Remove a system or source from the database
+			  system=sy		System ID
+			  source=so			Source ID
+
+Filenames and directories can't start with '-', 'system=', or 'source='
+unless prefixed by 'input='");
+					Console.Write("\nPress any key to continue...");
+					Console.ReadKey();
+					break;
+				case "DatSplit":
+					Console.WriteLine(@"DatSplit - Split DAT files by file extension
+-----------------------------------------
+Usage: DatSplit.exe <filename> <ext> <ext>");
+					break;
+				case "Headerer":
+					Console.WriteLine(@"Headerer - Remove and restore rom headers
+-----------------------------------------
+Usage: Headerer [option] [filename|dirname]
+
+Options:
+  -e			Detect and remove mode
+  -r			Restore header to file based on SHA-1");
+					break;
+				case "SingleGame":
+					Console.WriteLine(@"SingleGame - Process DATs for use in server environments
+-----------------------------------------
+Usage: SingleGame.exe <filename> [-r=rootdir|-n]
+
+Options:
+    -r=rootdir		Set the directory name for path size
+    -n			Disable single-game mode
+");
+					break;
+				default:
+					Console.Write("This is the default help output");
+					break;
+			}
+		}
 	}
 }