Add help message display.

src/main/java/moe/nekojimi/friendcloud/Main.java

@@ -44,9 +44,20 @@ public class Main
 
     public static void main(String[] argv)
 	{
-        instance = new Main();
 		Args args = new Args();
-        JCommander.newBuilder().addObject(args).build().parse(argv);
+		JCommander jCommander = JCommander.newBuilder()
+				.addObject(args)
+				.programName("FriendCloud")
+				.build();
+		jCommander.parse(argv);
+
+		if (args.help)
+		{
+			jCommander.usage();
+			return;
+		}
+
+		instance = new Main();
 		instance.args = args;
 
 		System.setProperty(SimpleLogger.DEFAULT_LOG_LEVEL_KEY, "Info");
@@ -66,6 +77,7 @@ public class Main
 
     private void run() throws IOException
 	{
+
 		DataStore dataStore = new StupidJSONFileStore(new File(args.storageLocation));
 		controller = new Controller(dataStore);
 
@@ -216,23 +228,32 @@ public class Main
 	@SuppressWarnings("FieldCanBeLocal")
 	public static class Args
 	{
-		@Parameter(names="-share")
+		@Parameter(names="-help", help = true, description = "Display this help message and quit.")
+		private boolean help = false;
+
+		@Parameter(names="-share", description = "Add a file path to be shared once the application starts.")
 		private List<String> sharedFilePaths = new ArrayList<>();
 
-		@Parameter(names="-known-peer")
+		@Parameter(names="-known-peer", description = "Add a URI (e.g. tcp://192.168.1.69:42069) of a known peer that will be connected to on first run.")
 		private List<String> knownPeers = new ArrayList<>();
 
-		@Parameter(names="-tcp-port")
+		@Parameter(names="-tcp-port", description = "The TCP port to listen for connections on.")
 		private int tcpPort = 7777;
 
-		@Parameter(names="-no-upnp")
+		@Parameter(names="-advertise-address", description = "Manually add a URI (e.g. tcp://192.168.1.69:42069) that will be given to other peers to connect to this peer with. Useful to provide your global IP if UPnP doesn't work.")
+		private List<String> advertiseAddresses = new ArrayList<>();
+
+		@Parameter(names="-no-upnp", description = "Disables UPnP.")
 		private boolean noUpnp = false;
 
-		@Parameter(names="-create-network")
-		private boolean createNetwork = false;
+//		@Parameter(names="-create-network")
+//		private boolean createNetwork = false;
 
-		@Parameter(names = "-storage")
-		private String storageLocation = ".";
+		@Parameter(names = "-storage", description = "The location on disk where the local copy of the state database will be stored.")
+		private String storageLocation = "./storage";
+
+		@Parameter(names = "-artificial-lag", description = "Set to a value above 0 to introduce artificial delay when sending messages, in milliseconds. Use for testing only!")
+		private int artificialLagMs = 0;
 
 		public List<String> getSharedFilePaths()
 		{
@@ -254,14 +275,24 @@ public class Main
 			return noUpnp;
 		}
 
-		public boolean isCreateNetwork()
-		{
-			return createNetwork;
-		}
+//		public boolean isCreateNetwork()
+//		{
+//			return createNetwork;
+//		}
 
 		public String getStorageLocation()
 		{
 			return storageLocation;
 		}
+
+		public List<String> getAdvertiseAddresses()
+		{
+			return advertiseAddresses;
+		}
+
+		public int getArtificialLagMs()
+		{
+			return artificialLagMs;
+		}
 	}
 }