Added toggle for Skynet in options

The path for skynet is also changed. It will now only download to the same directory as the main game program is in.

tron.lua

@@ -352,7 +352,7 @@ if useSkynet and (not http.websocket) then
 	error("Skynet is not supported on this version of ComputerCraft.")
 end
 
-local skynetPath = fs.combine(fs.getDir(shell.getRunningProgram()), "skynet")
+local skynetPath = fs.combine(fs.getDir(shell.getRunningProgram()), "skynet.lua")
 local skynetURL = "https://raw.githubusercontent.com/osmarks/skynet/master/client.lua"
 
 if argumentName then
@@ -463,13 +463,14 @@ end
 
 local cwrite = function(text, y, xdiff, wordPosCheck)
 	wordPosCheck = wordPosCheck or #text
-	termsetCursorPos(mathfloor(scr_x / 2 - (#text + (xdiff or 0)) / 2), y or (scr_y - 2))
+	termsetCursorPos(mathfloor(scr_x / 2 - math.floor(0.5 + #text + (xdiff or 0)) / 2), y or (scr_y - 2))
 	term.write(text)
 	return (scr_x / 2) - (#text / 2) + wordPosCheck
 end
 
 local modem, skynet
-if not doGridDemo then
+local setUpModem = function()
+	if not doGridDemo then
 		if useSkynet then
 			if fs.exists(skynetPath) then
 				skynet = dofile(skynetPath)
@@ -503,7 +504,9 @@ if not doGridDemo then
 				error("You should attach a modem.")
 			end
 		end
+	end
 end
+setUpModem()
 
 local transmit = function(port, message)
 	if useSkynet then
@@ -1258,12 +1261,6 @@ local titleScreen = function()
 			"Exit"
 		}
 	end
-	options = {
-		"Grid Demo",
-		"Change Name",
-		"Change Grid",
-		"Back..."
-	}
 	while true do
 		choice, scrollInfo = makeMenu(2, scr_y - #menuOptions, menuOptions, true, scrollInfo)
 		if choice == 1 then
@@ -1273,7 +1270,14 @@ local titleScreen = function()
 		elseif choice == 3 then
 			local _cpos
 			while true do
-				choice, scrollInfo = makeMenu(14, scr_y - #menuOptions, options, true, scrollInfo, _cpos)
+				options = {
+					"Grid Demo",
+					"Change Name",
+					"Change Grid",
+					(useSkynet and "Disable" or "Enable") .. " Skynet",
+					"Back..."
+				}
+				choice, scrollInfo = makeMenu(14, scr_y - #options, options, true, scrollInfo, _cpos)
 				_cpos = choice
 				if choice == 1 then
 					return "demo"
@@ -1292,6 +1296,25 @@ local titleScreen = function()
 					gridID = (gridID % #gridList) + 1
 					gridFore, gridBack = table.unpack(gridList[gridID])
 				elseif choice == 4 then
+					if http.websocket then
+						useSkynet = not useSkynet
+						setUpModem()
+						if skynet and not useSkynet then
+							skynet.socket.close()
+						end
+					else
+						term.clear()
+						term.setTextColor(colors.white)
+						cwrite("Alas, this version of CC", 	-2 + scr_y / 2)
+						cwrite("does not support Skynet.", 	-1 + scr_y / 2)
+						term.setTextColor(colors.lightGray)
+						cwrite("Use CC:Tweaked or CCEmuX", 	 1 + scr_y / 2)
+						cwrite("instead for netplay.", 		 2 + scr_y / 2)
+						cwrite("Press any key to go back.",  4 + scr_y / 2)
+						sleep(0.1)
+						os.pullEvent("key")
+					end
+				elseif choice == 5 then
 					break
 				end
 			end
@@ -1795,7 +1818,11 @@ local main = function()
 			lockInput = false
 			if decision == "start" then
 				mode = "game"
+				if useSkynet then
+					parallel.waitForAny(startGame, skynet.listen)
+				else
 					startGame()
+				end
 			elseif decision == "help" then
 				mode = "help"
 				helpScreen()
@@ -1840,12 +1867,10 @@ else
 			startGame()
 		end
 		term.setCursorPos(1, scr_y)
-	else
-		if useSkynet then
-			parallel.waitForAny(main, skynet.listen)
-			skynet.socket.close()
 	else
 		main()
+		if skynet then
+			skynet.socket.close()
 		end
 	end
 end