Align goto programs to recent changes

netNav_goto

@@ -1,3 +1,10 @@
+local function printUsage()
+	print("Usage:")
+	print(fs.getName(shell.getRunningProgram()).." <remoteMap_name> <x_pos> <y_pos> <z_pos>")
+	print("<remoteMap_name> The name of the remoteMap to connect to and use.")
+	print("<x_pos> <y_pos> <z_pos> The GPS coordinates you want to go to.")
+end
+
 if not netNav then
 	if not os.loadAPI("netNav") then
 		error("could not load netNav API")
@@ -10,18 +17,33 @@ for _, side in ipairs(redstone.getSides()) do
 	end
 end
 
-netNav.setMap("main", 30)
+if not rednet.isOpen() then
+	error("could not open rednet")
+end
 
 local tArgs = {...}
-if #tArgs == 3 then
+
-	for i = 1, #tArgs do
+if type(tArgs[1]) ~= "string" then
+	printError("remoteMap_name: string expected")
+	printUsage()
+	return
+end
+netNav.setMap(tArgs[1], 30)
+ 
+for i = 2, 4 do
 	if tonumber(tArgs[i]) then
 		tArgs[i] = tonumber(tArgs[i])
 	else
-			error("argument "..i.." must be a valid coordinate")
+		printError("argument "..i.." must be a valid coordinate")
+		printUsage()
+		return
 	end
 end
-	print(netNav.goto(tArgs[1], tArgs[2], tArgs[3]))
+
+print("going to coordinates = ", tArgs[2], ",", tArgs[3], ",", tArgs[4])
+local ok, err = netNav.goto(tArgs[2], tArgs[3], tArgs[4])
+if not ok then
+	printError("navigation failed: ", err)
 else
-	error("arguments must be 3 or 4 numbers")
+	print("succesfully navigated to coordinates")
 end

starNav_goto

@@ -1,3 +1,11 @@
+local function printUsage()
+	print("Usage:")
+	print(fs.getName(shell.getRunningProgram()).." <map_name> <x_pos> <y_pos> <z_pos> <(optional)max_distance>")
+	print("<map_name> The name of the remoteMap to connect to and use.")
+	print("<x_pos> <y_pos> <z_pos> The GPS coordinates you want to go to.")
+	print("<(optional)max_distance> The farthest distance allowed to travel from start position.")
+end
+
 if not starNav then
 	if not os.loadAPI("starNav") then
 		error("could not load starNav API")
@@ -5,15 +13,40 @@ if not starNav then
 end
 
 local tArgs = {...}
-if #tArgs == 3 or #tArgs == 4 then
+
-	for i = 1, #tArgs do
+if type(tArgs[1]) ~= "string" then
+	printError("map_name: string expected")
+	printUsage()
+	return
+end
+starNav.setMap(tArgs[1])
+ 
+for i = 2, 4 do
 	if tonumber(tArgs[i]) then
 		tArgs[i] = tonumber(tArgs[i])
 	else
-			error("argument "..i.." must be a valid coordinate")
+		printError("argument "..i.." must be a valid coordinate")
+		printUsage()
+		return
 	end
 end
-	print(starNav.goto(tArgs[1], tArgs[2], tArgs[3], tArgs[4]))
+
+local maxDistance
+if tArgs[5] ~= nil then
+	if tonumber(tArgs[5]) then
+		print("setting max_distance to: ", tArgs[5])
+		maxDistance = tonumber(tArgs[5])
 	else
-	error("arguments must be 3 or 4 numbers")
+		printError("max_distance: number expected")
+		printUsage()
+		return
+	end
+end
+
+print("going to coordinates = ", tArgs[2], ",", tArgs[3], ",", tArgs[4])
+local ok, err = starNav.goto(tArgs[2], tArgs[3], tArgs[4], maxDistance)
+if not ok then
+	printError("navigation failed: ", err)
+else
+	print("succesfully navigated to coordinates")
 end