Improve existing features

Improve command line experience:
- No longer need to provide host when running a server
- More helpful error messages for invalid arguments

Add player collision

Reduce RPC message sizes by having `Board::draw` not send the escape character to move the cursor to the top left, instead the client can do that

cpp-console-game/Board.cpp

@@ -15,7 +15,7 @@ namespace ConsoleGame
 
   std::string Board::draw()
   {
-    std::string board = "\033[H";  // Move cursor to the top left corner
+    std::string board;
 
     for (auto row : cells)
     {

cpp-console-game/GameClient.cpp

@@ -11,6 +11,12 @@ namespace ConsoleGame
   {
     playerId = addPlayer();
 
+    if (playerId == -1)
+    {
+      std::cerr << "Failed to add player" << std::endl;
+      return;
+    }
+
     std::thread renderThread(&GameClient::renderLoop, this);
     std::thread inputThread(&GameClient::inputLoop, this);
 
@@ -29,7 +35,8 @@ namespace ConsoleGame
       // replace all "|" with newline
       std::replace(res.begin(), res.end(), '|', '\n');
 
-      std::cout << res << std::endl;
+      std::cout << "\033[H" << res << std::endl;
+
       std::this_thread::sleep_for(std::chrono::milliseconds(100));
     }
   }

cpp-console-game/GameState.cpp

@@ -15,6 +15,12 @@ namespace ConsoleGame
   {
     std::lock_guard<std::mutex> lock(mutex);
 
+    // Check if the game is full
+    if (players.size() >= board.getWidth() * board.getHeight())
+    {
+      return -1;
+    }
+
     // Add a player to the game at a random position
     int x, y;
     do
@@ -46,8 +52,12 @@ namespace ConsoleGame
   {
     std::lock_guard<std::mutex> lock(mutex);
 
-    // Check if the new position is out of bounds
+    // Check if the new position is out of bounds or occupied
-    if (newPos.first < 0 || newPos.first >= board.getWidth() || newPos.second < 0 || newPos.second >= board.getHeight())
+    if (newPos.first < 0 ||
+        newPos.first >= board.getWidth() ||
+        newPos.second < 0 ||
+        newPos.second >= board.getHeight() ||
+        board.getCell(newPos.first, newPos.second) != board.getFill())
     {
       return;
     }

cpp-console-game/main.cpp

@@ -5,15 +5,14 @@
 
 int main(int argc, char **argv)
 {
-  if (argc < 4)
+  if (argc < 3)
   {
-    std::cerr << "Usage: " << argv[0] << "<client/server> <port> <host>" << std::endl;
+    std::cerr << "Usage: " << argv[0] << " <client/server> <port>" << std::endl;
     return EXIT_FAILURE;
   }
 
   std::string mode = argv[1];
   int port = std::stoi(argv[2]);
-  std::string host = argv[3];
 
   if (mode == "server")
   {
@@ -21,11 +20,20 @@ int main(int argc, char **argv)
   }
   else if (mode == "client")
   {
+    if (argc < 4)
+    {
+      std::cerr << "Usage: " << argv[0] << " client <port> <host>" << std::endl;
+      return EXIT_FAILURE;
+    }
+
+    std::string host = argv[3];
+
     ConsoleGame::GameClient client(host, port);
   }
   else
   {
-    std::cerr << "Invalid mode" << std::endl;
+    std::cerr << "Invalid mode \"" << mode << "\"" << std::endl;
+    std::cerr << "Usage: " << argv[0] << " <client/server> <port>" << std::endl;
     return EXIT_FAILURE;
   }