refactor: argument (#33)

* refactor(config): remove TOML config loading and replace is_client with host_game

* feat(network): add net_error_message helper and use for error logging

include/Cubed/app.hpp

@@ -68,7 +68,6 @@ private:
 
     void init(int argc, char** argv);
     void handle_argument(int argc, char** argv);
-    void handle_toml();
     auto init_camera();
     auto init_texture();
     auto init_world();

include/Cubed/argument.hpp

@@ -1,11 +1,12 @@
 #pragma once
+#include <optional>
 #include <string>
 namespace Cubed {
 struct Argument {
-    bool is_client = false;
-    int port = 25530;
-    std::string ip{"127.0.0.1"};
-    std::string player{"Unknown"};
-    bool debug_on = true;
+    std::optional<int> port;
+    std::optional<std::string> ip;
+    std::optional<std::string> player;
+    std::optional<bool> debug_on;
+    std::optional<std::string> language;
 };
 } // namespace Cubed

include/Cubed/tools/net_error.hpp

@@ -0,0 +1,78 @@
+#pragma once
+
+#include <asio/error.hpp>
+#include <string_view>
+
+namespace Cubed {
+
+inline std::string_view net_error_message(const asio::error_code& ec) {
+    if (!ec)
+        return "No error.";
+
+#define NET_CASE(err, msg)                                                     \
+    if (ec == asio::error::err) {                                              \
+        return msg;                                                            \
+    }
+
+    // ===== basic_errors =====
+
+    NET_CASE(access_denied, "Access denied.")
+    NET_CASE(address_family_not_supported, "Address family is not supported.")
+    NET_CASE(address_in_use, "Address is already in use.")
+    NET_CASE(already_connected, "Already connected.")
+    NET_CASE(already_started, "Operation already in progress.")
+    NET_CASE(broken_pipe, "Broken pipe.")
+    NET_CASE(connection_aborted, "Connection aborted.")
+    NET_CASE(connection_refused, "Connection refused by the remote host.")
+    NET_CASE(connection_reset, "Connection reset by the remote host.")
+    NET_CASE(bad_descriptor, "Invalid socket or file descriptor.")
+    NET_CASE(fault, "Bad memory address.")
+    NET_CASE(host_unreachable, "Host is unreachable.")
+    NET_CASE(in_progress, "Operation is in progress.")
+    NET_CASE(interrupted, "Operation interrupted.")
+    NET_CASE(invalid_argument, "Invalid argument.")
+    NET_CASE(message_size, "Message is too large.")
+    NET_CASE(name_too_long, "Name is too long.")
+    NET_CASE(network_down, "Network is down.")
+    NET_CASE(network_reset, "Network connection was reset.")
+    NET_CASE(network_unreachable, "Network is unreachable.")
+    NET_CASE(no_descriptors, "Too many open sockets or files.")
+    NET_CASE(no_buffer_space, "No buffer space available.")
+    NET_CASE(no_memory, "Out of memory.")
+    NET_CASE(no_permission, "Operation not permitted.")
+    NET_CASE(no_protocol_option, "Protocol option is unavailable.")
+    NET_CASE(no_such_device, "No such device.")
+    NET_CASE(not_connected, "Socket is not connected.")
+    NET_CASE(not_socket, "Object is not a socket.")
+    NET_CASE(operation_aborted, "Operation cancelled.")
+    NET_CASE(operation_not_supported, "Operation is not supported.")
+    NET_CASE(shut_down, "Connection has been shut down.")
+    NET_CASE(timed_out, "Operation timed out.")
+    NET_CASE(try_again, "Temporary failure. Please try again.")
+    NET_CASE(would_block, "Operation would block.")
+
+    // ===== netdb_errors =====
+
+    NET_CASE(host_not_found, "Host could not be resolved.")
+    NET_CASE(host_not_found_try_again, "Temporary DNS resolution failure.")
+    NET_CASE(no_data, "No address data available.")
+    NET_CASE(no_recovery, "Non-recoverable DNS error.")
+
+    // ===== addrinfo_errors =====
+
+    NET_CASE(service_not_found, "Requested service was not found.")
+    NET_CASE(socket_type_not_supported, "Socket type is not supported.")
+
+    // ===== misc_errors =====
+
+    NET_CASE(already_open, "Resource is already open.")
+    NET_CASE(eof, "Connection closed by the remote host.")
+    NET_CASE(not_found, "Requested item was not found.")
+    NET_CASE(fd_set_failure, "Too many descriptors for select().")
+
+#undef NET_CASE
+
+    return "Unknown network error.";
+}
+
+} // namespace Cubed