add 'tps' command line argument

src/engine/Engine.hpp

@@ -50,6 +50,7 @@ struct CoreParameters {
     std::filesystem::path userFolder = ".";
     std::filesystem::path scriptFile;
     std::filesystem::path projectFolder;
+    int tps = 20;
 };
 
 using OnWorldOpen = std::function<void(std::unique_ptr<Level>, int64_t)>;

src/engine/ServerMainloop.cpp

@@ -15,8 +15,6 @@ using namespace std::chrono;
 
 static debug::Logger logger("mainloop");
 
-inline constexpr int TPS = 20;
-
 ServerMainloop::ServerMainloop(Engine& engine) : engine(engine) {
 }
 
@@ -39,7 +37,7 @@ void ServerMainloop::run() {
         "script:" + coreParams.scriptFile.filename().u8string()
     );
 
-    double targetDelta = 1.0 / static_cast<double>(TPS);
+    double targetDelta = 1.0 / static_cast<double>(coreParams.tps);
     double delta = targetDelta;
     auto begin = system_clock::now();
     auto startupTime = begin;

src/util/ArgsReader.hpp

@@ -33,5 +33,14 @@ namespace util {
             last = argv[pos];
             return argv[pos++];
         }
+
+        int nextInt() {
+            auto text = next();
+            try {
+                return std::stoi(text);
+            } catch (const std::exception& e) {
+                throw std::runtime_error(e.what());
+            }
+        }
     };
 }

src/util/command_line.cpp

@@ -4,6 +4,7 @@
 #include <functional>
 #include <vector>
 #include <string>
+#include <iomanip>
 
 #include "io/engine_paths.hpp"
 #include "util/ArgsReader.hpp"
@@ -15,10 +16,17 @@ class ArgC {
     public:
         std::string keyword;
         std::function<bool()> execute;
+        std::string args;
         std::string help;
-        ArgC(const std::string& keyword, std::function<bool()> execute, const std::string& help) {
+        ArgC(
+            const std::string& keyword,
+            std::function<bool()> execute,
+            const std::string& args,
+            const std::string& help
+        ) {
             this->keyword = keyword;
             this->execute = execute;
+            this->args = args;
             this->help = help;
         }
 };
@@ -31,42 +39,47 @@ static bool perform_keyword(
         ArgC("--res", [&params, &reader]() -> bool {
             params.resFolder = reader.next();
             return true;
-        }, "<path> - set resources directory."),
+        }, "<path>", "set resources directory."),
         ArgC("--dir", [&params, &reader]() -> bool {
             params.userFolder = reader.next();
             return true;
-        }, "<path> - set userfiles directory."),
+        }, "<path>", "set userfiles directory."),
         ArgC("--project", [&params, &reader]() -> bool {
             params.projectFolder = reader.next();
             return true;
-        }, "<path> - set project directory."),
+        }, "<path>", "set project directory."),
         ArgC("--test", [&params, &reader]() -> bool {
             params.testMode = true;
             params.scriptFile = reader.next();
             return true;
-        }, "<path> - test script file."),
+        }, "<path>", "test script file."),
         ArgC("--script", [&params, &reader]() -> bool {
             params.testMode = false;
             params.scriptFile = reader.next();
             return true;
-        }, "<path> - main script file."),
+        }, "<path>", "main script file."),
         ArgC("--headless", [&params]() -> bool {
             params.headless = true;
             return true;
-        }, "- run in headless mode."),
+        }, "", "run in headless mode."),
+        ArgC("--tps", [&params, &reader]() -> bool {
+            params.tps = reader.nextInt();
+            return true;
+        }, "<tps>", "headless mode tick-rate (default - 20)."),
         ArgC("--version", []() -> bool {
             std::cout << ENGINE_VERSION_STRING << std::endl;
             return false;
-        }, "- display the engine version."),
+        }, "", "display the engine version."),
         ArgC("--help", []() -> bool {
             std::cout << "VoxelCore v" << ENGINE_VERSION_STRING << "\n\n";
             std::cout << "Command-line arguments:\n";
             for (auto& a : argumentsCommandline) {
-                std::cout << a.keyword << " " << a.help << std::endl;
+                std::cout << std::setw(20) << std::left << (a.keyword + " " + a.args);
+                std::cout << "- " << a.help << std::endl;
             }
             std::cout << std::endl;
             return false;
-        }, "- display this help.")
+        }, "", "display this help.")
     };
     for (auto& a : argumentsCommandline) {
         if (a.keyword == keyword) {