add project args & add vc.get_project_args

res/scripts/stdmin.lua

@@ -1,5 +1,7 @@
 local _vc_headless = __VC_HEADLESS
+local _vc_project_args = __VC_PROJECT_ARGS
 __VC_HEADLESS = nil
+__VC_PROJECT_ARGS = nil
 
 vc = {
     is_headless = function()
@@ -300,6 +302,8 @@ require "core:internal/extensions/file"
 require "core:internal/extensions/table"
 require "core:internal/extensions/string"
 
+vc.get_project_args = table.copy(_vc_project_args)
+
 local bytearray = require "core:internal/bytearray"
 Bytearray = bytearray.FFIBytearray
 Bytearray_as_string = bytearray.FFIBytearray_as_string

src/engine/CoreParameters.hpp

@@ -2,6 +2,7 @@
 
 #include <string>
 #include <filesystem>
+#include <unordered_map>
 
 struct CoreParameters {
     bool headless = false;
@@ -13,4 +14,5 @@ struct CoreParameters {
     std::filesystem::path projectFolder;
     std::string debugServerString;
     int tps = 20;
+    std::unordered_map<std::string, std::string> projectArgs;
 };

src/logic/scripting/lua/lua_engine.cpp

@@ -15,9 +15,12 @@
 #include "usertypes/lua_type_pcmstream.hpp"
 #include "engine/Engine.hpp"
 
-static debug::Logger logger("lua-state");
-static lua::State* main_thread = nullptr;
-static bool headless_mode = false;
+namespace {
+    debug::Logger logger("lua-state");
+    lua::State* main_thread = nullptr;
+    bool headless_mode = false;
+    const std::unordered_map<std::string, std::string>* project_args;
+}
 
 using namespace lua;
 
@@ -151,6 +154,13 @@ void lua::init_state(State* L, StateType stateType) {
     pushboolean(L, headless_mode);
     setglobal(L, "__VC_HEADLESS");
 
+    createtable(L, 0, project_args->size());
+    for (const auto& [key, value] : *project_args) {
+        pushstring(L, value);
+        setfield(L, key);
+    }
+    setglobal(L, "__VC_PROJECT_ARGS");
+
     auto file = "res:scripts/stdmin.lua";
     auto src = io::read_string(file);
     lua::pop(L, lua::execute(L, 0, src, "core:scripts/stdmin.lua"));
@@ -181,6 +191,7 @@ void lua::initialize(const EnginePaths& paths, const CoreParameters& params) {
     logger.info() << LUAJIT_VERSION;
 
     headless_mode = params.headless;
+    project_args = &params.projectArgs;
     main_thread = create_state(
         paths, params.headless ? StateType::SCRIPT : StateType::BASE
     );

src/util/ArgsReader.hpp

@@ -26,6 +26,13 @@ namespace util {
             return last[0] == '-';
         }
 
+        bool isNextKeywordArg() const {
+            if (pos >= argc) {
+                throw std::runtime_error("unexpected end");
+            }
+            return argv[pos][0] == '-';
+        }
+
         std::string next() {
             if (pos >= argc) {
                 throw std::runtime_error("unexpected end");

src/util/command_line.cpp

@@ -97,11 +97,32 @@ static bool perform_keyword(
     throw std::runtime_error("unknown argument " + keyword);
 }
 
+static void parse_project_args(util::ArgsReader& reader, CoreParameters& params) {
+    while (reader.hasNext()) {
+        std::string key = reader.next();
+        if (!reader.isKeywordArg()) {
+            std::cerr << "--<keyword> argument expected" << std::endl;
+            return;
+        }
+        key = key.substr(2);
+        if (!reader.hasNext() || reader.isNextKeywordArg()) {
+            params.projectArgs[std::move(key)] = "";
+            continue;
+        }
+        std::string value = reader.next();
+        params.projectArgs[std::move(key)] = std::move(value);
+    }
+}
+
 bool parse_cmdline(int argc, char** argv, CoreParameters& params) {
     util::ArgsReader reader(argc, argv);
     reader.skip();
     while (reader.hasNext()) {
         std::string token = reader.next();
+        if (token == "--") {
+            parse_project_args(reader, params);
+            return true;
+        }
         if (reader.isKeywordArg()) {
             if (!perform_keyword(reader, token, params)) {
                 return false;