options!

src/main.cpp

@@ -1,11 +1,54 @@
 #include <iostream>
+#include <stdexcept>
 
 #include "MemoryContext.h"
 #include "Parser.h"
 #include "VM.h"
 
+void parse_options(int argc, char *argv[]) {
+
+    for (int i = 1; i < argc; i++) {
+        std::string arg = argv[i];
+        if (arg.length() < 2 || arg.substr(0, 2) != "--") { throw std::invalid_argument("Can't parse argument " + arg); }
+        std::string rest = arg.substr(2);
+
+        std::vector<std::string> split;
+        {
+            std::istringstream ins(rest);
+            std::string cur;
+            while (std::getline(ins, cur, ' ')) { split.emplace_back(cur); }
+        }
+
+        if (split.empty()) throw std::invalid_argument("Can't parse argument " + arg);
+
+        if (split.at(0) == "log") {
+            if (split.size() != 3) throw std::invalid_argument("Log options must be in format --log TAG LEVEL, instead have: " + arg);
+            try {
+                Logger::set_level(split.at(1), std::stoi(split.at(2)));
+            } catch (...) { throw std::invalid_argument("Log options must be in format --log TAG LEVEL, instead have: " + arg); }
+        } else if (split.size() == 1) {
+            std::string str = split.at(0);
+            if (str.back() != '+' || str.back() != '-') {
+                throw std::invalid_argument("Bool options must be in format --option[+/-], instead have" + arg);
+            }
+            Options::set_bool(str.substr(0, str.length() - 1), str.back() == '+' ? true : false);
+        } else if (split.size() == 2) {
+            try {
+                Options::set_int(split.at(0), std::stoi(split.at(1)));
+            } catch (...) { throw std::invalid_argument("Log options must be in format --log TAG LEVEL, instead have: " + arg); }
+        } else {
+            throw std::invalid_argument("Can't parse argument " + arg);
+        }
+    }
+}
+
 int main(int argc, char *argv[]) {
     try {
+        Options::reset();
+        Logger::reset();
+
+        parse_options(argc, argv);
+
         Handle repl;
         {
             Parser parser;
@@ -21,7 +64,7 @@ int main(int argc, char *argv[]) {
             std::cout << std::endl;
         }
     } catch (const std::exception &e) {
-        std::cerr << "\nUncaught exception: " << e.what() << std::endl;
+        std::cerr << "\nError: " << e.what() << std::endl;
         return -1;
     } catch (...) {
         std::cerr << "Crash!" << std::endl;