Parse program arguments using Boost::program_options and read the specified input file

src/main.cpp

@@ -1,4 +1,46 @@
 #include <iostream>
+#include <fstream>
+#include <string>
+#include <boost/program_options.hpp>
+#include "lexer/Lexer.h"
+
+namespace po = boost::program_options;
+
+int main(int argc, char **argv) {
+    // Argument parsing straight from the Boost manual: https://www.boost.org/doc/libs/1_60_0/doc/html/program_options/tutorial.html
+
+    // Declare the supported options.
+    po::options_description desc("Allowed options");
+
+    // TODO: What the fuck is this syntax?
+    desc.add_options()
+            ("help,h", "Show this help message")
+            ("input,i", po::value<std::string>(), "Input file")
+            ("output,o", po::value<std::string>(), "Output file");
+
+    po::variables_map vm;
+    po::store(po::parse_command_line(argc, argv, desc), vm);
+    po::notify(vm);
+
+    if (vm.count("help")) {
+        std::cout << desc << std::endl;
+        return 1;
+    }
+
+    // Read the input file
+    std::ifstream ifs;
+    std::string input_string;
+    ifs.open(vm["input"].as<std::string>(), std::ios_base::in);
+    if (!ifs) {
+        std::cout << "Failed to read input file!" << std::endl;
+        return -1;
+    }
+    while (!ifs.eof()) {
+        std::string line;
+        getline(ifs, line);
+        input_string += line + '\n';
+    }
+    ifs.close();
 
 int main() {
     std::cout << "Hello, World!" << std::endl;