Use clipp for arg parsing

src/main.cpp

@@ -1,16 +1,27 @@
+#include <clipp.hpp>
 #include <cstdio>
+#include <iostream>
 #include <wassembler.hpp>
 
 int main(int argc, char ** argv)
 {
-	if (argc != 2)
+	std::string inputFile;
+	unsigned memorySize = 1024;
+
+	auto cli = (
+		clipp::value("input wasm file").set(inputFile),
+		clipp::option("-m", "--memory-size") & clipp::value("memory size", memorySize)
+	);
+
+	if (!clipp::parse(argc, argv, cli))
 	{
-		std::printf("Usage: %s [filename.wasm]\n", argv[0]);
+		std::cout << clipp::make_man_page(cli, argv[0]);
 		return 1;
 	}
 
 	Wassembler wassembler;
-	if (!wassembler.LoadFromFile(argv[1]))
+	wassembler.SetMemorySize(memorySize);
+	if (!wassembler.LoadFromFile(inputFile))
 	{
 		exit(1);
 	}

src/wassembler.cpp

@@ -79,6 +79,11 @@ bool Wassembler::LoadTokens(std::vector<std::string> const & lines, std::vector<
 	return !(syntaxError || tokenizationError);
 }
 
+void Wassembler::SetMemorySize(unsigned const size)
+{
+	config.memorySize = size;
+}
+
 bool Wassembler::LoadFromFile(std::string const & filePath)
 {
 	std::vector<std::string> lines;
@@ -108,8 +113,6 @@ bool Wassembler::LoadFromFile(std::string const & filePath)
 	}
 
 	vm.LoadCode(std::move(codePtr));
-
-	Configuration config;
 	vm.LoadConfiguration(config);
 
 	return true;