main.cpp

#include <unistd.h>

#include <iostream>
#include <string>

#include "defaults.hpp"
#include "shell.hpp"
#include "tokenizer.hpp"

// Prompt user for input.
static inline std::string prompt(char (&directory)[MAX_DIR_SIZE]) {
	std::cout << '[' << directory << "]$ ";
	std::string input{};
	std::getline(std::cin, input);
	return input;
}

// Sends the expression to the shell to be processed.
static inline int send(CPPArgList& expr) { return shell::process(expr); }

// Shell uses integers to communicate with main loop. Switch
// in main loop decides what to do when certain return
// values are encountered.
int main() {
	char directory[MAX_DIR_SIZE];
	getcwd(directory, MAX_DIR_SIZE);
	bool exit = false;
	while (!exit) {
		// Prompt.
		std::string in = prompt(directory);
		// Tokenize.
		CPPArgList expression = tokenizer::tokenize(in);

		// Parse the input and handle the given return code.
		switch (send(expression)) {
		// *= Return codes to reprompt user =*
		case 2:
			std::cerr << "Syntax error in user input." << '\n';
		case 0:
			// Do nothing. Used when we want to reprompt user.
			break;

		// *= Return codes to refresh cwd =*
		case 1:
			getcwd(directory, MAX_DIR_SIZE);
			break;

		// *= Return codes to quit program =*
		case 3:
			std::cerr << "Pipe failed." << '\n';
		case 4:
			std::cerr << "Fork failed." << '\n';
		case -1:
			exit = true;
			break;
		}
	}
	return 0;
}