mydelta prototype implementation of `delta`

mydelta.cpp

// Compile with:
// g++ -O3 -march=native -o mydelta mydelta.cpp
// Use it like:
// git diff | ./mydelta

#include <iostream>
#include <string>
#include <regex>

// ANSI escape codes for colors
const std::string RED = "\033[31m";
const std::string GREEN = "\033[32m";
const std::string YELLOW = "\033[33m";
const std::string BLUE = "\033[34m";
const std::string MAGENTA = "\033[35m";
const std::string CYAN = "\033[36m";
const std::string RESET = "\033[0m";

int main() {
    std::string line;
    std::regex diffRegex("^@@ -([0-9]+),([0-9]+) \\+([0-9]+),([0-9]+) @@");
    std::regex addRegex("^\\+");
    std::regex removeRegex("^-");

    while (std::getline(std::cin, line)) {
        // Colorize diff header
        if (std::regex_match(line, diffRegex)) {
            std::cout << CYAN << line << RESET << std::endl;
        }
        // Colorize added lines
        else if (std::regex_match(line, addRegex)) {
            std::cout << GREEN << line << RESET << std::endl;
        }
        // Colorize removed lines
        else if (std::regex_match(line, removeRegex)) {
            std::cout << RED << line << RESET << std::endl;
        }
        // Print other lines as is
        else {
            std::cout << line << std::endl;
        }
    }

    return 0;
}

Note: one should use the following regex for better coloring:

    std::regex addRegex("^\\+.*$");
    std::regex removeRegex("^-.*$");