Initial code

.gitignore

@@ -32,3 +32,5 @@
 *.out
 *.app
 
+# Build files
+build/*

Makefile

@@ -0,0 +1,4 @@
+build/rug:src/*.cc
+	g++ -o build/rug src/*.cc -Iinclude
+clean:
+	rm build/rug

include/generate.h

@@ -0,0 +1,3 @@
+#pragma once
+
+void generate(short min_char_count, short max_char_count, short min_num_count, short max_num_count, int count);

src/generate.cc

@@ -0,0 +1,34 @@
+#include <iostream>
+#include <random>
+#include <chrono>
+
+void generate(short min_char_count, short max_char_count, short min_num_count, short max_num_count, int count)
+{
+	std::mt19937 engine(std::chrono::system_clock::now().time_since_epoch().count());
+
+	std::uniform_int_distribution<short> char_count_distribution(min_char_count, max_char_count);
+	std::uniform_int_distribution<char> char_distribution('a', 'z');
+	std::uniform_int_distribution<char> num_distribution(0, 9);
+	std::uniform_int_distribution<short> num_count_distribution(min_num_count, max_num_count);
+
+	for(int j = 0; j < count; ++j)
+	{
+		short char_count = char_count_distribution(engine);
+		short num_count = num_count_distribution(engine);
+
+		char_count -= num_count;
+	
+		for(short i = 0; i < char_count; ++i)
+		{
+			std::cout << char_distribution(engine);
+		}
+
+		for(short i = 0; i < num_count; ++i)
+		{
+			char c = num_distribution(engine) + 0x30; // convert to ascii
+			std::cout << c;
+		}
+
+		std::cout << std::endl;
+	}
+}

src/main.cc

@@ -0,0 +1,58 @@
+#include <iostream>
+#include <cxxopts.hpp>
+#include <generate.h>
+
+int main(int argc, char** argv)
+{
+	cxxopts::Options options("rug", "Random username generator");
+
+	options.add_options()
+		("min-char", "The minimum number of characters (including numbers)", cxxopts::value<short>()->default_value("8"))
+		("max-char", "The maximum number of characters (including numbers)", cxxopts::value<short>()->default_value("10"))
+		("min-num", "The minimum number of digits", cxxopts::value<short>()->default_value("0"))
+		("max-num", "The maximum number of digits", cxxopts::value<short>()->default_value("4"))
+		("count", "How many usernames should be generated", cxxopts::value<int>()->default_value("1"))
+		("h,help", "Print help")
+	;
+
+	auto result = options.parse(argc, argv);
+
+	if(result.count("help"))
+	{
+		std::cout << options.help() << std::endl;
+		return 0;
+	}
+
+	short min_char = result["min-char"].as<short>();
+	short max_char = result["max-char"].as<short>();
+	short min_num = result["min-num"].as<short>();
+	short max_num = result["max-num"].as<short>();
+	int count = result["count"].as<int>();
+
+	if(min_char > max_char)
+	{
+		std::cerr << "ERROR: min-char cannot be greater than max-char" << std::endl << std::endl << options.help() << std::endl;
+		return -1;
+	}
+
+	if(min_num > max_num)
+	{
+		std::cerr << "ERROR: min-num cannot be greater than max-num" << std::endl << std::endl << options.help() << std::endl;
+		return -1;
+	}
+
+	if(max_num > min_char)
+	{
+		std::cerr << "ERROR: max-num cannot be greater than min-char" << std::endl << std::endl << options.help() << std::endl;
+		return -1;
+	}
+
+	if(min_char < 0 || max_char < 0 || min_num < 0 || max_num < 0 || count < 0)
+	{
+		std::cerr << "ERROR: negative argument" << std::endl << std::endl << options.help() << std::endl;
+		return -1;
+	}
+
+	generate(min_char, max_char, min_num, max_num, count);
+	return 0;
+}