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"""
Converts JSON files to other formats via templates.
"""

import argparse
import json
import os

from jinja2 import Environment, FileSystemLoader

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int main(int argc, char *argv[]) {
    cxxopts::Options options("dog");

    options.add_options()
        ("n,number", "Show line numbers") 
        ("E,show-ends", "Show line endings")
        ("version", "Show the version")
        ("input_files", "Input file(s) to concatenate", cxxopts::value<std::vector<std::string>>());

    options.parse_positional({"input_files"});

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#include <getopt.h>

int main(int argc, char* argv[]) {
    option longopts[] = {
        {"number", optional_argument, NULL, 'n'}, 
        {"show-ends", optional_argument, NULL, 'E'}, {0}};

    while (1) {
        const int opt = getopt_long(argc, argv, "nE::", longopts, 0);

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const std::vector<std::string_view> args(argv, argv + argc);

const bool modify = has_option(args, "-m");
const std::string_view date = get_option(args, "-d");

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bool has_option(
    const std::vector<std::string_view>& args, 
    const std::string_view& option_name) {
    for (auto it = args.begin(), end = args.end(); it != end; ++it) {
        if (*it == option_name)
            return true;
    }
    
    return false;
}

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std::string_view get_option(
    const std::vector<std::string_view>& args, 
    const std::string_view& option_name) {
    for (auto it = args.begin(), end = args.end(); it != end; ++it) {
        if (*it == option_name)
            if (it + 1 != end)
                return *(it + 1);
    }
    
    return "";

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namespace po = boost::program_options;

// Declare the supported options.
po::options_description desc("Allowed options");
desc.add_options()
    ("help", "produce help message")
    ("compression", po::value<int>(), "set compression level")
;

po::variables_map vm;

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#include <cxxopts.hpp>

// ...

cxxopts::Options options("MyProgram", "One line description of MyProgram");

options.add_options()
  ("d,debug", "Enable debugging") // a bool parameter
  ("i,integer", "Int param", cxxopts::value<int>())
  ("f,file", "File name", cxxopts::value<std::string>())

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for (const auto &file_name : program_options::input_files()) {
    std::ifstream input_file(file_name, std::ios::in);
    
    // ...

    while (std::getline(input_file, line)) {
        if (program_options::show_line_numbers())
            std::cout << std::setw(6) << std::setfill(' ') << line_count++ << "  ";

        // ...

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try {
    program_options::parse(argc, argv);
} catch (const std::exception &x) {
    std::cerr << "dog: " << x.what() << '\n';
    std::cerr << "usage: dog [-n|--number] [-E|--show-ends] <input_file> ...\n";
    return EXIT_FAILURE;
}