Function main

compendium/tools/SCRCodeGen/Main.cpp:50–125

using codegen::util::WriteToFile;

int
main(int argc, char const** argv, char**)
{
    int returnCode = 0;
    int const FailureReturnCode = -1;

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

    // Validate program options ordering.
    // Return the iterator corresponding to the option argument.
    // Error conditions:
    // 1. the option doesn't exist
    // 2. the option argument doesn't exist
    // 3. the option argument starts with a '-'
    auto findOrThrow = [&args](std::string const& key)
    {
        auto it = std::find(std::begin(args), std::end(args), key);
        if (it == args.end())
        {
            throw std::runtime_error("Cannot find option " + key);
        }
        ++it;
        if (it == args.end())
        {
            throw std::runtime_error("No argument provided for option " + key);
        }
        if (it->at(0) == '-')
        {
            throw std::runtime_error("The argument " + key + " cannot be an option i.e. it cannot start with -");
        }
        return it;
    };

    // Validate if file stream is open. Otherwise, throw
    auto checkFileOpenOrThrow = [](auto const& fstream)
    {
        if (!fstream.is_open())
        {
            throw std::runtime_error("Failed to open manifest file");
        }
    };

    try
    {
        auto it = findOrThrow("--manifest");
        std::string manifestFilePath = *it;
        it = findOrThrow("--out-file");
        std::string outFilePath = *it;
        // --include-headers is followed by 1 or more header strings. Parse until the end of
        // vector or until the next occurence of '-'
        std::vector<std::string> includeHeaderPaths;
        for (it = findOrThrow("--include-headers"); it != args.end() && !(it->at(0) == '-'); ++it)
        {
            includeHeaderPaths.push_back(*it);
        }

        std::ifstream manifestFile(manifestFilePath, std::ifstream::binary | std::ifstream::in);
        checkFileOpenOrThrow(manifestFile);