Basic C++ filesystem utility examples.

cpp_filesystem_utility_examples.cpp

#include <filesystem>
#include <string>

namespace
{
    std::string rootDirectory;
} // namespace

void triangle::fs::setRootDirectory(std::string appPath)
{
    auto binDir = std::filesystem::weakly_canonical(std::filesystem::path(appPath)).parent_path();
    auto rootDir = std::filesystem::weakly_canonical(binDir).parent_path();
    ::rootDirectory = std::string(rootDir.c_str()) + "/";
}

const std::string triangle::fs::getRootDirectory()
{
    return ::rootDirectory;
}

namespace
{
    std::ifstream openFile(const std::string& path)
    {

        std::ifstream file(path, std::ios::in);
        if (!file)
        {
            throw std::runtime_error("triangle::assets::openFile: Cannot open file: " + path);
        }
        return file;
    }

    std::string readFile(std::ifstream file)
    {

        std::stringstream buffer;
        buffer << file.rdbuf();

        return buffer.str();
    }
} // namespace

std::string triangle::assets::loadTextFile(const std::string& path)
{
    auto file = ::openFile(path);
    return ::readFile(std::move(file));
}