Function locateFile

samples/common/common.h:211–268

Locate path to file, given its filename or filepath suffix and possible dirs it might lie in. Function will also walk back MAX_DEPTH dirs from CWD to check for such a file path.

//! Locate path to file, given its filename or filepath suffix and possible dirs it might lie in.
//! Function will also walk back MAX_DEPTH dirs from CWD to check for such a file path.
inline std::string locateFile(
    const std::string& filepathSuffix, const std::vector<std::string>& directories, bool reportError = true)
{
    const int MAX_DEPTH{10};
    bool found{false};
    std::string filepath;

    for (auto& dir : directories)
    {
        if (!dir.empty() && dir.back() != '/')
        {
#ifdef _MSC_VER
            filepath = dir + "\\" + filepathSuffix;
#else
            filepath = dir + "/" + filepathSuffix;
#endif
        }
        else
        {
            filepath = dir + filepathSuffix;
        }

        for (int i = 0; i < MAX_DEPTH && !found; i++)
        {
            const std::ifstream checkFile(filepath);
            found = checkFile.is_open();
            if (found)
            {
                break;
            }

            filepath = "../" + filepath; // Try again in parent dir
        }

        if (found)
        {
            break;
        }

        filepath.clear();
    }

    // Could not find the file
    if (filepath.empty())
    {
        const std::string dirList = std::accumulate(directories.begin() + 1, directories.end(), directories.front(),
            [](const std::string& a, const std::string& b) { return a + "\n\t" + b; });
        std::cout << "Could not find " << filepathSuffix << " in data directories:\n\t" << dirList << std::endl;

        if (reportError)
        {
            std::cout << "&&&& FAILED" << std::endl;
            exit(EXIT_FAILURE);
        }
    }

    return filepath;
}