ConfigPath.h

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// SPDX-License-Identifier: LGPL-3.0-or-later
// Copyright (C) CERN for the benefit of the SHiP Collaboration
 
#pragma once
 
#include <filesystem>
#include <string>
 
namespace SHiPGeometry {
 
inline std::string resolveConfigPath(const std::string& path, const std::string& srcFallback,
                                     const std::string& installFallback) {
    namespace fs = std::filesystem;
    if (!path.empty() && path.front() == '/')
        return path;  // already absolute
    if (fs::is_regular_file(path))
        return path;  // relative to CWD
    if (!srcFallback.empty() && fs::is_regular_file(srcFallback))
        return srcFallback;
    if (!installFallback.empty() && fs::is_regular_file(installFallback))
        return installFallback;
    return path;
}
 
}  // namespace SHiPGeometry