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#ifndef TEMPLAT_UTIL_LOG_STRIPPATHFROMFILENAME_H
#define TEMPLAT_UTIL_LOG_STRIPPATHFROMFILENAME_H

/* This file is part of TempLat, available at https://cosmolattice.github.io/templat .
   Copyright 2021-2026 The TempLat authors, see AUTHORS.md.
   Released under the MIT license, see LICENSE.md. */

// File info: Main contributor(s): Wessel Valkenburg, Year: 2019

#include <stdexcept>

#include "TempLat/util/log/trailingzerochar.h"
#include "TempLat/util/tdd/tddmacros.h"

namespace TempLat
{

  /* constexpr functions and constexpr constructors are implicitly inline */
  /* inline */
  constexpr const char *StripPathFromFileName(const char *name) noexcept
  {
    /* a hack https://www.youtube.com/watch?v=fZjYCQ8dzTc&feature=youtu.be&t=3679 putting an unresolved symbol in an
     * exception that is never thrown: this guarantees that this function is truly only evaluated at compiler time, or
     * else an error is raise. */
    /* and https://stackoverflow.com/questions/32401256/how-can-i-do-a-runtime-assert-in-a-constexpr-function */
    constexpr const char *unresolved_char_symbol = NULL;
    const char *result = name;
    for (const char *i = name, *i_end = TrailingZeroChar(name); i < i_end; ++i) {
      if (*i == '/' && i + 1 < i_end) result = i + 1;
    }
    return true ? result : throw std::runtime_error(unresolved_char_symbol);
  }

} // namespace TempLat

#endif