file_system_error.h

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#pragma once
 
#include <string>
#include <utility>
 
#include <rex/result.h>
#include <rex/types.h>
 
namespace rex::filesystem {

enum class FileSystemError : u8 {
  kNone = 0,
  kNotFound,     
  kPathNotFound, 
  kExists,
  kIsDirectory,
  kNotDirectory,
  kAccessDenied,
  kEndOfFile, 
  kUnsupported,
  kNoMount,
  kMountExists,
  kInvalidPath, 
  kCorrupt,
  kIO,
  kSharingViolation, 
  kNotSameDevice,    
};

[[nodiscard]] inline rex::Error BuildError(FileSystemError code, std::string message) {
  ErrorCategory category = ErrorCategory::kIO;
  switch (code) {
    case FileSystemError::kNotFound:
    case FileSystemError::kPathNotFound:
    case FileSystemError::kNoMount:
      category = ErrorCategory::kNotFound;
      break;
    case FileSystemError::kCorrupt:
      category = ErrorCategory::kFormat;
      break;
    case FileSystemError::kUnsupported:
      category = ErrorCategory::kNotImplemented;
      break;
    default:
      break;
  }
  return {category, std::move(message), static_cast<int>(code)};
}
 
[[nodiscard]] inline FileSystemError CodeOf(const rex::Error& error) {
  return static_cast<FileSystemError>(error.code);
}
 
}  // namespace rex::filesystem