listfile.hpp

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#pragma once

 
#include <concepts>
#include <optional>
#include <string>
#include <string_view>
 
#include <wowlib/core/error.hpp>
#include <wowlib/core/file_key.hpp>
 
namespace wowlib::fs {
  template <typename L> concept ListfileProvider = requires(L l, const L cl, std::string_view path, FileDataID id) {
    { cl.pathToFdid(path) } -> std::same_as<std::optional<FileDataID>>; {
      cl.fdidToPath(id)
    } -> std::same_as<std::optional<std::string>>; { l.registerPath(path) } -> std::same_as<Result<FileDataID>>; {
      cl.contains(path)
    } -> std::same_as<bool>;
  };

  struct NullListfile {
    std::optional<FileDataID> pathToFdid(std::string_view) const {
      return std::nullopt;
    }

    std::optional<std::string> fdidToPath(FileDataID) const {
      return std::nullopt;
    }

    Result<FileDataID> registerPath(std::string_view) {
      return makeError(ErrorCode::NotSupported,
                        "NullListfile cannot register paths; this client has no " "FileDataID space");
    }

    bool contains(std::string_view) const { return false; }
  };
 
  static_assert(ListfileProvider<NullListfile>);
}