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// Copyright 2019 Roman Perepelitsa.
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//
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// This file is part of GitStatus.
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//
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// GitStatus is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// GitStatus is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
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#ifndef ROMKATV_GITSTATUS_DIR_H_
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#define ROMKATV_GITSTATUS_DIR_H_
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#include <cstddef>
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#include <vector>
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#include "arena.h"
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namespace gitstatus {
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// On error, leaves entries unchaged and returns false. Does not throw.
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//
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// On success, appends names of files from the specified directory to entries and returns true.
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// Every appended entry is a null-terminated string. At -1 offset is its d_type. All elements
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// point into the arena. They are sorted either by strcmp or strcasecmp depending on case_sensitive.
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//
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// Does not close dir_fd.
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//
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// There are two distinct implementations of ListDir -- one for Linux and another for everything
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// else. The linux-specific implementation is 20% faster.
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//
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// The reason sorting is bundled with directory listing is performance on Linux. The API of
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// getdents64 allows for much faster sorting than what can be done with a plain vector<char*>.
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// For the POSIX implementation there is no need to bundle sorting in this way. In fact, it's
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// done at the end with a generic StrSort() call.
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//
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// For best results, reuse the arena and vector for multiple calls to avoid heap allocations.
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bool ListDir(int dir_fd, Arena& arena, std::vector<char*>& entries, bool precompose_unicode,
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bool case_sensitive);
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} // namespace gitstatus
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#endif // ROMKATV_GITSTATUS_DIR_H_
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