Squashed 'gitstatus/' content from commit 6b9ba17

git-subtree-dir: gitstatus
git-subtree-split: 6b9ba179c6655286c4c399e7926d5098dd6bd706

src/tag_db.h

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+// Copyright 2019 Roman Perepelitsa.
+//
+// This file is part of GitStatus.
+//
+// GitStatus is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// GitStatus is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with GitStatus. If not, see <https://www.gnu.org/licenses/>.
+
+#ifndef ROMKATV_GITSTATUS_TAG_DB_H_
+#define ROMKATV_GITSTATUS_TAG_DB_H_
+
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <git2.h>
+
+#include <condition_variable>
+#include <cstring>
+#include <mutex>
+#include <string>
+#include <vector>
+
+#include "arena.h"
+
+namespace gitstatus {
+
+struct Tag {
+  const char* name;
+  git_oid id;
+};
+
+class TagDb {
+ public:
+  explicit TagDb(git_repository* repo);
+  TagDb(TagDb&&) = delete;
+  ~TagDb();
+
+  std::string TagForCommit(const git_oid& oid);
+
+ private:
+  void ReadLooseTags();
+  void UpdatePack();
+  void ParsePack();
+  void Wait();
+
+  bool IsLooseTag(const char* name) const;
+
+  bool TagHasTarget(const char* name, const git_oid* target) const;
+
+  git_repository* const repo_;
+  git_refdb* const refdb_;
+
+  Arena pack_arena_;
+  struct stat pack_stat_ = {};
+  WithArena<std::string> pack_;
+  WithArena<std::vector<const Tag*>> name2id_;
+  WithArena<std::vector<const Tag*>> id2name_;
+
+  Arena loose_arena_;
+  std::vector<char*> loose_tags_;
+
+  std::mutex mutex_;
+  std::condition_variable cv_;
+  bool id2name_dirty_ = false;
+};
+
+}  // namespace gitstatus
+
+#endif  // ROMKATV_GITSTATUS_TAG_DB_H_