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+/**
+ * Copyright (c) 2013, Timothy Stack
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this
+ * list of conditions and the following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice,
+ * this list of conditions and the following disclaimer in the documentation
+ * and/or other materials provided with the distribution.
+ * * Neither the name of Timothy Stack nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ''AS IS'' AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * @file session_data.hh
+ */
+
+#ifndef lnav_session_data_hh
+#define lnav_session_data_hh
+
+#include <map>
+#include <set>
+#include <string>
+#include <vector>
+
+#include "mapbox/variant.hpp"
+#include "optional.hpp"
+#include "view_helpers.hh"
+
+struct file_state {
+    bool fs_is_visible{true};
+};
+
+struct view_state {
+    int64_t vs_top{0};
+    nonstd::optional<int64_t> vs_selection;
+};
+
+struct session_data_t {
+    uint64_t sd_save_time{0};
+    bool sd_time_offset{false};
+    std::map<std::string, file_state> sd_file_states;
+    std::set<std::string> sd_recent_netlocs;
+    view_state sd_view_states[LNV__MAX];
+};
+
+extern struct session_data_t session_data;
+
+void init_session();
+void load_session();
+void load_time_bookmarks();
+void save_session();
+void reset_session();
+
+namespace lnav {
+namespace session {
+namespace regex101 {
+
+struct entry {
+    std::string re_format_name;
+    std::string re_regex_name;
+    std::string re_permalink;
+    std::string re_delete_code;
+};
+
+void insert_entry(const entry& ei);
+
+struct no_entry {};
+
+struct error {
+    std::string e_msg;
+};
+
+using get_result_t = mapbox::util::variant<entry, no_entry, error>;
+
+get_result_t get_entry(const std::string& format_name,
+                       const std::string& regex_name);
+void delete_entry(const std::string& format_name,
+                  const std::string& regex_name);
+Result<std::vector<entry>, std::string> get_entries();
+
+}  // namespace regex101
+}  // namespace session
+}  // namespace lnav
+
+#endif