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+/**
+ * Copyright (c) 2022, 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.
+ */
+
+#ifndef regex101_client_hh
+#define regex101_client_hh
+
+#include <string>
+#include <vector>
+
+#include "base/lnav.console.hh"
+#include "base/result.h"
+#include "mapbox/variant.hpp"
+
+namespace regex101 {
+namespace client {
+
+struct unit_test {
+    enum class criteria {
+        DOES_MATCH,
+        DOES_NOT_MATCH,
+    };
+
+    std::string ut_description;
+    std::string ut_test_string;
+    std::string ut_target{"REGEX"};
+    criteria ut_criteria{criteria::DOES_MATCH};
+
+    bool operator==(const unit_test& rhs) const;
+    bool operator!=(const unit_test& rhs) const;
+};
+
+struct entry {
+    std::string e_regex;
+    std::string e_test_string;
+    std::string e_flags{"gs"};
+    std::string e_delimiter{"/"};
+    std::string e_flavor{"pcre"};
+    std::vector<unit_test> e_unit_tests;
+    nonstd::optional<std::string> e_permalink_fragment;
+
+    bool operator==(const entry& rhs) const;
+    bool operator!=(const entry& rhs) const;
+};
+
+struct upsert_response {
+    std::string cr_delete_code;
+    std::string cr_permalink_fragment;
+    int32_t cr_version;
+};
+
+Result<upsert_response, lnav::console::user_message> upsert(entry& en);
+
+struct no_entry {};
+
+using retrieve_result_t
+    = mapbox::util::variant<entry, no_entry, lnav::console::user_message>;
+
+retrieve_result_t retrieve(const std::string& permalink);
+
+Result<void, lnav::console::user_message> delete_entry(
+    const std::string& delete_code);
+
+std::string to_edit_url(const std::string& permalink);
+
+}  // namespace client
+}  // namespace regex101
+
+#endif