Restore support for task info journal (#3671)

This support was removed before Taskwarrior-3.x, and is now restored,
including the original tests removed in
ddd367232e

src/Operation.h

@@ -0,0 +1,88 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// Copyright 2006 - 2024, Tomas Babej, Paul Beckingham, Federico Hernandez.
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// The above copyright notice and this permission notice shall be included
+// in all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
+// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+// SOFTWARE.
+//
+// https://www.opensource.org/licenses/mit-license.php
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#ifndef INCLUDED_OPERATIOn
+#define INCLUDED_OPERATIOn
+
+#include <taskchampion-cpp/lib.h>
+
+#include <optional>
+#include <vector>
+
+// Representation of a TaskChampion operation.
+//
+// This class wraps `tc::Operation&` and thus cannot outlive that underlying
+// type.
+class Operation {
+ public:
+  explicit Operation(const tc::Operation &);
+
+  Operation(const Operation &other) = default;
+  Operation &operator=(const Operation &other);
+
+  // Create a vector of Operations given the result of `Replica::get_undo_operations` or
+  // `Replica::get_task_operations`. The resulting vector must not outlive the input `rust::Vec`.
+  static std::vector<Operation> operations(const rust::Vec<tc::Operation> &);
+
+  // Methods from the underlying `tc::Operation`.
+  bool is_create() const { return op->is_create(); }
+  bool is_update() const { return op->is_update(); }
+  bool is_delete() const { return op->is_delete(); }
+  bool is_undo_point() const { return op->is_undo_point(); }
+  std::string get_uuid() const { return std::string(op->get_uuid().to_string()); }
+  ::rust::Vec<::tc::PropValuePair> get_old_task() const { return op->get_old_task(); };
+  std::string get_property() const {
+    std::string value;
+    op->get_property(value);
+    return value;
+  }
+  std::optional<std::string> get_value() const {
+    std::optional<std::string> value{std::string()};
+    if (!op->get_value(value.value())) {
+      value = std::nullopt;
+    }
+    return value;
+  }
+  std::optional<std::string> get_old_value() const {
+    std::optional<std::string> old_value{std::string()};
+    if (!op->get_old_value(old_value.value())) {
+      old_value = std::nullopt;
+    }
+    return old_value;
+  }
+  time_t get_timestamp() const { return static_cast<time_t>(op->get_timestamp()); }
+
+  // Define a partial order on Operations:
+  //  - Create < Update < Delete < UndoPoint
+  //  - Given two updates, sort by timestamp
+  bool operator<(Operation &other) const;
+
+ private:
+  const tc::Operation *op;
+};
+
+#endif
+////////////////////////////////////////////////////////////////////////////////