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.cpp

@@ -0,0 +1,73 @@
+////////////////////////////////////////////////////////////////////////////////
+//
+// 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
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <cmake.h>
+// cmake.h include header must come first
+
+#include <Operation.h>
+#include <taskchampion-cpp/lib.h>
+
+#include <vector>
+
+////////////////////////////////////////////////////////////////////////////////
+Operation::Operation(const tc::Operation& op) : op(&op) {}
+
+////////////////////////////////////////////////////////////////////////////////
+std::vector<Operation> Operation::operations(const rust::Vec<tc::Operation>& operations) {
+  return {operations.begin(), operations.end()};
+}
+
+////////////////////////////////////////////////////////////////////////////////
+Operation& Operation::operator=(const Operation& other) {
+  op = other.op;
+  return *this;
+}
+
+////////////////////////////////////////////////////////////////////////////////
+bool Operation::operator<(Operation& other) const {
+  if (is_create()) {
+    return !other.is_create();
+  } else if (is_update()) {
+    if (other.is_create()) {
+      return false;
+    } else if (other.is_update()) {
+      return get_timestamp() < other.get_timestamp();
+    } else {
+      return true;
+    }
+  } else if (is_delete()) {
+    if (other.is_create() || other.is_update() || other.is_delete()) {
+      return false;
+    } else {
+      return true;
+    }
+  } else if (is_undo_point()) {
+    return !other.is_undo_point();
+  }
+  return false;  // not reachable
+}
+
+////////////////////////////////////////////////////////////////////////////////