Method formatForInfo

src/commands/CmdInfo.cpp:582–685

///////////////////////////////////////////////////////////////////////////

////////////////////////////////////////////////////////////////////////////////
std::optional<std::string> CmdInfo::formatForInfo(const std::vector<Operation>& operations,
                                                  size_t group_start, size_t group_end,
                                                  const std::string& dateformat, long& last_start) {
  std::stringstream out;
  for (auto i = group_start; i < group_end; i++) {
    auto& operation = operations[i];
    assert(operation.is_update());

    // Extract the parts of the Update operation.
    std::string prop = operation.get_property();
    std::optional<std::string> value = operation.get_value();
    std::optional<std::string> old_value = operation.get_old_value();
    Datetime timestamp(operation.get_timestamp());

    // Never care about modifying the modification time, or the legacy properties `depends` and
    // `tags`.
    if (prop == "modified" || prop == "depends" || prop == "tags") {
      continue;
    }

    // Handle property deletions
    if (!value && old_value) {
      if (Task::isAnnotationAttr(prop)) {
        out << format("Annotation '{1}' deleted.\n", *old_value);
      } else if (Task::isTagAttr(prop)) {
        out << format("Tag '{1}' deleted.\n", Task::attr2Tag(prop));
      } else if (Task::isDepAttr(prop)) {
        out << format("Dependency on '{1}' deleted.\n", Task::attr2Dep(prop));
      } else if (prop == "start") {
        Datetime started(last_start);
        Datetime stopped = timestamp;

        // If any update in this group sets the `end` property, use that instead of the
        // timestamp deleting the `start` property as the stop time.
        // See https://github.com/GothenburgBitFactory/taskwarrior/issues/2514
        for (auto i = group_start; i < group_end; i++) {
          auto& op = operations[i];
          assert(op.is_update());
          if (op.get_property() == "end") {
            try {
              stopped = op.get_value().value();
            } catch (std::string) {
              // Fall back to the 'start' timestamp if its value is un-parseable.
              stopped = op.get_timestamp();
            }
          }
        }

        out << format("{1} deleted (duration: {2}).", Lexer::ucFirst(prop),
                      Duration(stopped - started).format())
            << "\n";
      } else {
        out << format("{1} deleted.\n", Lexer::ucFirst(prop));
      }
    }

    // Handle property additions.
    if (value && !old_value) {