Support for ecflow-generated variables

[corentincarton]

Is your feature request related to a problem? Please describe.

We can't use ecflow-generated variables in scripts as they are not supported by pyflow, which means they are not detected and exported at the beginning of the script. For instance, if I create a RepeatDate("YMD",...), ecflow will generate the following variables:

• YMD
• YMD_DD
• YMD_DOW
• YMD_JULIAN
• YMD_MM
• YMD_YYYY But we can't use those because they are not added to the exportables list in pyflow (see https://github.com/ecmwf/pyflow/blob/master/pyflow/attributes.py#L259 and https://github.com/ecmwf/pyflow/blob/master/pyflow/nodes.py#L401). The RepeatDate class is only linked to one exported variable, following the name provided in the RepeatDate class. The FAMILY variable, attached to a Family node is another example, but there are many others. We should list them.

Describe the solution you'd like

We could maybe add a list of exportables attached to an Exportable class?

Describe alternatives you've considered

No response

Additional context

No response

Organisation

No response

[corentincarton]

List of ECFLOW generated variables (missing repeat and maybe other attributes): https://ecflow.readthedocs.io/en/latest/ug/user_manual/ecflow_variables/generated_variables.html