rapport class: add "call" or "src" of called command about rapport HOT 4 CLOSED

This is a nice one indeed. However, you can't get reproducible example unless you also store the data with rapport object. Just think about it, as it's not a bugger for me to implement it, but it will certainly add some extra weight.

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Thanks @aL3xa, you are right.
Please implement it with data list element added also - but with an option within rapport to add data to the returned rapport class default set to TRUE.

So suggested return value:

res <- list(
        metadata = meta,
        inputs = inputs,
        call = match.call(),
        data = data, ## check this out as I'm not sure
        report = report
        )

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Yes, but I see one limitation here. If you aim at creating reproducible example, maybe we shouldn't save the contents of data arguments per se, but only the provided value. Furthermore, there should be an optional argument to save inputs, in order to reproduce examples, but that should be somehow related to tpl.examples function that we have implemented. It's not that hi-priority task, IMO, but we should think about it, that's for sure.

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Based on the above suggested structure of return value: all inputs are saved with match.call() to call and if the whole dataset is attached (with data), then it's totally reproducible IMHO. The downside is that it's having some overhead (saving not needed variables too), but we can live with that :)

Might improve it later, but for the moment, that would be cool.

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