DataVerse file DOIs in pooch.retrieve

[dokempf]

Description of the desired feature:

In #354 we learned that DataVerse distinguishes dataset PIDs and file PIDs. Given that information, it could be discussed whether the following code should be supported:

filename = pooch.retrieve("doi:<dataverse-file-doi>")

I think it would be perfectly valid to discard this as out of scope - I just wanted to put out the question. The reasoning for out of scope would be: DOI resolution in pooch assumes a one-to-one correspondence of a pooch.Pooch instance and a data set. DOI resolution outside of this context is not supported. If on the other hand DOI resolution is extended to retrieve, this might happen for other data repositories as well, so it needs to be done proper.

Are you willing to help implement and maintain this feature?

Yes, with no specific timeline for the implementation.

[leouieda]

@dokempf I've been thinking about this and it would generate a bit of a disconnect between pooch.Pooch and pooch.retrieve since it wouldn't make sense to create a Pooch class for a repository with a single file. But if the individual file has a DOI and we keep the syntax of URLs having file names at the end, then I'd be fine with this use case. I guess it would mean putting in some checks in the Dataverse downloader, right? Is the API response for file and dataset different?