FileIO integration

[gdkrmr]

Does it make sense to integrate this package with FileIO?

This way you can do

save("mycube.zarr", mycube)

• Can FileIO handle directories?
• Should the be done here or in Zarr.jl?
• I think this would also allow a much more general version of @loadOrGenerate https://github.com/JuliaIO/FileIO.jl/issues/359

[meggart]

I agree it would be great to do this. I once looked into this and it looks like this is difficult for directories since you can not read magic bytes from a directory.

Regarding the loadorgenerate macro, I would be happy to remove it from YAXArrays, because the functionality is in no way specific to YAXArrays. I would be happy if this became a small package as you suggested in the FileIO issue, so we don't have to maintain it here.

[gdkrmr]

magic can be a function that returns a Bool [1] so I guess this should be fine. Not sure if FileIO can work on directories.

• A zarray is defined by the JSON file .zarray that contains the `"zarr_format: 2" key, correct?
• A collection of zarrays is defined by a .zgroup file that contains the same key, correct?

Does the magic function have to check for anything else?

Question:

• What should load these files? Zarr.jl or YAXArrays.jl?
• Can YAXArrays.jl just load any .zgroup? If not we have to load everything using Zarr.jl.

[1] https://juliaio.github.io/FileIO.jl/stable/registering/