Downloading data from web should be cached

[lshep]

If a package is downloading data from the web it should be cached using BiocFileCache

[lcolladotor]

Hm.... I think this one is really tricky.

I can see the value in caching, which I appreciate and I should probably do it more in a few of my packages. Now, in some cases, I download the data to a specific directory in a specific structure, so I would need to learn how to copy the data from the BiocFileCache to the location I want it in.

Also, what happens when you are accessing say BigWig files from the web? The idea is to just access a small chunk of the file on the web so you don't have to download the whole thing. I'm assuming that would still be ok.

[lshep]

Downloading data to a users system in a specific location is never really recommended because you never know what RW ability a user will have. We use default caching location of a users system that should be writable.

Depending on the download link I think it should be possible. There is also the ability in BiocFileCache to do processing on a downloaded file and save the result rather than the raw file itself.