Vectorise prep_attributes over all files in the data folder?

[annakrystalli]

Could potentially add an argument to override by extracting column names from only specified paths or excluding specified paths?

[amoeba]

Sounds good to me! Perhaps a filter argument (e.g. pattern) to be passed to dir.

[amoeba]

Cool, I just ran through the dataspice-example repo I made a while ago this worked great. I made some minor tweaks which I'm about to commit. A few notes:

• Do we want to export the pipe operator?

  export("%>%")
  

• Does this code effectively assume affiliation is a worksFor property, or can we just use https://schema.org/affiliation which is more general?

  https://github.com/ropenscilabs/dataspice/blob/7269173d3648897d1e8c585ae1b142a59ff1174a/R/write_spice.R#L25-L26