R/ds_helpers.R

In bernhard-da/datastore: Creates a datastore which can contain versioned datasets

## helpers
ds_isvalid <- function(ds) {
  stopifnot(is_scalar_character(ds))
  finfo <- ds_infofile(ds)
  if (file.exists(finfo)) {
    res <- fromJSON(finfo)
    stopifnot(is.list(res), length(res) == 6)
    stopifnot(names(res) == c("ds_name", "created_at", "datastore_path", "last_indexed", "datasets", "info"))

    if (!is.na(res$info) && length(list.files(ds_filepath(ds))) != nrow(res$info)) {
      # recreate (perhaps files have been manually deleted)
      ds_update_index(ds, verbose = FALSE)
    }
  }
  return(invisible(TRUE))
}

ds_infofile <- function(ds) {
  file.path(ds, "datastore", "DATASTORE")
}

ds_filepath <- function(ds) {
  file.path(ds, "datastore", "files")
}

ds_timestamp <- function() {
  format(Sys.time(), "%Y%m%d_%H%M")
}

ds_sep <- function() {
 "_-__-_"
}