>>>>> Lluís Revilla writes: Lluis,
So in available.packages() I could replace if (is.null(fields)) fields <- requiredFields else { stopifnot(is.character(fields)) fields <- unique(c(requiredFields, fields)) } by someting like if(is.null(fields)) fields <- getOption("available_packages_fields") if(is.null(fields)) fields <- requiredFields else { stopifnot(is.character(fields)) fields <- unique(c(requiredFields, fields)) } ? Best -k > Hi all, > I have recently been researching how available.packages and > install.packages filter packages from repositories with additional fields > in their PACKAGES file. > Currently there are some default filters, but users (and R admins) can set > up their own filters by passing a list to the fields argument or adding > them to the "available_packages_filters" option. > But if the fields used by the filters are not read by default, then users > must manually add the required fields to each call to available.packages. > This makes it difficult to use new fields and to control what is installed > in highly regulated systems which want to use more fields to select what is > installed. > Current workarounds considered are: > 1) The filtering function requiring new fields intercepts the call to > available.packages and adds the desired fields via eval in > parent.environment and then adds the filters again. > 2) Import new data (remote or local) when filtering packages, merge them > and filter accordingly. > 3) Suggestions? > The first solution is complicated, while the second doesn't use the R > machinery of tools::write_PACKAGES to set up the repository with all the > fields (although how to add more fields to the repository file is a > different issue). > Would it be possible to add a new option to add fields to be read by > available.packages, similar to filters? > The same approach for fields as for filters would avoid the two workarounds > mentioned. To match it, the new option could be named > "available_packages_fields". > I look forward to hearing from you, > Lluís > [[alternative HTML version deleted]] > ______________________________________________ > R-devel@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-devel ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel