#' Recursive (hard) dependencies of CRAN packages
#'
#' @param packages Character vector of package names.
#' @return A character vector of package names and versions,
#' separated by a single dash.
#'
#' @keywords internal
get_cran_deps <- function(packages) {
if (length(packages) == 0) {
character()
}
db <- utils::available.packages()
deps <- tools::package_dependencies(
packages,
recursive = TRUE,
which = c("Depends", "Imports", "LinkingTo"),
db = db
)
# Get rid of base packages
deps <- unique(c(packages, unlist(deps, use.names = FALSE)))
base <- rownames(utils::installed.packages(priority = "base"))
deps <- setdiff(deps, base)
deps
}
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