#' Package dependencies
#'
#' @export
#' @note Updated 2022-10-20.
#'
#' @param pkg `character(1)`.
#' Package name.
#'
#' @param recursive `logical(1)`.
#' Check dependencies recursively.
#'
#' @return `character`.
#' Names of dependency packages.
#'
#' @examples
#' ## > packageDependencies("stats")
packageDependencies <- function(pkg, recursive = TRUE) {
stopifnot(
.requireNamespaces(c("BiocManager", "tools", "withr")),
.isString(pkg),
.isFlag(recursive)
)
withr::with_options(
new = list(
"repos" = append(
x = getOption("repos"),
values = BiocManager::repositories()
)
),
code = {
out <- tools::package_dependencies(
packages = pkg,
db = NULL,
which = c("Depends", "Imports", "LinkingTo"),
recursive = recursive,
reverse = FALSE
)
out <- out[[1L]]
out
}
)
}
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