R 패키지 다운로드

instPkgPlusDeps.R

instPkgPlusDeps <- function(pkg, download = TRUE,
                            which = c("Depends", "Imports", "LinkingTo"),
                            inc.pkg = TRUE) {
  stopifnot(require("tools")) ## load tools
  ap <- available.packages() ## takes a minute on first use
  ## get dependencies for pkg recursively through all dependencies
  deps <- package_dependencies(pkg, db = ap, which = which, recursive = TRUE)
  ## the next line can generate warnings; I think these are harmless
  ## returns the Priority field. `NA` indicates not Base or Recommended
  pri <- sapply(deps[[1]], packageDescription, fields = "Priority")
  ## filter out Base & Recommended pkgs - we want the `NA` entries
  deps <- deps[[1]][is.na(pri)]
  ## install pkg too?
  if (inc.pkg) {
    deps = c(pkg, deps)
  }
  ## are we downloading?
  if (download) {
    download.packages(deps, destdir = '~/rpackage', type = 'source')
  }
  deps ## return dependencies
}