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# !diagnostics off
#' @title Backport of R_user_dir for R < 4.0.0
#'
#' @description
#' See the original description in \code{tools::R_user_dir}.
#'
#' @keywords internal
#' @examples
#' \dontrun{
#' # get function from namespace instead of possibly getting
#' # implementation shipped with recent R versions:
#' f = getFromNamespace("R_user_dir", "icd")
#' cached <- f("icd", "cache")
#' confd <- f("icd", "config")
#' datad <- f("icd", "data")
#' dir.exists(c(cached, confd, datad))
#' prnts <- vapply(c(cached, confd, datad), dirname, character(1))
#' dir.exists(prnts)
#' p_prt <- vapply(prnts, dirname, character(1))
#' dir.exists(p_prt)
#' q_prt <- vapply(p_prt, dirname, character(1))
#' dir.exists(q_prt)
#' r_prt <- vapply(q_prt, dirname, character(1))
#' dir.exists(r_prt)
#' vapply(list(prnts, p_prt, q_prt, r_prt), `[[`, FUN.VALUE = character(1), 1)
#' }
#' @author Michael Lang, adapted by Jack Wasey
#' @keywords internal
#' @noRd
R_user_dir <- function(package = "icd", which = c("data", "config", "cache")) {
stopifnot(is.character(package), length(package) == 1L)
which <- match.arg(which)
home <- normalizePath("~")
path <-
switch(which,
data = {
if(nzchar(p <- Sys.getenv("R_USER_DATA_DIR")))
p
else if(nzchar(p <- Sys.getenv("XDG_DATA_HOME")))
p
else if(.Platform$OS.type == "windows")
file.path(Sys.getenv("APPDATA"), "R", "data")
else if(Sys.info()["sysname"] == "Darwin")
file.path(home, "Library", "Application Support",
"org.R-project.R")
else
file.path(home, ".local", "share")
},
config = {
if(nzchar(p <- Sys.getenv("R_USER_CONFIG_DIR")))
p
else if(nzchar(p <- Sys.getenv("XDG_CONFIG_HOME")))
p
else if(.Platform$OS.type == "windows")
file.path(Sys.getenv("APPDATA"), "R", "config")
else if(Sys.info()["sysname"] == "Darwin")
file.path(home, "Library", "Preferences",
"org.R-project.R")
else
file.path(home, ".config")
},
cache = {
if(nzchar(p <- Sys.getenv("R_USER_CACHE_DIR")))
p
else if(nzchar(p <- Sys.getenv("XDG_CACHE_HOME")))
p
else if(.Platform$OS.type == "windows")
file.path(Sys.getenv("LOCALAPPDATA"), "R", "cache")
else if(Sys.info()["sysname"] == "Darwin")
file.path(home, "Library", "Caches",
"org.R-project.R")
else
file.path(home, ".cache")
})
file.path(path, "R", package)
}
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