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#' .Renviron file
#'
#' Gets path to .Renviron file
#'
#' @return Returns path to .Renviron file
#' @details Checks local directory first and then checks home directory
#' @export
.Renviron <- function() {
if (file.exists(".Renviron")) {
".Renviron"
} else {
file.path(home(), ".Renviron")
}
}
#' Home directory
#'
#' Gets user's home directory
#'
#' @return Returns system/user's default home directory
#' @details Looks for "HOME" environment variable and/or normalizes the tilde
#' path
#' @export
home <- function() {
if (!identical(Sys.getenv("HOME"), "")) {
file.path(Sys.getenv("HOME"))
} else {
file.path(normalizePath("~"))
}
}
is_named <- function(x) !is.null(names(x))
are_named <- function(x) is_named(x) && !"" %in% names(x)
has_name_ <- function(x, name) isTRUE(name %in% names(x))
define_args <- function(args, ...) {
dots <- list(...)
nms <- names(dots)
for (i in nms) {
if (!has_name_(args, i)) {
args[[i]] <- dots[[i]]
}
}
args
}
append_lines <- function(x, ...) {
args <- define_args(
c(x, list(...)),
append = TRUE,
fill = TRUE
)
do.call("cat", args)
}
is_incomplete <- function(x) {
con <- file(x)
x <- tryCatch(readLines(con), warning = function(w) return(TRUE))
close(con)
ifelse(isTRUE(x), TRUE, FALSE)
}
clean_renv <- function(var) {
x <- readlines(.Renviron())
x <- grep(sprintf("^%s=", var), x, invert = TRUE, value = TRUE)
writeLines(x, .Renviron())
}
check_renv <- function(var = NULL) {
if (!file.exists(.Renviron())) return(invisible())
if (is_incomplete(.Renviron())) {
append_lines("", file = .Renviron())
}
if (!is.null(var)) {
clean_renv(var)
}
invisible()
}
#' Set R environment variable
#'
#' Sets R environment variable and adds it to user's home .Renviron file
#'
#' @param ... Named environment variables/values
#' @return Appends environment variable entry to ~/.Renviron file
#' @export
set_renv <- function(...) {
dots <- list(...)
stopifnot(are_named(dots))
vars <- names(dots)
x <- paste0(names(dots), "=", dots)
x <- paste(x, collapse = "\n")
for (var in vars) {
check_renv(var)
}
append_lines(x, file = .Renviron())
readRenviron(.Renviron())
}
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