Checks for valid members of subdirectory

Source: R/macros.R

Not meant to be called directly

.check_valid_util(util, utils = NULL, path = NULL)

Arguments

util

name of target located in path
utils

name of supported targets in path
path

path to directory

Value

safe path to util, or error if util does not exist

Examples

if (.Platform$OS.type == "unix") {
# this will return /full/path/to/bin
# or return an error for all values of util that are not "ls" and "pwd"
# or error if "ls" does not exist in "/bin"
.check_valid_util("ls", utils = c("ls", "pwd"), "/bin")

if (FALSE) {
# This will throw error
.check_valid_util("badUtil", utils = c("ls", "pwd"), "/bin")
}
}