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# To reset search path by detaching missing paths:
#' Reset search path of current R session
#'
#' This function is used to detach packages that have been added by a student
#' script.
#'
#' @param old_path A character vector of package namespaces. This is usually
#' the output of \code{\link[base]{search}}, run before an R script or Rmd
#' file is rendered, which could cause the search path to change.
#'
#' @return There is no object returned. This function is called for it's side-
#' effect of altering the search path.
#'
#' @details When a student script is rendered using \code{\link{render_one}},
#' new packages might be added to the search path. These may conflict with the
#' instructors' search path order, or with subsequent runs of
#' \code{\link{render_one}} on students. Hence there is a need to reset the
#' search path before this is done.
#'
#' This function does not unload namespaces. It only detaches them from the
#' search path. For a difference between the two, please see Hadley's page.
#'
#' @export
#' @examples
#' opath <- search()
#' # Load a package
#' reset_path(opath)
reset_path <- function(old_path) {
cur_search_path <- search()
path_mods <- setdiff(cur_search_path, old_path)
while(length(path_mods) > 0) {
id <- which(cur_search_path == path_mods[1])
detach(pos=id[1])
cur_search_path <- search()
path_mods <- setdiff(cur_search_path, old_path)
}
return(invisible(1L))
}
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