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#' Add fields for message importance and priority
#'
#' Functions to influence message delivery speed and importance.
#'
#' @name precedence
#'
#' @param msg A message object.
#' @return A message object.
NULL
#' Set message priority
#'
#' @details
#' The `priority()` function adds the `Priority` header field which gives a hint
#' to influence transmission speed and delivery. Valid values are
#' `"non-urgent"`, `"normal"`, and `"urgent"`. The non-standard `X-Priority`
#' header field is similar, for which valid values are `1` (Highest), `2`
#' (High), `3` (Normal, the default), `4` (Low), and `5` (Lowest).
#'
#' @rdname precedence
#' @param priority Priority level. One of \code{"non-urgent"}, \code{"normal"}, or \code{"urgent"}.
#'
#' @export
#'
#' @examples
#' # How rapidly does the message need to be delivered?
#' #
#' envelope() %>%
#' subject("Deliver this immediately!") %>%
#' priority("urgent")
#'
#' envelope(priority = "non-urgent") %>%
#' subject("No rush with this.")
#'
priority <- function(msg, priority = NULL) {
if (is.null(priority)) {
header_get(msg, "Priority")
} else {
if (!(priority %in% LEVELS_PRIORITY)) {
stop("Invalid priority. Options are: ", paste(LEVELS_PRIORITY, collapse = ", "), ".")
}
msg <- header_set(msg, "Priority", priority, append = FALSE)
if (get_option_invisible()) invisible(msg) else msg # nocov
}
}
#' Set message importance
#'
#' @details
#' The `importance()` function adds the `Importance` header field, which gives a
#' hint to the message recipient about how important the message is. Does not
#' influence delivery speed.
#'
#' @rdname precedence
#' @param importance Importance level. One of \code{"low"}, \code{"normal"}, or \code{"high"}.
#'
#' @export
#'
#' @examples
#' # How much attention should be paid by recipient?
#' #
#' envelope() %>%
#' subject("Read this immediately!") %>%
#' importance("high")
#'
#' envelope(importance = "low") %>%
#' subject("Not important at all. Just delete.")
importance <- function(msg, importance = NULL) {
if (is.null(importance)) {
header_get(msg, "Importance")
} else {
if (!(importance %in% LEVELS_IMPORTANCE)) {
stop("Invalid importance. Options are: ", paste(LEVELS_IMPORTANCE, collapse = ", "), ".")
}
msg <- header_set(msg, "Importance", importance, append = FALSE)
if (get_option_invisible()) invisible(msg) else msg # nocov
}
}
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