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#' Get affiner options
#'
#' `affiner_options()` returns the `affiner` package's global options.
#'
#' @param ... `affiner` package options using `name = value`.
#' The return list will use any of these instead of the current/default values.
#' @param default If `TRUE` return the default values instead of current values.
#' @return A list of option values.
#' Note this function **does not** set option values itself but
#' this list can be passed to [options()], [withr::local_options()], or [withr::with_options()].
#' @examples
#' affiner_options()
#'
#' affiner_options(default = TRUE)
#'
#' affiner_options(affiner_angular_unit = "pi-radians")
#' @seealso [affiner] for a high-level description of relevant global options.
#' @export
affiner_options <- function(..., default = FALSE) {
afo <- list(affiner_angular_unit = "degrees",
affiner_grid_unit = "inches")
l <- list(...)
stopifnot(all(names(l) %in% names(afo)))
if (isFALSE(default)) {
for (n in names(afo)) {
afo[n] <- list(getOption(n, afo[[n]]))
}
}
if (length(names(l))) {
for (n in names(l)) {
afo[n] <- l[n]
}
}
afo
}
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