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#' Create a desktop notification
#'
#' How exactly the notification appears is platform dependent:
#' * On macOS, we use the `terminal-notifier` tool, see
#' https://github.com/julienXX/terminal-notifier
#' * On Linux and *BSD systems, including Solaris the `notify-send`
#' command line tool is used. This requires the `libnotify-bin`
#' package on Ubuntu/Debian and similar systems, or the `libnotify`
#' package on RedHat/CentOS/Fedora and similar systems.
#' * On Windows 8 or newer Windows versions we use the `toaster` tool,
#' see https://github.com/nels-o/toaster.
#' * On older Windows versions we use the `notifu` program, see
#' https://www.paralint.com/projects/notifu.
#'
#' All notification systems support showing a title and an image,
#' as part of the notification.
#'
#' @param msg Message to show. It may contain newline characters.
#' @param title Message title. Typically shown on the top, with
#' larger font.
#' @param image Image to show in the notification. By default the
#' official R logo is shown on macOS, and an alternative logo is shown
#' on other OSes, because of licensing reasons. You can specify a PNG
#' file here, to show instead of the R logo. This currently does not
#' work on older Windows versions (before Windows 8), which does not
#' allow PNG files, only ICO icons.
#'
#' @export
#' @examples
#' \dontrun{
#' notify("Hello world!")
#' notify("Hello world!", title = "Introduction")
#' notify("Hello world!", title = "Introduction", image = "mylogo.png")
#' }
notify <- function(msg, title = "R notification", image = NULL) {
stopifnot(
is.character(msg),
is.character(title), length(title) == 1,
is.null(image) || (is.character(image) && length(image) == 1)
)
msg <- paste(msg, collapse = " ")
switch(
detect_os(),
windows = notify_windows(msg, title, image),
macos = notify_macos(msg, title, image),
linux = notify_linux(msg, title, image)
)
}
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