Nothing
renv_task_create <- function(callback, name = NULL) {
# create name for task callback
name <- name %||% as.character(substitute(callback))
name <- paste("renv", name, sep = ":::")
# remove an already-existing task of the same name
removeTaskCallback(name)
# otherwise, add our new task
addTaskCallback(
renv_task_callback(callback, name),
name = name
)
}
renv_task_callback <- function(callback, name) {
force(callback)
force(name)
function(...) {
status <- tryCatch(callback(), error = identity)
if (inherits(status, "error")) {
caution("Error in background task '%s': %s", name, conditionMessage(status))
caution("Background task '%s' will be stopped.", name)
return(FALSE)
}
TRUE
}
}
renv_task_unload <- function() {
callbacks <- getTaskCallbackNames()
for (callback in callbacks)
for (prefix in c("renv_", "renv:::"))
if (startswith(callback, prefix))
removeTaskCallback(callback)
}
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