#' Internal function to Catch errors and warnings
#'
#' @param expr an R expression to evaluate
#'
#' @return value a list with 'value' and 'warning', where value may be an error caught
#' @export
#'
#' @examples
#' thiserror=str( vadose.tryCatch( log( "a" ) ) )$value
vadose.tryCatch = function(expr){
W <- NULL
w.handler <- function(w){ # warning handler
W <<- w
invokeRestart("muffleWarning")
}
list(value = withCallingHandlers(tryCatch(expr, error = function(e) e),
warning = w.handler),
warning = W)
}
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