#' Print available variation operators
#'
#' Prints the variation operators available in the MOEADr package
#'
#' This routine prints the names of the variation operators available in
#' the MOEADr package, to be used as the \code{variation$name} parameter in the
#' \code{moead(...)} call. Instructions for obtaining more info on each
#' operator are also returned.
#'
#' @return Formatted data frame containing reference name (for
#' \code{variation$name}) and instructions for More Info about each operator.
#'
#' @examples
#' get_variation_operators()
#'
#' @export
get_variation_operators <- function(){
# Get only functions with "variation_" in the name (except for
# "get_variation_operators"
var.list <- ls("package:MOEADr")
var.list <- var.list[grep(pattern = "variation_", var.list)]
var.list <- var.list[-which(var.list == "get_variation_operators")]
var.list.name <- gsub("variation_", "", var.list)
output <- data.frame(name = var.list.name,
`More Info` = paste0("'?", var.list, "'"))
name.width <- max(sapply(as.character(output$More.Info), nchar))
names(output) <- format(names(output),
width = name.width,
justify = "centre")
format(output, width = name.width, justify = "centre")
}
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