#' @title Add or remove leading zeros
#'
#' @param x Numeric or character vector
#' @param z Number of significant digits of the resulting number with leading zeros (if NULL, it will be detected automatically)
#' @param mode "add" or "remove" leading zero
#'
#' @return vector with (mode = "add) or without (mode = "remove") leading zeros
#' @export
#'
#' @examples
#' leading_zero(1:10, z=3)
#' leading_zero(c(1,10,100,1000,10000))
#' leading_zero(c("001", "1001", "g01", "0abc"), mode = "remove")
#'
leading_zero <- function(x, z = NULL, mode = "add"){
## Add leading zeros
if(mode == "add"){
if(is.null(z)){
## Find the number of characters
z <- nchar(as.integer(max(x)))
}
zz <- paste("%0", z, "d", sep = "")
res <- sprintf(zz, x)
}
## Remove leading zeros
if(mode == "remove"){
res <- gsub("(^|[^0-9])0+", "\\1", x, perl = TRUE)
}
return(res)
}
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