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#' Print the table on an isolated landscape page in PDF
#'
#' @description This function will put the table on an single landscape page.
#' It's useful for wide tables that can't be printed on a portrait page.
#'
#' @param kable_input Output of `knitr::kable()` with `format` specified
#' @param margin Customizable page margin for special needs. Values can be
#' "1cm", "1in" or similar.
#'
#' @examples
#' \dontrun{
#' landscape(knitr::kable(head(mtcars), "latex"))
#' }
#'
#' @export
landscape <- function(kable_input, margin = NULL) {
kable_format <- attr(kable_input, "format")
if (kable_format %in% c("pipe", "markdown")) {
kable_input <- md_table_parser(kable_input)
kable_format <- attr(kable_input, "format")
}
if (!kable_format %in% c("html", "latex")) {
warning("Please specify format in kable. kableExtra can customize either ",
"HTML or LaTeX outputs. See https://haozhu233.github.io/kableExtra/ ",
"for details.")
return(kable_input)
}
if (kable_format == "html") {
return(kable_input)
}
if (kable_format == "latex") {
return(landscape_latex(kable_input, margin))
}
}
landscape_latex <- function(kable_input, margin) {
kable_attrs <- attributes(kable_input)
out <- paste0(
"\n\\begin{landscape}",
solve_enc(kable_input),
"\n\\end{landscape}"
)
if (!is.null(margin)) {
out <- paste0(
"\n\\newgeometry{margin=", margin, "}", out, "\n\\restoregeometry"
)
}
out <- structure(out, format = "latex", class = "knitr_kable")
attributes(out) <- kable_attrs
attr(out, "landscape") <- TRUE
return(out)
}
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