Tools to Work with the 'Splash' JavaScript Rendering Service in R
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#' Return the HTML or image (png) of the javascript-rendered page in a local file
#' The suggested use-case for this is rendering a widget
#' TODO Test if container is running
#' TODO Enable passing in of an htmlwidget and use saveWidget
#' @md
#' @param splash_obj Object created by a call to [splash]()
#' @param file_path Absolute path to a filename on the local host. **This only works with a locally running Splash instance started with [start_splash]().**
#' @param output either `html` or `png` to get the page content or an image capture
#' @param viewport View width and height (in pixels) of the browser viewport to render the web page. Format is "`<width>x<height>`". e.g. 800x600. Default value is 1024x768.
#' @param ... other params to [render_html]() or [render_png]()
#' @return An XML document or `magick` object
#' @export
render_file <- function(splash_obj = slpash_local, file_path, output=c("html", "png"), wait=0, viewport="1024x768", ...) {
output <- match.arg(output, c("html", "png"))
file.copy(file_path, .pkgenv$temp_dir)
fil <- basename(file_path)
URL <- sprintf("http://localhost:9999/%s", fil)
if (output == "html") {
render_html(splash_obj, URL, wait=wait, viewport=viewport, ...)
} else {
render_png(splash_obj, URL, wait=wait, viewport=viewport, ...)