Code

render_rmarkdown <- function(pkg, input, output, ..., copy_images = TRUE, quiet = TRUE) {
  input_path <- path_abs(input, pkg$src_path)
  output_path <- path_abs(output, pkg$dst_path)

  if (!file_exists(input_path)) {
    stop("Can't find ", src_path(input), call. = FALSE)
  }

  cat_line("Reading ", src_path(input))
  digest <- file_digest(output_path)

  args <- list(
    input = input_path,
    output_file = path_file(output_path),
    output_dir = path_dir(output_path),
    intermediates_dir = tempdir(),
    encoding = "UTF-8",
    envir = globalenv(),
    ...,
    quiet = quiet
  )

  path <- tryCatch(
    rmarkdown::r_safe(
      function(...) rmarkdown::render(...),
      args = args,
      show = !quiet,
      env = c(
        rmarkdown::rcmd_safe_env(),
        BSTINPUTS = bst_paths(input_path),
        TEXINPUTS = tex_paths(input_path),
        BIBINPUTS = bib_paths(input_path),
        R_CLI_NUM_COLORS = 256
      )
    ),
    error = function(cnd) {
      rule("RMarkdown error")
      cat(gsub("\r", "", cnd$stderr, fixed = TRUE))
      rule()
      abort("Failed to render RMarkdown", parent = cnd)
    }
  )

  if (identical(path_ext(path)[[1]], "html")) {
    update_html(
      path,
      tweak_rmarkdown_html,
      input_path = path_dir(input_path),
      pkg = pkg
    )
  }
  if (digest != file_digest(output_path)) {
    cat_line("Writing ", dst_path(output))
  }

  # Copy over images needed by the document
  if (copy_images) {
    ext <- rmarkdown::find_external_resources(input_path)

    # copy web + explicit files beneath vignettes/
    is_child <- path_has_parent(ext$path, ".")
    ext_path <- ext$path[(ext$web | ext$explicit) & is_child]

    src <- path(path_dir(input_path), ext_path)
    dst <- path(path_dir(output_path), ext_path)
    # Make sure destination paths exist before copying files there
    dir_create(unique(path_dir(dst)))
    file_copy(src, dst, overwrite = TRUE)
  }
  check_missing_images(pkg, input, output)

  invisible(path)
}