fix: improve error checking for plot hook

- check image is not an url
- mention in the manual

fix #146

DESCRIPTION

@@ -1,7 +1,7 @@
 Package: officedown
 Type: Package
 Title: Enhanced 'R Markdown' Format for 'Word' and 'PowerPoint'
-Version: 0.4.0.002
+Version: 0.4.0.003
 Authors@R: c(
     person("David", "Gohel", role = c("aut", "cre", "cph"),
     email = "[email protected]"),
@@ -26,13 +26,13 @@ License: MIT + file LICENSE
 Encoding: UTF-8
 Imports: knitr, 
  rmarkdown, 
- officer (>= 0.5.1), 
+ officer (>= 0.6.7), 
  xml2, rlang, uuid,
  grDevices, yaml, utils, memoise, 
- rvg (>= 0.2.2)
+ rvg (>= 0.3.4)
 Suggests: 
     ggplot2,
-    flextable (>= 0.7.0),
+    flextable (>= 0.9.7),
     bookdown (>= 0.13),
     testthat (>= 3.0.0),
     doconv (>= 0.3.0)

R/hooks.R

@@ -12,6 +12,11 @@ knitr_opts_current <- function(x, default = FALSE){
 #' @noRd
 plot_word_fig_caption <- function(x, options) {
 
+  if (grepl("^(ftp|ftps|http|https)://", x[1])) {
+    stop("Images in 'rdocx_document' must be local files accessible without an internet connection:\n",
+         shQuote(x[1]), call. = FALSE)
+  }
+
   if(!is.character(options$fig.cap)) options$fig.cap <- NULL
   if(!is.character(options$fig.alt)) options$fig.alt <- NULL
   if(is.null(options$fig.id))

R/rdocx_document.R

@@ -164,7 +164,10 @@ get_reference_rdocx <- memoise(get_docx_uncached)
 #'
 #' ```{r child = "man/rdocx/rmarkdown-yaml.Rmd"}
 #' ```
-#'
+#' @section Known limitations:
+#' When using `knitr::include_graphics()` in 'rdocx_document',
+#' the image must be local, while with standard 'R Markdown'
+#' output documents, images located on Internet are supported.
 #' @examples
 #' # rdocx_document basic example -----
 #' @example examples/rdocx_document.R