include_graphics should error if file doesn't exist

[hadley]

It would be useful if include_graphics() threw an error if the image did not exist. Otherwise it's easy to miss broken images.

knitr::include_graphics("sadf")
#> [1] "sadf"
#> attr(,"class")
#> [1] "knit_image_paths" "knit_asis"   

[yihui]

The main reason I didn't do it because It can also include images from http resources if the output format is HTML.

If the document is compiled to PDF, you should discover that the image is missing from the LaTeX error log.

[hadley]

Only check if the path is not a url?

(But there's no hint in the documentation that you can use urls, so I doubt many people rely on this behaviour)

[yihui]

Done. Thanks!

[NMarkgraf]

This is not a good idea! - If your child documents are in a subfolder and your images are in an other subfolder this would lead to an error even in pdflatex would handle it correctly!

PLEASE use a default value for "error=..." which can be set to knitr to set it to FALSE or TRUE for a whole document! I have to replace several documents by hand ...

[yihui]

@NMarkgraf I just provided an global option (6daea79). You could override the function, e.g.

include_graphics = function(...) {
  knitr::include_graphics(..., error = FALSE)
}

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