Add switch to omit image file extension in Markdown output

[wuffi]

The auto_pdf option of knitr's include_graphics() function is very helpful and it would be great to have this option also for other formats.

Instead of modifying the include_graphics function itself would be to use Pandoc's -default-image-extension command-line option.
This does however require image paths without an extension (i.e. my_image instead of my_image.png) in the Markdown syntax, which is as far as I can see not possible with knitr.

Directly specifying the image path in a RMarkdown file in Markdown syntax does not allow to flexibly change for example the image width in contrast to knitr's include_graphics() function.

[cderv]

Can you share a reproducible example of the ideal markdown you want to write?

Instead of modifying the include_graphics function itself would be to use Pandoc's -default-image-extension command-line option.

Using this option means it is more rmarkdown feature than knitr, as knitr is not necessarily used with Pandoc.

FWIW we did expose this options in Quarto for multi format image: https://quarto.org/docs/authoring/figures.html#multiformat-figures

Quarto with R use knitr too.

In R Markown, we don't have a YAML configuration field for it, but I am sure it can be passed using pandoc_args

So I am trying to see what the issue is exactly.
Is this with computed images? Several images can be created for one cell using a vector in graphic option.
Is this with include_graphics? auto_pdf is there for helping with this. Is what you report a feature request to make auto_pdf more generic ?

This does however require image paths without an extension (i.e. my_image instead of my_image.png) in the Markdown syntax, which is as far as I can see not possible with knitr.

Maybe this is the real case: How to produce from knitr image without extension ?

Anyhow, as you see many question - sorry for that 😅 Having some Rmd example would help see exactly the ideal situation you are seeking.

Thank you !

[wuffi]

Thanks for your reply and help: A feature request to make the auto_pdf more generic is exactly what I wanted to communicate!

Computed images work very nice and are well controllable. The option/feature request would be helpful for existing, external images.