Redirecting stdin during knitting alternatively providing knitr::is_interactive

[gforge]

I currently use the base::interactive() to see if I should output to the viewer or to the stdout in case the document is being knitted for my htmlTable:::print.htmlTable. This works great in RStudio but I noticed that with devtools::build_vignettes the tables in the vignette are outputted to the viewer instead of into the document. I have currently solved this by using options(interactive = FALSE) but it seems clumsy and I wonder if you would consider either:

1. Redirecting stdin during knitting (not sure this is possible)
2. Providing a knitr::is_interactive function that I could rely on to check if the document is being knitted.

[yihui]

You can check isTRUE(getOption('knitr.in.progress')):

knitr/R/output.R

Line 158 in 6f69c42

knitr.in.progress = TRUE, device = pdf_null

But it seems to me that this is not an appropriate way to go. The better way is to define the knit_print.htmlTable method: http://cran.rstudio.com/web/packages/knitr/vignettes/knit_print.html

[gforge]

Thank you! Works like a charm - sorry for missing this amazing feature. I was actually not aware that it was possible to change print().

I'm considering extending my htmlTable to LaTeX & markdown (although the latter will naturally have a rather crude layout). Have you considered adding an knit_print argument output that indicates the final target output, i.e. html/markdown/latex?

[yihui]

You need to check opts_knit$get('rmarkdown.pandoc.to') to see if it is R Markdown v2; if it is not, then check opts_knit$get('out.format') to see what the output type is, e.g. https://github.com/yihui/printr/blob/master/R/help.R#L36-L38 (note you may not use pandoc_to or out_format() since they are not exported, and R CMD check may complain if you do)

[github-actions]

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