I don't know if this is better here or in your Cookbook.
I think it would be worth adding a short section documenting your own solution here to making RMarkdown appear in the Linguist Languages statistics of a GitHub repository by add the following line to the .gitattributes file
*.Rmd linguist-detectable
or even safer catch the fully lower case .rmd file extension as well
*.[Rr]md linguist-detectable
It would be worth explaining that by default Linguist ignores R Markdown (RMarkdown in Linguist) from the Languages statistics because it's defined as type: prosehere and files of that type are excluded from the statistics without the linguist-detectable override as detailed here.
I assign the copyright of this contribution to the authors of the book "R Markdown: The Definitive Guide".
I don't know if this is better here or in your Cookbook.
I think it would be worth adding a short section documenting your own solution here to making RMarkdown appear in the Linguist Languages statistics of a GitHub repository by add the following line to the
.gitattributesfileor even safer catch the fully lower case
.rmdfile extension as wellIt would be worth explaining that by default Linguist ignores R Markdown (
RMarkdownin Linguist) from the Languages statistics because it's defined astype: prosehere and files of that type are excluded from the statistics without thelinguist-detectableoverride as detailed here.