Support for Rmd files

[holgerbrandl]

Easy way: provide patches to intellij markdown to support [R-markdown chunk option]{https://yihui.name/knitr/options/} syntax

See

• https://github.com/JetBrains/intellij-plugins/blob/master/markdown/src/org/intellij/plugins/markdown/injection/CodeFenceInjector.java

In particular https://github.com/JetBrains/intellij-plugins/blob/master/markdown/src/org/intellij/plugins/markdown/injection/LanguageGuesser.java would need to be changed to support {R, fig.size=)

Once auto-injection into Rmd is established, we could use r4intellij to provide

• chunk execution
• until current (re)execution
• add UI for chunk options

[jeanbza]

This would be amazing!