The rstudioapi package provides an interface for interacting with the RStudio IDE with R code. Using rstudioapi, you can:
Examine, manipulate, and save the contents of documents currently open in RStudio,
Create, open, or re-open RStudio projects,
Prompt the user with different kinds of dialogs (e.g. for selecting a file or folder, or requesting a password from the user),
Interact with RStudio terminals,
Interact with the R session associated with the current RStudio instance.
Please see the other articles for more detailed information.