rstudioapi 
The rstudioapi package is designed to make it easy to conditionally
access the RStudio API from CRAN packages, avoiding
any potential problems with R CMD check. This package contains a
handful of useful wrapper functions to access the API. To see the
functions that are currently available in the API, run
help(package = "rstudioapi")
Installation
You can install the released version of rstudioapi from
CRAN with:
install.packages("rstudioapi")And the development version from GitHub with:
# install.packages("devtools")
devtools::install_github("rstudio/rstudioapi")Example
The rstudioapi package is designed to never be attached to your search
path. Always prefix function calls with rstudioapi::.
# Returns T/F
rstudioapi::isAvailable()
# Returns error if not available
rstudioapi::verifyAvailable()
# Optional argument allows you to specify version requirement
rstudioapi::isAvailable("0.99")
rstudioapi::verifyAvailable("0.99")
# Call an rstudio function
rstudioapi::callFun("viewer", "http://localhost:8080")
# This will raise an error if rstudio is not running, or the function
# is not found. To run a different function if it's not available,
# use exists
if (rstudioapi::hasFun("viewer")) {
rstudioapi::callFun("viewer", "http://localhost:8080")
} else {
browseURL("http://localhost:8080")
}
# You can use find to get the function. Throws an error if the function
# does not exist.
rstudioapi::findFun("viewer")
# You can also check version in exists and find
rstudioapi::findFun("viewer", 0.99)
rstudioapi::hasFun("viewer", 0.99)