R Language Service

The R language service implements the Language Server Protocol and provides a set of language analysis features such as completion, signature, hover, definition, references, diagnostics, etc.

The language service is provided by the R language server (implemented by languageserver) which performs static code analysis with the latest user documents in R and Rmd languages. Therefore, it does not rely on an active R session and thus does not require the code to be executed.

To install the package from CRAN:

install.packages("languageserver")

To experience the latest features, install the package from GitHub:

remotes::install_github("REditorSupport/languageserver")

Settings

The following settings could be set up to deviate from the default behavior:

r.lsp.enabled: Enable the R language service (default).
r.rpath.windows, r.rpath.mac, r.rpath.linux: Path to R binary for launching the R Language Server package (see below). Examples: /usr/bin/R (Linux/macOS), C:\\Program Files\\R\\R-4.1.0\\bin\\x64\\R.exe (Windows). If the settings are left blank (default), then the R path will be detected from the PATH environment variable and Windows registry. It should be vanilla R rather than radian console.
r.lsp.args: The command line arguments to use when launching R Language Server. Example: --vanilla to disable loading startup scripts such as .Rprofile and Rprofile.site.
r.lsp.debug: Enable debugging traces. Defaults to false. Set this to true if you are having trouble getting the Language Server working.
r.lsp.diagnostics: Enable linting of R code, using the lintr package. Defaults to true. To disable this, you must have at least version 0.2.7 of the R Language Server installed.