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 does static code analysis with the latest user documents in R and Rmd languages. The package is required to enable the language service:

install.packages("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 Windows registry and PATH environment variable. 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.

Completion

Signature

Hover

Document highlight

Document symbol

Workspace symbol

Diagnostics

Formatting

Code actions

Go to definition

Find references

Rename symbol

Call hierarchy

Code folding

Document link

Color picker

Document selection