Document R language support features

Signed-off-by: Elijah Cúchulainn Reid <[email protected]>

Author: Wizzzzzzard

README.md

@@ -10,10 +10,21 @@ The SAS extension includes many [features](https://sassoftware.github.io/vscode-
 
 - SAS syntax highlighting and help, code completion, and code snippets
 - Navigate SAS Content and libraries, including table viewer
-- Create notebooks for SAS, SQL, Python, R, and other languages
+- Create notebooks for SAS, SQL, Python, R, Julia, and other languages
 
 <img src="website/static/images/featuresGlance.png"/>
 
+## Language Support
+
+The SAS extension provides enhanced language support for embedded languages in SAS notebooks and code files:
+
+- **Python**: Full IntelliSense support (code completion, hover, signature help) is included via Pyright
+- **R**: 
+  - **In VS Code Desktop**: Basic IntelliSense support (code completion, hover) for common R functions - no installation required
+  - **In Browser (VS Code for Web)**: Basic IntelliSense support provided automatically via WebR (no installation required)
+- **Julia**: Syntax highlighting and execution via PROC JULIA
+- **SQL** and **Lua**: Syntax highlighting and execution support
+
 ## Support
 
 ### SAS Communities

website/docs/Features/sasNotebook.md

@@ -19,6 +19,23 @@ Starting with Visual Studio Code version 1.93, [the language for SQL files has b
 
 :::
 
+## Language Support for Embedded Code
+
+SAS Notebook supports multiple languages including Python, R, SQL, and Lua. When working with these languages in SAS notebooks, enhanced language features such as code completion, hover information, and signature help are available.
+
+### Python Language Features
+
+Python code cells benefit from integrated IntelliSense powered by Pyright, which is included with the extension. No additional setup is required for Python language features.
+
+### R Language Features
+
+R code cells include basic IntelliSense features (code completion and hover documentation) for common R functions:
+
+- **In VS Code Desktop**: Basic code completion and hover information for common R functions is provided automatically - no installation required
+- **In Browser (VS Code for Web)**: Enhanced R language features are automatically available via WebR - no installation required! WebR provides basic code completion and hover information for common R functions.
+
+Note: R code execution via PROC RLANG requires a SAS connection, but the language features work independently.
+
 ## Export
 
 To export your SAS Notebook to other formats, click the **More Actions** (`...`) button on the notebook toolbar at top, and select `Export`. The following formats are supported.

website/docs/faq.md

@@ -107,3 +107,36 @@ If the options on the Problems panel toolbar are not visible, you can display th
 ### Can I control whether errors and warnings from my SAS log are displayed in the Problems panel?
 
 Yes. The `SAS.problems.log` setting controls whether problems from the SAS log are displayed in the Problems panel. This option is enabled by default. To access this option, select `File > Preferences > Settings`, and search for "sas problems".
+
+## Language Server questions
+
+### Why don't I see code completion or hover information in my PROC RLANG code?
+
+**In VS Code Desktop**: Basic R language features (code completion and hover) are provided automatically for common R functions - no installation required. If you're not seeing them:
+
+1. Make sure you're inside a `PROC RLANG` submit block
+2. Check that your cursor is positioned on R code (not SAS code)
+3. Try restarting VS Code if features don't appear
+
+**In Browser (VS Code for Web)**: R language features are automatically available via WebR. If you don't see completions:
+
+```r
+1. WebR may still be initializing - wait a few moments after opening the file
+2. Check the console log (`Help > Toggle Developer Tools`) for WebR initialization messages
+3. Refresh the page if features don\'t appear after waiting
+
+### How can I verify that R language features are working?
+
+**In VS Code Desktop**:
+1. Open a SAS file with a PROC RLANG submit block
+2. Type common R functions like `mean`, `sum`, `print`, or `paste` inside the submit block
+3. You should see autocomplete suggestions as you type
+4. Hover over these function names - you should see documentation
+
+If features don\'t work, check the VS Code console log (`Help > Toggle Developer Tools`) for errors.
+
+**In Browser (VS Code for Web)**:
+1. Open a SAS file with a PROC RLANG block
+2. Check the console log (`Help > Toggle Developer Tools`) for messages like "WebR initialized successfully"
+3. Try typing common R functions like `mean`, `sum`, or `plot` - you should see autocomplete suggestions
+```