expose context for cell language (#607)

* expose context for cell language

* Switch to using a language ID

* Update changelog

---------

Co-authored-by: Julia Silge <julia.silge@gmail.com>

Author: isabelizimm

apps/vscode/CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 1.118.0 (unreleased)
 
 - Provide F1 help at cursor in Positron (<https://github.com/quarto-dev/quarto/pull/599>)
+- Expose new context keys for the language of a specific cell (<https://github.com/quarto-dev/quarto/pull/607>)
 
 ## 1.117.0 (Release on 2024-11-07)
 

apps/vscode/src/vdoc/vdoc.ts

@@ -13,7 +13,7 @@
  *
  */
 
-import { Position, TextDocument, Uri, Range } from "vscode";
+import { Position, TextDocument, Uri, Range, commands } from "vscode";
 import { Token, isExecutableLanguageBlock, languageBlockAtPosition, languageNameFromBlock } from "quarto-core";
 
 import { isQuartoDoc } from "../core/doc";
@@ -157,8 +157,12 @@ export async function virtualDocUri(
 export function languageAtPosition(tokens: Token[], position: Position) {
   const block = languageBlockAtPosition(tokens, position);
   if (block) {
-    return languageFromBlock(block);
+    const language = languageFromBlock(block);
+    // expose cell language for use in keybindings, etc
+    commands.executeCommand('setContext', 'quarto.cellLangId', language?.ids[0]);
+    return language;
   } else {
+    commands.executeCommand('setContext', 'quarto.cellLangId', undefined);
     return undefined;
   }
 }