fix: handle unsupported language errors gracefully in read_file tool

Instead of failing with an error when encountering an unsupported language,
now logs a warning and continues with file reading. This provides a better
user experience by still showing the file contents even if syntax
highlighting is not available.

Fixes: #3269
Signed-off-by: Eric Wheeler <[email protected]>

Author: Eric Wheeler

src/core/tools/readFileTool.ts

@@ -164,7 +164,21 @@ export async function readFileTool(
 
 				const res = await Promise.all([
 					maxReadFileLine > 0 ? readLines(absolutePath, maxReadFileLine - 1, 0) : "",
-					parseSourceCodeDefinitionsForFile(absolutePath, cline.rooIgnoreController),
+					(async () => {
+						try {
+							return await parseSourceCodeDefinitionsForFile(absolutePath, cline.rooIgnoreController)
+						} catch (error) {
+							if (error instanceof Error && error.message.startsWith("Unsupported language:")) {
+								console.warn(`[read_file] Warning: ${error.message}`)
+								return undefined
+							} else {
+								console.error(
+									`[read_file] Unhandled error: ${error instanceof Error ? error.message : String(error)}`,
+								)
+								return undefined
+							}
+						}
+					})(),
 				])
 
 				content = res[0].length > 0 ? addLineNumbers(res[0]) : ""