goLanguageServer: print out all GOPATHs when there are multiple

Updates #1848

Change-Id: I482625276bd4dd8adefea90c0ae595c77abae48c
Reviewed-on: https://go-review.googlesource.com/c/vscode-go/+/356909
Trust: Rebecca Stambler <[email protected]>
Run-TryBot: Rebecca Stambler <[email protected]>
Reviewed-by: Suzy Mueller <[email protected]>

Author: stamblerre

src/goLanguageServer.ts

@@ -1023,7 +1023,7 @@ export function getLanguageServerToolPath(): string {
 	// Check that all workspace folders are configured with the same GOPATH.
 	if (!allFoldersHaveSameGopath()) {
 		vscode.window.showInformationMessage(
-			'The Go language server is currently not supported in a multi-root set-up with different GOPATHs.'
+			`The Go language server is currently not supported in a multi-root set-up with different GOPATHs (${gopathsPerFolder()}).`
 		);
 		return;
 	}
@@ -1057,6 +1057,14 @@ function allFoldersHaveSameGopath(): boolean {
 	return vscode.workspace.workspaceFolders.find((x) => tempGopath !== getCurrentGoPath(x.uri)) ? false : true;
 }
 
+function gopathsPerFolder(): string[] {
+	const result: string[] = [];
+	for (const folder of vscode.workspace.workspaceFolders) {
+		result.push(getCurrentGoPath(folder.uri));
+	}
+	return result;
+}
+
 export async function shouldUpdateLanguageServer(
 	tool: Tool,
 	cfg: LanguageServerConfig,