Use resolve extractor when finding autobuild scripts

src/codeql.ts

@@ -196,6 +196,8 @@ export interface CodeQL {
     config: Config,
     features: FeatureEnablement
   ): Promise<void>;
+  /** Get the location of an extractor for the specified language. */
+  resolveExtractor(language: Language): Promise<string>;
 }
 
 export interface ResolveLanguagesOutput {
@@ -418,6 +420,7 @@ export function setCodeQL(partialCodeql: Partial<CodeQL>): CodeQL {
       "databaseExportDiagnostics"
     ),
     diagnosticsExport: resolveFunction(partialCodeql, "diagnosticsExport"),
+    resolveExtractor: resolveFunction(partialCodeql, "resolveExtractor"),
   };
   return cachedCodeQL;
 }
@@ -547,17 +550,10 @@ export async function getCodeQLForCmd(
       );
     },
     async runAutobuild(language: Language) {
-      const cmdName =
-        process.platform === "win32" ? "autobuild.cmd" : "autobuild.sh";
-      // The autobuilder for Swift is located in the experimental/ directory.
-      const possibleExperimentalDir =
-        language === Language.swift ? "experimental" : "";
       const autobuildCmd = path.join(
-        path.dirname(cmd),
-        possibleExperimentalDir,
-        language,
+        await this.resolveExtractor(language),
         "tools",
-        cmdName
+        process.platform === "win32" ? "autobuild.cmd" : "autobuild.sh"
       );
 
       // Update JAVA_TOOL_OPTIONS to contain '-Dhttp.keepAlive=false'
@@ -590,37 +586,11 @@ export async function getCodeQLForCmd(
     },
     async extractScannedLanguage(config: Config, language: Language) {
       const databasePath = util.getCodeQLDatabasePath(config, language);
-      // Get extractor location
-      //
-      // Request it using `format=json` so we don't need to strip the trailing new line generated by
-      // the CLI.
-      let extractorPath = "";
-      await new toolrunner.ToolRunner(
-        cmd,
-        [
-          "resolve",
-          "extractor",
-          "--format=json",
-          `--language=${language}`,
-          ...getExtraOptionsFromEnv(["resolve", "extractor"]),
-        ],
-        {
-          silent: true,
-          listeners: {
-            stdout: (data) => {
-              extractorPath += data.toString();
-            },
-            stderr: (data) => {
-              process.stderr.write(data);
-            },
-          },
-        }
-      ).exec();
 
       // Set trace command
       const ext = process.platform === "win32" ? ".cmd" : ".sh";
       const traceCommand = path.resolve(
-        JSON.parse(extractorPath) as string,
+        await this.resolveExtractor(language),
         "tools",
         `autobuild${ext}`
       );
@@ -954,6 +924,33 @@ export async function getCodeQLForCmd(
       }
       await new toolrunner.ToolRunner(cmd, args).exec();
     },
+    async resolveExtractor(language: Language): Promise<string> {
+      // Request it using `format=json` so we don't need to strip the trailing new line generated by
+      // the CLI.
+      let extractorPath = "";
+      await new toolrunner.ToolRunner(
+        cmd,
+        [
+          "resolve",
+          "extractor",
+          "--format=json",
+          `--language=${language}`,
+          ...getExtraOptionsFromEnv(["resolve", "extractor"]),
+        ],
+        {
+          silent: true,
+          listeners: {
+            stdout: (data) => {
+              extractorPath += data.toString();
+            },
+            stderr: (data) => {
+              process.stderr.write(data);
+            },
+          },
+        }
+      ).exec();
+      return JSON.parse(extractorPath);
+    },
   };
   // To ensure that status reports include the CodeQL CLI version wherever
   // possible, we want to call getVersion(), which populates the version value