Add xcodeVersionFromXcodeBuild

src/platform.ts

@@ -115,6 +115,76 @@ export function xcodeVersionFromLink(
   }
 }
 
+/**
+ * Tries to determine the version of Xcode that is installed by running `xcrun xcodebuild -version`.
+ *
+ * @param logger The logger to use.
+ * @returns The Xcode version or `undefined` if it couldn't be determined.
+ */
+export async function xcodeVersionFromXcodeBuild(
+  logger: Logger,
+): Promise<semver.SemVer | undefined> {
+  try {
+    const xcrun = await io.which("xcrun", true);
+    let stdout = "";
+    let stderr = "";
+
+    const exitCode = await new toolrunner.ToolRunner(
+      xcrun,
+      ["xcodebuild", "-version"],
+      {
+        silent: true,
+        ignoreReturnCode: true,
+        listeners: {
+          stdout: (data: Buffer) => {
+            stdout += data.toString("utf-8");
+          },
+          stderr: (data: Buffer) => {
+            stderr += data.toString("utf-8");
+          },
+        },
+      },
+    ).exec();
+
+    if (exitCode !== 0) {
+      logger.debug(`xcodebuild returned exit code ${exitCode}`);
+      logger.debug(`stdout:\n${stdout}`);
+      logger.debug(`stderr:\n${stderr}`);
+      return undefined;
+    }
+
+    // The output contains a couple of lines, but we only care about the product version.
+    const match = stdout.match(/^Xcode (\d+(\.\d+)?)/);
+
+    if (match === null) {
+      logger.debug(
+        `Output doesn't appear to contain the Xcode product version.`,
+      );
+      logger.debug(`stdout:\n${stdout}`);
+      logger.debug(`stderr:\n${stderr}`);
+      return undefined;
+    }
+
+    // We expect the output to only be a version string. Try to parse it into a semver.
+    const version = semver.coerce(match[1].trim());
+
+    if (version === null) {
+      logger.debug(
+        `xcodebuild's output couldn't be parsed as a version:\n${stdout}`,
+      );
+      logger.debug(`stderr:\n${stderr}`);
+      return undefined;
+    }
+
+    return version;
+  } catch (err) {
+    logger.debug(
+      `Unable to determine Xcode version from xcodebuild: ${getErrorMessage(err)}`,
+    );
+    return undefined;
+  }
+}
+
 /**
  * Tries to determine the version of Xcode that is installed by running `xcrun --sdk macosx --show-sdk-version`.
  *