Method retry

src/main/java/com/diffplug/gradle/FileMisc.java:118–130

Retries an action every ms, for 250ms, until it finally works or fails. Makes FS operations more reliable.

(File input, Throwing.Function<File, T> function)

	 * Makes FS operations more reliable.
	 */
	private static <T> T retry(File input, Throwing.Function<File, T> function) {
		long start = System.currentTimeMillis();
		Throwable lastException;
		do {
			try {
				return function.apply(input);
			} catch (Throwable e) {
				lastException = e;
				Errors.suppress().run(() -> Thread.sleep(1));
			}
		} while (System.currentTimeMillis() - start < MS_RETRY);
		throw Errors.asRuntime(lastException);
	}

	/** Returns true if the given directory exists, and waits up to 500ms for the directory to exist. */
	public static boolean dirExists(File dir) {