Returns a `.Future` which resolves when the process exits. Usage:: ret = yield proc.wait_for_exit() This is a coroutine

Add a file to the watch list. All imported modules are watched by default.

* Check for file existence */

md5::Finalize MD5 finalization. Ends an MD5 message-digest operation, writing the message digest and zeroizing the context.

MD5String: Performs the MD5 algorithm on a char* string, returning the results as a char*.

PrintMD5: Converts a completed md5 digest into a char* string.

md5::Update MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context.

Constructs a Rule instance. :arg Matcher matcher: a `Matcher` instance used for determining whether the rule should be considered