fix(imap-proto): handle short continuation responses

Fixes #67

imap-proto/src/parser/rfc3501.rs

@@ -471,7 +471,8 @@ named!(resp_text<(Option<ResponseCode>, Option<&str>)>, do_parse!(
 ));
 
 named!(continue_req<Response>, do_parse!(
- tag!("+ ") >>
+ tag!("+") >>
+ opt!(tag!(" ")) >> // Some servers do not send the space :/
  text: resp_text >> // TODO: base64
  tag!("\r\n") >>
  (Response::Continue {
@@ -837,4 +838,25 @@ mod tests {
  rsp => panic!("should be incomplete: {:?}", rsp),
  }
  }
+
+ #[test]
+ fn test_continuation() {
+ // regular RFC compliant
+ match parse_response(b"+ \r\n") {
+ Ok((_, Response::Continue {
+ code: None,
+ information: None,
+ })) => {}
+ rsp @ _ => panic!("unexpected response {:?}", rsp)
+ } 
+
+ // short version, sent by yandex
+ match parse_response(b"+\r\n") {
+ Ok((_, Response::Continue {
+ code: None,
+ information: None,
+ })) => {}
+ rsp @ _ => panic!("unexpected response {:?}", rsp)
+ } 
+ }
 }