Parse HIGHESTMODSEQ into Mailbox.highest_modseq

Author: link2xt

src/client.rs

@@ -1700,6 +1700,7 @@ mod tests {
             permanent_flags: vec![],
             uid_next: Some(2),
             uid_validity: Some(1257842737),
+            highest_modseq: None,
         };
         let mailbox_name = "INBOX";
         let command = format!("A0001 EXAMINE {}\r\n", quote!(mailbox_name));
@@ -1723,6 +1724,7 @@ mod tests {
             * OK [UNSEEN 1] First unseen.\r\n\
             * OK [UIDVALIDITY 1257842737] UIDs valid\r\n\
             * OK [UIDNEXT 2] Predicted next UID\r\n\
+            * OK [HIGHESTMODSEQ 90060115205545359] Highest mailbox modsequence\r\n\
             A0001 OK [READ-ONLY] Select completed.\r\n"
             .to_vec();
         let expected_mailbox = Mailbox {
@@ -1746,6 +1748,7 @@ mod tests {
             ],
             uid_next: Some(2),
             uid_validity: Some(1257842737),
+            highest_modseq: Some(90060115205545359),
         };
         let mailbox_name = "INBOX";
         let command = format!("A0001 SELECT {}\r\n", quote!(mailbox_name));

src/parse.rs

@@ -220,6 +220,9 @@ pub(crate) async fn parse_mailbox<T: Stream<Item = io::Result<ResponseData>> + U
                             Some(ResponseCode::UidNext(unext)) => {
                                 mailbox.uid_next = Some(*unext);
                             }
+                            Some(ResponseCode::HighestModSeq(highest_modseq)) => {
+                                mailbox.highest_modseq = Some(*highest_modseq);
+                            }
                             Some(ResponseCode::Unseen(n)) => {
                                 mailbox.unseen = Some(*n);
                             }

src/types/mailbox.rs

@@ -35,6 +35,9 @@ pub struct Mailbox {
     /// The unique identifier validity value.  See [`Uid`] for more details.  If this is missing,
     /// the server does not support unique identifiers.
     pub uid_validity: Option<u32>,
+
+    /// Highest mailbox mod-sequence as defined in [RFC-7162](https://tools.ietf.org/html/rfc7162).
+    pub highest_modseq: Option<u64>,
 }
 
 impl fmt::Display for Mailbox {