Implement Recent in Select

src/imap/command/authenticated.rs

@@ -106,8 +106,6 @@ impl<'a> StateContext<'a> {
         let sum = mb.summary().await?;
         tracing::trace!(summary=%sum, "mailbox.summary");
 
-        let body = vec![Data::Exists(sum.exists.try_into()?), Data::Recent(0)];
-
         let r_unseen = Status::ok(
             None,
             Some(Code::Unseen(
@@ -118,33 +116,47 @@ impl<'a> StateContext<'a> {
         .map_err(Error::msg)?;
         //let r_permanentflags = Status::ok(None, Some(Code::
 
-        let tr = flow::Transition::Select(mb);
+        let mut res = Vec::<ImapRes>::new();
 
-        Ok((
-            vec![
-                ImapRes::Data(Data::Exists(0)),
-                ImapRes::Data(Data::Recent(0)),
-                ImapRes::Data(Data::Flags(vec![])),
-                ImapRes::Status(
-                    Status::ok(
+        res.push(ImapRes::Data(Data::Exists(sum.exists)));
+
+        res.push(ImapRes::Data(Data::Recent(sum.recent)));
+
+        res.push(ImapRes::Data(Data::Flags(vec![])));
+
+        let uid_validity = Status::ok(
             None,
             Some(Code::UidValidity(sum.validity)),
             "UIDs valid"
             )
-                    .map_err(Error::msg)?,
-                ),
-                /*ImapRes::Status(),
-                ImapRes::Status(),*/
-                ImapRes::Status(
-                    Status::ok(
+            .map_err(Error::msg)?;
+        res.push(ImapRes::Status(uid_validity));
+
+        let next_uid = Status::ok(
+            None,
+            Some(Code::UidNext(sum.next)),
+            "Predict next UID"
+        ).map_err(Error::msg)?;
+        res.push(ImapRes::Status(next_uid));
+
+        if let Some(unseen) = sum.unseen {
+            let status_unseen = Status::ok(
+                None,
+                Some(Code::Unseen(unseen.clone())),
+                "First unseen UID",
+            )
+            .map_err(Error::msg)?;
+            res.push(ImapRes::Status(status_unseen));
+        }
+
+        let last = Status::ok(
             Some(self.tag.clone()),
             Some(Code::ReadWrite),
             "Select completed",
-                    )
-                    .map_err(Error::msg)?,
-                ),
-            ],
-            tr,
-        ))
+        ).map_err(Error::msg)?;
+        res.push(ImapRes::Status(last));
+
+        let tr = flow::Transition::Select(mb);
+        Ok((res, tr))
     }
 }

src/mailbox.rs

@@ -1,3 +1,5 @@
+use std::convert::TryFrom;
+
 use anyhow::Result;
 use k2v_client::K2vClient;
 use rusoto_s3::S3Client;
@@ -8,12 +10,14 @@ use crate::login::Credentials;
 use crate::mail_ident::*;
 use crate::uidindex::*;
 
-pub struct Summary {
+pub struct Summary<'a> {
     pub validity: ImapUidvalidity,
     pub next: ImapUid,
-    pub exists: usize,
+    pub exists: u32,
+    pub recent: u32,
+    pub unseen: Option<&'a ImapUid>,
 }
-impl std::fmt::Display for Summary {
+impl std::fmt::Display for Summary<'_> {
     fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
         write!(
             f,
@@ -23,6 +27,9 @@ impl std::fmt::Display for Summary {
     }
 }
 
+
+// Non standard but common flags:
+// https://www.iana.org/assignments/imap-jmap-keywords/imap-jmap-keywords.xhtml
 pub struct Mailbox {
     bucket: String,
     pub name: String,
@@ -34,6 +41,8 @@ pub struct Mailbox {
     uid_index: Bayou<UidIndex>,
 }
 
+// IDEA: We store a specific flag named $unseen.
+// If it is not present, we add the virtual flag \Seen
 impl Mailbox {
     pub fn new(creds: &Credentials, name: String) -> Result<Self> {
         let uid_index = Bayou::<UidIndex>::new(creds, name.clone())?;
@@ -52,10 +61,15 @@ impl Mailbox {
         self.uid_index.sync().await?;
         let state = self.uid_index.state();
 
+        let unseen = state.idx_by_flag.get(&"$unseen".to_string()).and_then(|os| os.get_min());
+        let recent = state.idx_by_flag.get(&"\\Recent".to_string()).map(|os| os.len()).unwrap_or(0);
+
         return Ok(Summary {
             validity: state.uidvalidity,
             next: state.uidnext,
-            exists: state.idx_by_uid.len(),
+            exists: u32::try_from(state.idx_by_uid.len())?,
+            recent: u32::try_from(recent)?,
+            unseen,
         });
     }
 

src/uidindex.rs

@@ -182,6 +182,9 @@ impl FlagIndex {
             self.0.get_mut(flag).and_then(|set| set.remove(&uid));
         });
     }
+    pub fn get(&self, f: &Flag) -> Option<&OrdSet<ImapUid>> {
+        self.0.get(f)
+    } 
 }
 
 // ---- CUSTOM SERIALIZATION AND DESERIALIZATION ----