split idle cmd into notify+watch, remove err when empty result

src/msg/cli.rs

@@ -187,7 +187,12 @@ pub fn msg_matches(app: &App) -> Result<bool> {
 
         let mut imap_conn = ImapConnector::new(&app.account)?;
         let msgs = imap_conn.list_msgs(&app.mbox, &page_size, &page)?;
-        let msgs = Msgs::from(&msgs);
+        let msgs = if let Some(ref fetches) = msgs {
+            Msgs::from(fetches)
+        } else {
+            Msgs::new()
+        };
+
         trace!("messages: {:?}", msgs);
         app.output.print(msgs);
 
@@ -238,7 +243,11 @@ pub fn msg_matches(app: &App) -> Result<bool> {
 
         let mut imap_conn = ImapConnector::new(&app.account)?;
         let msgs = imap_conn.search_msgs(&app.mbox, &query, &page_size, &page)?;
-        let msgs = Msgs::from(&msgs);
+        let msgs = if let Some(ref fetches) = msgs {
+            Msgs::from(fetches)
+        } else {
+            Msgs::new()
+        };
         trace!("messages: {:?}", msgs);
         app.output.print(msgs);
 
@@ -637,7 +646,11 @@ pub fn msg_matches(app: &App) -> Result<bool> {
         let mut imap_conn = ImapConnector::new(&app.account)?;
         let msgs =
             imap_conn.list_msgs(&app.mbox, &app.config.default_page_size(&app.account), &0)?;
-        let msgs = Msgs::from(&msgs);
+        let msgs = if let Some(ref fetches) = msgs {
+            Msgs::from(fetches)
+        } else {
+            Msgs::new()
+        };
         app.output.print(msgs);
 
         imap_conn.logout();

src/msg/model.rs

@@ -80,7 +80,6 @@ impl<'a> Attachments {
                 .get_headers()
                 .get_first_value("content-type")
                 .unwrap_or_default();
-
             if !ctype.starts_with("text") {
                 self.0.push(Attachment::from_part(part));
             }
@@ -646,15 +645,21 @@ impl<'m> Table for Msg<'m> {
 // Msgs
 
 #[derive(Debug, Serialize)]
-pub struct Msgs<'m>(pub Vec<Msg<'m>>);
+pub struct Msgs<'a>(pub Vec<Msg<'a>>);
 
-impl<'m> From<&'m imap::types::ZeroCopy<Vec<imap::types::Fetch>>> for Msgs<'m> {
-    fn from(fetches: &'m imap::types::ZeroCopy<Vec<imap::types::Fetch>>) -> Self {
+impl<'a> From<&'a imap::types::ZeroCopy<Vec<imap::types::Fetch>>> for Msgs<'a> {
+    fn from(fetches: &'a imap::types::ZeroCopy<Vec<imap::types::Fetch>>) -> Self {
         Self(fetches.iter().rev().map(Msg::from).collect::<Vec<_>>())
     }
 }
 
-impl<'m> fmt::Display for Msgs<'m> {
+impl Msgs<'_> {
+    pub fn new() -> Self {
+        Self(vec![])
+    }
+}
+
+impl fmt::Display for Msgs<'_> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         writeln!(f, "\n{}", Table::render(&self.0))
     }