Fix var swapping in finalize_message

src/smtp.rs

@@ -1,4 +1,5 @@
 use std::io::{BufRead, BufReader, Write};
+use std::mem;
 use std::net::{TcpListener, TcpStream};
 
 pub fn start_server() {
@@ -12,7 +13,13 @@ pub fn start_server() {
                 let reader = BufReader::new(tcp_stream.try_clone().unwrap());
 
                 let mut connection = Connection::new();
-                let _ = connection.handle(tcp_stream, reader);
+                if let Err(e) = connection.handle(tcp_stream, reader) {
+                    eprintln!("System error: {}", e)
+                } else {
+                    for mail in connection.messages {
+                        println!("Mail from {} for {}\n{}", mail.sender, mail.recipients.join(", "), mail.data.unwrap_or("<empty>".to_string()))
+                    }
+                }
             }
             Err(e) => {
                 eprintln!("Failed to accept connection: {}", e)
@@ -102,14 +109,14 @@ impl Connection {
                 send(&mut writer, out)?;
 
                 if out == MSG_BYE {
-                    break
+                    break;
                 }
             }
 
             line.clear()
         }
 
-        return Ok(())
+        return Ok(());
     }
 
     fn handle_line(&mut self, line: &String) -> Result<Option<&str>, &'static str> {
@@ -147,7 +154,7 @@ impl Connection {
             ConnectionState::Data => {
                 if line.trim_end() == CMD_DOT {
                     self.state = ConnectionState::Done;
-                    return Ok(Some(MSG_OK))
+                    return Ok(Some(MSG_OK));
                 }
 
                 return match self.current_message {
@@ -163,18 +170,17 @@ impl Connection {
                     _ => {
                         Err(MSG_FAIL)
                     }
-                }
-
+                };
             }
             ConnectionState::Done => {
                 if line.starts_with(CMD_QUIT) {
                     self.finalize_mail();
-                    return Ok(Some(MSG_BYE))
+                    return Ok(Some(MSG_BYE));
                 }
 
                 if line.starts_with(CMD_MAIL_FROM) {
                     self.finalize_mail();
-                    return Ok(Some(MSG_OK))
+                    return Ok(Some(MSG_OK));
                 }
             }
         }
@@ -183,9 +189,10 @@ impl Connection {
     }
 
     fn finalize_mail(&mut self) {
-        if let Some(mail) = &self.current_message {
-            self.current_message = None;
-            self.messages.push(*mail)
+        let current_message = mem::replace(&mut self.current_message, None);
+
+        if let Some(mail) = current_message {
+            self.messages.push(mail)
         }
     }