Apply clippy feedback

src/http.rs

@@ -1,6 +1,6 @@
-use rouille::{router, Request, Response, try_or_400, post_input};
 use crate::random_names::get_name;
 use crate::state::{Mailbox, State};
+use rouille::{post_input, router, try_or_400, Request, Response};
 
 pub fn http_handler(request: &Request, state: &State) -> Response {
     router!(request,

src/main.rs

@@ -1,12 +1,12 @@
-extern crate rouille;
 extern crate rand;
+extern crate rouille;
 
 use std::thread;
 
 mod http;
 mod random_names;
-mod state;
 mod smtp;
+mod state;
 
 fn main() {
     println!("Starting on localhost:8005");

src/smtp.rs

@@ -1,5 +1,5 @@
 use std::io::{BufRead, BufReader, Write};
-use std::mem;
+
 use std::net::{TcpListener, TcpStream};
 
 pub fn start_server() {
@@ -17,7 +17,12 @@ pub fn start_server() {
                     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()))
+                        println!(
+                            "Mail from {} for {}\n{}",
+                            mail.sender,
+                            mail.recipients.join(", "),
+                            mail.data.unwrap_or("<empty>".to_string())
+                        )
                     }
                 }
             }
@@ -85,7 +90,11 @@ impl Connection {
         }
     }
 
-    fn handle(&mut self, mut writer: TcpStream, mut reader: BufReader<TcpStream>) -> Result<(), &str> {
+    fn handle(
+        &mut self,
+        mut writer: TcpStream,
+        mut reader: BufReader<TcpStream>,
+    ) -> Result<(), &str> {
         send(&mut writer, MSG_BANNER)?;
 
         let mut line = String::new();
@@ -93,7 +102,7 @@ impl Connection {
         loop {
             let read_result = reader.read_line(&mut line);
 
-            if read_result.is_err() || line.len() == 0 {
+            if read_result.is_err() || line.is_empty() {
                 return Err(ERR_READ_FAILED);
             }
 
@@ -101,9 +110,7 @@ impl Connection {
 
             let response = self.handle_line(&line);
 
-            if let Err(_e) = response {
-                return Err(_e); // _e
-            }
+            response?;
 
             if let Ok(Some(out)) = response {
                 send(&mut writer, out)?;
@@ -116,10 +123,10 @@ impl Connection {
             line.clear()
         }
 
-        return Ok(());
+        Ok(())
     }
 
-    fn handle_line(&mut self, line: &String) -> Result<Option<&str>, &'static str> {
+    fn handle_line(&mut self, line: &str) -> Result<Option<&str>, &'static str> {
         match self.state {
             ConnectionState::PreHello => {
                 if line.starts_with(CMD_HELLO) {
@@ -129,7 +136,7 @@ impl Connection {
             }
             ConnectionState::Hello => {
                 if line.starts_with(CMD_MAIL_FROM) {
-                    self.current_message = Some(Message::new(line.clone()));
+                    self.current_message = Some(Message::new(line.to_owned()));
                     self.state = ConnectionState::Mail;
                     return Ok(Some(MSG_OK));
                 }
@@ -167,9 +174,7 @@ impl Connection {
 
                         Ok(None)
                     }
-                    _ => {
-                        Err(MSG_FAIL)
-                    }
+                    _ => Err(MSG_FAIL),
                 };
             }
             ConnectionState::Done => {
@@ -189,17 +194,17 @@ impl Connection {
     }
 
     fn finalize_mail(&mut self) {
-        let current_message = mem::replace(&mut self.current_message, None);
+        let current_message = self.current_message.take();
 
         if let Some(mail) = current_message {
             self.messages.push(mail)
         }
     }
 
-    fn add_recipient(&mut self, line: &String) -> Result<(), &'static str> {
+    fn add_recipient(&mut self, line: &str) -> Result<(), &'static str> {
         match self.current_message {
             Some(ref mut message) => {
-                message.recipients.push(line.clone());
+                message.recipients.push(line.to_owned());
                 self.state = ConnectionState::PreData
             }
             _ => {

src/state.rs

@@ -1,6 +1,6 @@
+use chrono::{DateTime, Utc};
 use std::collections::HashMap;
 use std::sync::Mutex;
-use chrono::{DateTime, Utc};
 
 pub type State = Mutex<HashMap<String, Mailbox>>;
 
@@ -12,13 +12,13 @@ pub struct Message {
     pub from: String,
     pub received: DateTime<Utc>,
     pub subject: String,
-    pub body: String
+    pub body: String,
 }
 
 pub struct Mailbox {
     pub email: String,
     pub messages: Vec<Message>,
-    pub created_at: DateTime<Utc>
+    pub created_at: DateTime<Utc>,
 }
 
 impl Mailbox {
@@ -26,7 +26,7 @@ impl Mailbox {
         Self {
             email,
             messages: Vec::new(),
-           created_at: Utc::now()
+            created_at: Utc::now(),
         }
     }
 }