Add code quality checks

.drone.yml

@@ -0,0 +1,39 @@
+---
+kind: pipeline
+type: docker
+name: default
+
+steps:
+  - name: fetch_dependencies
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    commands:
+      - cargo fetch
+
+  - name: code_quality
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    depends_on:
+      - fetch_dependencies
+    commands:
+      - rustup component add clippy
+      - cargo clippy -- -D warnings
+
+  - name: test
+    image: rust
+    volumes:
+      - name: rust_registry
+        path: /usr/local/cargo/registry
+    depends_on:
+      - code_quality
+    commands:
+      - cargo test
+
+volumes:
+  - name: rust_registry
+    temp: {}
+

README.md

@@ -0,0 +1,4 @@
+# MailSender
+Basic command line tool that can be used to send email, using the SMTP protocol.
+
+This tool has been written in Rust, using the `lettre` crate.

renovate.json

@@ -0,0 +1,5 @@
+{
+  "extends": [
+    "local>renovate/presets"
+  ]
+}

src/main.rs

@@ -1,8 +1,9 @@
 use clap::Parser;
-use lettre::message::header::ContentType;
 use lettre::message::Mailbox;
-use lettre::{Message, SmtpTransport, Transport};
+use lettre::message::header::ContentType;
+use lettre::transport::smtp::authentication::Credentials;
 use lettre::transport::smtp::extension::ClientId;
+use lettre::{Message, SmtpTransport, Transport};
 
 /// Simple mail sender
 #[derive(Parser, Debug)]
@@ -48,12 +49,20 @@ struct Args {
     #[arg(long)]
     smtp_port: Option<u16>,
 
+    /// SMTP username
+    #[arg(long)]
+    smtp_username: Option<String>,
+
+    /// SMTP password
+    #[arg(long)]
+    smtp_password: Option<String>,
+
     /// Disable TLS
     #[arg(long)]
     disable_tls: bool,
 
     /// Relay name
-    #[arg(long, default_value = "mail-out.mail.internal")]
+    #[arg(long, default_value = "my-computer.com")]
     smtp_relay_name: String,
 }
 
@@ -87,6 +96,11 @@ fn main() {
         false => SmtpTransport::relay(&args.smtp_domain).unwrap(),
     };
     mailer = mailer.hello_name(ClientId::Domain(args.smtp_relay_name));
+
+    if let (Some(username), Some(password)) = (args.smtp_username, args.smtp_password) {
+        mailer = mailer.credentials(Credentials::new(username, password));
+    }
+
     if let Some(port) = args.smtp_port {
         mailer = mailer.port(port);
     }
@@ -103,3 +117,14 @@ fn main() {
         Err(e) => panic!("Could not send email: {e:?}"),
     }
 }
+
+
+#[cfg(test)]
+mod test {
+    use crate::Args;
+    #[test]
+    fn verify_cli() {
+        use clap::CommandFactory;
+        Args::command().debug_assert()
+    }
+}