fix: only send email on demand

fix: format mail as html

src/mail.rs

@@ -56,7 +56,7 @@ pub fn send_notification(
             "PR-tracker: {pr_number}: {pr_title} has reached {:?}",
             branches
         ))
-        .header(ContentType::TEXT_PLAIN)
+        .header(ContentType::TEXT_HTML)
         .body(body)
         .unwrap();
 

src/main.rs

@@ -201,6 +201,7 @@ async fn update_subscribers<S>(_request: Request<S>) -> http_types::Result<Respo
                         println!("{:#?}", val);
                         let to_do = &current - &val;
                         println!("They will be notified for: {:#?}", to_do);
+                        if !to_do.is_empty() {
                             send_notification(
                                 &file_name,
                                 &to_do,
@@ -210,6 +211,7 @@ async fn update_subscribers<S>(_request: Request<S>) -> http_types::Result<Respo
                             )?;
                         }
                     }
+                }
                 if !remaining {
                     println!("Removing {}", dir_name);
                     remove_dir_all(dir_path)?;