Do not respond to or log ignored commands.

src/bot.rs

@@ -143,10 +143,14 @@ impl DiceBot {
             }
         }
 
+        if results.len() >= 1 {
             if results.len() == 1 {
                 let cmd_result = &results[0];
                 let response = AnyMessageEventContent::RoomMessage(MessageEventContent::Notice(
-                NoticeMessageEventContent::html(cmd_result.plain.clone(), cmd_result.html.clone()),
+                    NoticeMessageEventContent::html(
+                        cmd_result.plain.clone(),
+                        cmd_result.html.clone(),
+                    ),
                 ));
 
                 let result = self.client.room_send(&room_id, response, None).await;
@@ -154,7 +158,7 @@ impl DiceBot {
                     let message = extract_error_message(e);
                     error!("Error sending message: {}", message);
                 };
-        } else {
+            } else if results.len() > 1 {
                 let message = format!("{}: Executed {} commands", sender_username, results.len());
                 let response = AnyMessageEventContent::RoomMessage(MessageEventContent::Notice(
                     NoticeMessageEventContent::html(&message, &message),
@@ -170,6 +174,7 @@ impl DiceBot {
             info!("[{}] {} executed: {}", room_name, sender_username, msg_body);
         }
     }
+}
 
 /// Check if a message is recent enough to actually process. If the
 /// message is within "oldest_message_age" seconds, this function

src/commands.rs

@@ -43,7 +43,8 @@ pub trait Command: Send + Sync {
 
 /// Parse a command string into a dynamic command execution trait
 /// object. Returns an error if a command was recognized but not
-/// parsed correctly. Returns Ok(None) if no command was recognized.
+/// parsed correctly. Returns IgnoredCommand error if no command was
+/// recognized.
 pub fn parse(s: &str) -> Result<Box<dyn Command>, BotError> {
     match parser::parse_command(s) {
         Ok(command) => Ok(command),