fix split parser for tuple struct with len <2

crates/teloxide-macros/src/fields_parse.rs

@@ -125,8 +125,8 @@ fn parser_with_separator<'a>(
                         })?;
 
                         <#types>::from_str(s).map_err(|e| teloxide::utils::command::ParseError::IncorrectFormat(e.into()))?
-                    }
+                    },
-                ),*
+                )*
             )
         }
     };
@@ -139,12 +139,12 @@ fn parser_with_separator<'a>(
                 let res = #res;
 
                 match splitted.next() {
-                    Some(d) => ::std::result::Result::Err(teloxide::utils::command::ParseError::TooManyArguments {
+                    Some(d) if !s.is_empty() => ::std::result::Result::Err(teloxide::utils::command::ParseError::TooManyArguments {
                         expected: #expected,
                         found: #expected + 1,
                         message: format!("Excess argument: {}", d),
                     }),
-                    None => ::std::result::Result::Ok(res)
+                    _ => ::std::result::Result::Ok(res)
                 }
             }
         )

crates/teloxide/tests/command.rs

@@ -117,7 +117,7 @@ fn parse_with_split() {
 
     assert_eq!(
         DefaultCommands::Start(10, "hello".to_string()),
-        DefaultCommands::parse("/start 10 hello", "").unwrap()
+        DefaultCommands::parse("/start 10 hello", "").unwrap(),
     );
 }
 
@@ -138,6 +138,34 @@ fn parse_with_split2() {
     );
 }
 
+#[test]
+#[cfg(feature = "macros")]
+fn parse_with_split3() {
+    #[derive(BotCommands, Debug, PartialEq)]
+    #[command(rename_rule = "lowercase")]
+    #[command(parse_with = "split")]
+    enum DefaultCommands {
+        Start(u8),
+        Help,
+    }
+
+    assert_eq!(DefaultCommands::Start(10), DefaultCommands::parse("/start 10", "").unwrap(),);
+}
+
+#[test]
+#[cfg(feature = "macros")]
+fn parse_with_split4() {
+    #[derive(BotCommands, Debug, PartialEq)]
+    #[command(rename_rule = "lowercase")]
+    #[command(parse_with = "split")]
+    enum DefaultCommands {
+        Start(),
+        Help,
+    }
+
+    assert_eq!(DefaultCommands::Start(), DefaultCommands::parse("/start", "").unwrap(),);
+}
+
 #[test]
 #[cfg(feature = "macros")]
 fn parse_custom_parser() {