simplify logic

src/rules.rs

@@ -26,26 +26,24 @@ impl Rules {
     /// Reload rule set by alias from it source
     /// * `None` to reload all
     pub async fn reload(&mut self, list_alias: Option<&str>) -> Result<Vec<String>> {
-        let mut affected = Vec::with_capacity(if list_alias.is_some() {
-            1
-        } else {
-            self.0.len()
-        });
-        match list_alias {
+        Ok(match list_alias {
             Some(alias) => {
+                let mut affected = Vec::with_capacity(1);
                 if let Some(list) = self.0.get_mut(alias) {
                     list.reload().await?;
                     affected.push(alias.into());
                 }
+                affected
             }
             None => {
+                let mut affected = Vec::with_capacity(self.0.len());
                 for (alias, list) in self.0.iter_mut() {
                     list.reload().await?;
                     affected.push(alias.into());
                 }
+                affected
             }
-        }
-        Ok(affected)
+        })
     }
     /// Check if rule is exist in the index
     pub fn any(&self, value: &str) -> bool {