chore: remove unnecessary format

src/lsp.rs

@@ -186,9 +186,10 @@ impl Backend {
                 .unwrap_or(0);
         let start_position = utils::offset_to_position(&rope, real_offset, encoding)?;
         let range = Range::new(start_position, position);
-        let filter_prefix = (self.config.read().await.long_filter_text).then_some(
-            utils::surrounding_word(&Cow::from(rope.slice(line_begin..real_offset))),
-        );
+        let filter_prefix = (self.config.read().await.long_filter_text).then_some({
+            let slice = &Cow::from(rope.slice(line_begin..real_offset));
+            utils::surrounding_word(slice).to_string()
+        });
         // TODO: Does compiler know the right time to drop the lock,
         // or it will wait until the end of this function?
         drop(rope);
@@ -241,7 +242,9 @@ impl Backend {
                 _ => text.clone(),
             };
             if show_filter_text_in_label {
-                label += &format!(" ({})", filter_text);
+                label.push_str(" (");
+                label.push_str(&filter_text);
+                label.push(')');
             }
             let label_details = (!c.comment.is_empty()).then_some(CompletionItemLabelDetails {
                 detail: Some(c.comment.clone()),
@@ -301,7 +304,7 @@ impl LanguageServer for Backend {
             triggers.extend_from_slice(user_triggers);
             triggers
         };
-
+        // negotiate position encoding
         let encoding_options = params
             .capabilities
             .general
@@ -420,8 +423,11 @@ impl LanguageServer for Backend {
                 self.notify_work_begin(token.clone(), command).await;
                 let mut config = self.config.write().await;
                 config.enabled = !config.enabled;
-                let status = format!("Rime is {}", if config.enabled { "ON" } else { "OFF" });
-                self.notify_work_done(token.clone(), &status).await;
+                let status = match config.enabled {
+                    true => "Rime is ON",
+                    false => "Rime is OFF",
+                };
+                self.notify_work_done(token.clone(), status).await;
                 // return a bool representing if rime-ls is enabled
                 return Ok(Some(Value::from(config.enabled)));
             }

src/utils.rs

@@ -44,7 +44,6 @@ pub fn position_to_offset(rope: &Rope, position: Position, encoding: Encoding) -
             Encoding::UTF16 => rope.line(line).try_utf16_cu_to_char(col).ok()?,
             Encoding::UTF32 => col,
         };
-        //let col8 = rope.line(line).try_utf16_cu_to_char(col).ok()?;
         let offset = rope.try_line_to_char(line).ok()? + col_offset;
         Some(offset)
     })
@@ -135,26 +134,28 @@ fn char_is_word(ch: char) -> bool {
     ch.is_alphanumeric() || ch == '_'
 }
 
-pub fn surrounding_word(s: &str) -> String {
+#[inline]
+pub fn surrounding_word(s: &str) -> &str {
     let end = s.len();
     let mut start = end;
+
     for ch in s.chars().rev() {
         if char_is_word(ch) {
             start -= ch.len_utf8();
         } else {
             break;
         }
     }
-    s[start..end].to_string()
+    &s[start..end]
 }
 
 #[test]
 fn test_surrounding_word() {
-    assert_eq!(surrounding_word(""), "".to_string());
-    assert_eq!(surrounding_word(" "), "".to_string());
-    assert_eq!(surrounding_word("hello_world"), "hello_world".to_string());
-    assert_eq!(surrounding_word("hello world"), "world".to_string());
-    assert_eq!(surrounding_word("汉字nihao"), "汉字nihao".to_string());
-    assert_eq!(surrounding_word("汉，字nihao"), "字nihao".to_string());
-    assert_eq!(surrounding_word("汉。字nihao"), "字nihao".to_string());
+    assert_eq!(surrounding_word(""), "");
+    assert_eq!(surrounding_word(" "), "");
+    assert_eq!(surrounding_word("hello_world"), "hello_world");
+    assert_eq!(surrounding_word("hello world"), "world");
+    assert_eq!(surrounding_word("汉字nihao"), "汉字nihao");
+    assert_eq!(surrounding_word("汉，字nihao"), "字nihao");
+    assert_eq!(surrounding_word("汉。字nihao"), "字nihao");
 }