Implement toggle-comments

crates/language/src/language.rs

@@ -14,6 +14,7 @@ pub struct LanguageConfig {
     pub name: String,
     pub path_suffixes: Vec<String>,
     pub brackets: Vec<BracketPair>,
+    pub line_comment: Option<String>,
     pub language_server: Option<LanguageServerConfig>,
 }
 
@@ -115,6 +116,10 @@ impl Language {
         self.config.name.as_str()
     }
 
+    pub fn line_comment_prefix(&self) -> Option<&str> {
+        self.config.line_comment.as_deref()
+    }
+
     pub fn start_server(
         &self,
         root_path: &Path,

crates/language/src/lib.rs

@@ -1654,11 +1654,6 @@ impl Snapshot {
         None
     }
 
-    fn is_line_blank(&self, row: u32) -> bool {
-        self.text_for_range(Point::new(row, 0)..Point::new(row, self.line_len(row)))
-            .all(|chunk| chunk.matches(|c: char| !c.is_whitespace()).next().is_none())
-    }
-
     pub fn chunks<'a, T: ToOffset>(
         &'a self,
         range: Range<T>,