fix for

Closes: zed-industries#18509

crates/language/src/language.rs

@@ -642,6 +642,9 @@ pub struct LanguageConfig {
     /// languages, but should not appear to the user as a distinct language.
     #[serde(default)]
     pub hidden: bool,
+    /// Insert trailing commas within blocks, like { } in JSON/JSONC
+    #[serde(default)]
+    pub insert_trailing_commas: bool,
 }
 
 #[derive(Clone, Debug, Serialize, Deserialize, Default, JsonSchema)]
@@ -729,6 +732,7 @@ impl Default for LanguageConfig {
             soft_wrap: None,
             prettier_parser_name: None,
             hidden: false,
+            insert_trailing_commas: false,
         }
     }
 }
@@ -1525,6 +1529,10 @@ impl LanguageScope {
         let override_config = grammar.override_config.as_ref()?;
         override_config.values.get(&id).map(|e| &e.1)
     }
+
+    pub fn insert_trailing_commas(&self) -> bool {
+        self.language.config.insert_trailing_commas
+    }
 }
 
 impl Hash for Language {

crates/languages/src/json/config.toml

@@ -10,3 +10,4 @@ brackets = [
 ]
 tab_size = 2
 prettier_parser_name = "json"
+insert_trailing_commas = true

crates/languages/src/jsonc/config.toml

@@ -10,3 +10,4 @@ brackets = [
 ]
 tab_size = 2
 prettier_parser_name = "jsonc"
+insert_trailing_commas = true

crates/vim/src/normal.rs

@@ -374,9 +374,37 @@ impl Vim {
                             .collect::<String>();
 
                         let end_of_line = Point::new(row, snapshot.line_len(MultiBufferRow(row)));
-                        (end_of_line..end_of_line, "\n".to_string() + &indent)
+                        let last_char_point = Point::new(
+                            row,
+                            snapshot.line_len(MultiBufferRow(row)).saturating_sub(1),
+                        );
+                        let inside_brackets = snapshot
+                            .enclosing_bracket_ranges(end_of_line..end_of_line)
+                            .into_iter()
+                            .flatten()
+                            .next()
+                            .is_some();
+                        let last_char = snapshot
+                            .text_for_range(last_char_point..end_of_line)
+                            .next()
+                            .unwrap_or_default();
+                        let mut edit = String::with_capacity(indent.len() + 2);
+
+                        let insert_trailing_commas = snapshot
+                            .language_scope_at(Point::new(row, 0))
+                            .map(|s| s.insert_trailing_commas())
+                            .unwrap_or_default();
+                        dbg!(insert_trailing_commas);
+                        let should_insert_trailing = !["{", ",", " ", "", "["].contains(&last_char);
+                        if should_insert_trailing && inside_brackets && insert_trailing_commas {
+                            edit.push(',');
+                        }
+                        edit.push('\n');
+                        edit.push_str(&indent);
+                        (end_of_line..end_of_line, edit)
                     })
                     .collect::<Vec<_>>();
+
                 editor.change_selections(Some(Autoscroll::fit()), cx, |s| {
                     s.maybe_move_cursors_with(|map, cursor, goal| {
                         Motion::CurrentLine.move_point(