fix paren formatting

fixtures/small/paren_expr_calls_expected.rb

@@ -1,20 +1,20 @@
-a((1))
-other_cool_method((a + b).round(4))
+a(1)
+other_cool_method(a + b.round(4))
 
 # rubocop:disable PrisonGuard/PrivateModule
-(foo(
+foo(
   # rubocop:enable PrisonGuard/PrivateModule
   foo
-))
+)
   .flatten
 
 # rubocop:disable Style/Stuff
-(MyModel::InSomeNamespace
+MyModel::InSomeNamespace
   .load_one(
     # rubocop:enable Style/Stuff
     {name: "name"}
   )
-  &.rules)
+  &.rules
   .freeze
 
 beekeep((the_bees unless not_the_bees!))

librubyfmt/src/format_prism.rs

@@ -2893,7 +2893,23 @@
 }
 
 fn format_parentheses_node(ps: &mut ParserState, parentheses_node: prism::ParenthesesNode) {
-    ps.emit_open_paren();
+    let mut want_parens = true;
+    if let Some(body) = parentheses_node.body() {
+        if let Some(statements_node) = body.as_statements_node() {
+            if statements_node.body().len() == 1 {
+                let the_node = statements_node.body().iter().next().unwrap();
+                if !(the_node.as_unless_node().is_some() || the_node.as_if_node().is_some()) {
+                    want_parens = false;
+                }
+                if the_node.as_range_node().is_some() {
+                    want_parens = true;
+                }
+            }
+        }
+    }
+    if want_parens {
+        ps.emit_open_paren();
+    }
 
     let is_multiline = if let Some(body) = parentheses_node.body() {
         if let Some(statements_node) = body.as_statements_node() {
@@ -2935,8 +2951,9 @@
 
     if is_multiline {
         ps.emit_indent();
-        ps.emit_close_paren();
-    } else {
+    }
+
+    if want_parens {
         ps.emit_close_paren();
     }
 }