From 3f4f2eed604c5c8ffd0ff617891a7b8e926fed6b Mon Sep 17 00:00:00 2001
From: kek kek kek <andriy.n@obox.systems>
Date: Tue, 24 Oct 2023 08:24:46 -0700
Subject: [PATCH] chore: fix empty constructor formatting (#3265)

---
 tooling/nargo_fmt/src/visitor.rs        | 10 +++++++---
 tooling/nargo_fmt/src/visitor/expr.rs   |  6 ++++--
 tooling/nargo_fmt/tests/expected/let.nr |  7 +++++++
 tooling/nargo_fmt/tests/input/let.nr    |  7 +++++++
 4 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/tooling/nargo_fmt/src/visitor.rs b/tooling/nargo_fmt/src/visitor.rs
index d1c87d311e7..bc769e3f298 100644
--- a/tooling/nargo_fmt/src/visitor.rs
+++ b/tooling/nargo_fmt/src/visitor.rs
@@ -4,7 +4,10 @@ mod stmt;
 
 use noirc_frontend::{hir::resolution::errors::Span, token::Token};
 
-use crate::{config::Config, utils::FindToken};
+use crate::{
+    config::Config,
+    utils::{self, FindToken},
+};
 
 pub(crate) struct FmtVisitor<'me> {
     config: &'me Config,
@@ -76,9 +79,10 @@ impl<'me> FmtVisitor<'me> {
     }
 
     #[track_caller]
-    fn push_rewrite(&mut self, s: String, span: Span) {
+    fn push_rewrite(&mut self, rewrite: String, span: Span) {
+        let rewrite = utils::recover_comment_removed(self.slice(span), rewrite);
         self.format_missing_indent(span.start(), true);
-        self.push_str(&s);
+        self.push_str(&rewrite);
     }
 
     fn format_missing(&mut self, end: u32) {
diff --git a/tooling/nargo_fmt/src/visitor/expr.rs b/tooling/nargo_fmt/src/visitor/expr.rs
index dcf4dbbd3b1..66d586888a6 100644
--- a/tooling/nargo_fmt/src/visitor/expr.rs
+++ b/tooling/nargo_fmt/src/visitor/expr.rs
@@ -15,7 +15,6 @@ impl FmtVisitor<'_> {
         let span = expr.span;
 
         let rewrite = self.format_expr(expr, expr_type);
-        let rewrite = utils::recover_comment_removed(self.slice(span), rewrite);
         self.push_rewrite(rewrite, span);
 
         self.last_position = span.end();
@@ -174,7 +173,7 @@ impl FmtVisitor<'_> {
                 }
             }
             ExpressionKind::Constructor(constructor) => {
-                let type_name = self.slice(constructor.type_name.span());
+                let type_name = self.slice(span.start()..constructor.type_name.span().end());
                 let fields_span = self
                     .span_before(constructor.type_name.span().end()..span.end(), Token::LeftBrace);
 
@@ -248,6 +247,7 @@ impl FmtVisitor<'_> {
     ) -> String {
         let fields = {
             let mut visitor = self.fork();
+            let is_unit_struct = constructor.fields.is_empty();
 
             visitor.indent.block_indent(visitor.config);
 
@@ -270,6 +270,8 @@ impl FmtVisitor<'_> {
                     nested_indent.indent.to_string_with_newline(),
                     visitor.shape().indent.to_string_with_newline()
                 )
+            } else if is_unit_struct {
+                exprs
             } else {
                 format!(" {exprs} ")
             }
diff --git a/tooling/nargo_fmt/tests/expected/let.nr b/tooling/nargo_fmt/tests/expected/let.nr
index c53f43c7e65..dccdb76328c 100644
--- a/tooling/nargo_fmt/tests/expected/let.nr
+++ b/tooling/nargo_fmt/tests/expected/let.nr
@@ -48,4 +48,11 @@ fn let_() {
     };
 
     let expr = Expr { /*A boolean literal (true, false).*/ kind: ExprKind::Bool(true) };
+
+    let mut V = dep::crate2::MyStruct { Q: x };
+    let mut V = dep::crate2::MyStruct {};
+    let mut V = dep::crate2::MyStruct {/*test*/};
+    let mut V = dep::crate2::MyStruct {
+        // sad
+    };
 }
diff --git a/tooling/nargo_fmt/tests/input/let.nr b/tooling/nargo_fmt/tests/input/let.nr
index c603d44a4ad..ae23f0150d9 100644
--- a/tooling/nargo_fmt/tests/input/let.nr
+++ b/tooling/nargo_fmt/tests/input/let.nr
@@ -24,4 +24,11 @@ kind: ExprKind::Bool(true),
     };
 
     let expr = Expr {/*A boolean literal (true, false).*/kind: ExprKind::Bool(true),};
+
+    let mut V = dep::crate2::MyStruct { Q: x };
+    let mut V = dep::crate2::MyStruct {};
+    let mut V = dep::crate2::MyStruct {/*test*/};
+    let mut V = dep::crate2::MyStruct {
+        // sad
+    };
 }