chore: set up if

tooling/nargo_fmt/src/visitor/expr.rs

@@ -39,6 +39,20 @@ impl FmtVisitor<'_> {
                     self.format_expr(infix.rhs)
                 )
             }
+            ExpressionKind::If(if_expr) => {
+                let condition_str = self.format_expr(if_expr.condition);
+                let consequence_str = self.format_expr(if_expr.consequence);
+
+                if let Some(alternative_expr) = &if_expr.alternative {
+                    let alternative_str = self.format_expr(alternative_expr.clone());
+                    format!(
+                        "if {} {{\n    {}\n}} else {{\n    {}\n}}",
+                        condition_str, consequence_str, alternative_str
+                    )
+                } else {
+                    format!("if {} {{\n    {}\n}}", condition_str, consequence_str)
+                }
+            }
             ExpressionKind::MemberAccess(member_access_expr) => {
                 let lhs_str = self.format_expr(member_access_expr.lhs);
                 format!("{}.{}", lhs_str, member_access_expr.rhs)

tooling/nargo_fmt/tests/expected/if.nr

@@ -0,0 +1,11 @@
+fn main() {
+    if true {
+        println!("True branch");
+    }
+
+    if x > 5 {
+        println!("X is greater than 5");
+    } else {
+        println!("X is not greater than 5");
+    }
+}

tooling/nargo_fmt/tests/input/if.nr

@@ -0,0 +1,8 @@
+fn main() {
+    if true { println!("True branch");}
+
+    if x > 5 {println!("X is greater than 5");} else
+    {
+        println!("X is not greater than 5");
+    }
+}