Use offset_left for rewrite_unary_prefix

src/expr.rs

@@ -156,11 +156,7 @@ fn format_expr(expr: &ast::Expr,
             };
 
             if let Some(ref expr) = *opt_expr {
-                rewrite_unary_prefix(context,
-                                     &format!("break{} ", id_str),
-                                     &**expr,
-                                     shape,
-                                     expr.span)
+                rewrite_unary_prefix(context, &format!("break{} ", id_str), &**expr, shape)
             } else {
                 wrap_str(format!("break{}", id_str), context.config.max_width, shape)
             }
@@ -180,11 +176,9 @@ fn format_expr(expr: &ast::Expr,
         }
         ast::ExprKind::Ret(None) => wrap_str("return".to_owned(), context.config.max_width, shape),
         ast::ExprKind::Ret(Some(ref expr)) => {
-            rewrite_unary_prefix(context, "return ", &**expr, shape, expr.span)
-        }
-        ast::ExprKind::Box(ref expr) => {
-            rewrite_unary_prefix(context, "box ", &**expr, shape, expr.span)
+            rewrite_unary_prefix(context, "return ", &**expr, shape)
         }
+        ast::ExprKind::Box(ref expr) => rewrite_unary_prefix(context, "box ", &**expr, shape),
         ast::ExprKind::AddrOf(mutability, ref expr) => {
             rewrite_expr_addrof(context, mutability, expr, shape)
         }
@@ -226,7 +220,7 @@ fn format_expr(expr: &ast::Expr,
                     } else {
                         delim.into()
                     };
-                    rewrite_unary_prefix(context, &sp_delim, &**rhs, shape, expr.span)
+                    rewrite_unary_prefix(context, &sp_delim, &**rhs, shape)
                 }
                 (Some(ref lhs), None) => {
                     let sp_delim = if context.config.spaces_around_ranges {
@@ -1999,24 +1993,10 @@ pub fn rewrite_tuple<'a, I>(context: &RewriteContext,
 pub fn rewrite_unary_prefix<R: Rewrite>(context: &RewriteContext,
                                         prefix: &str,
                                         rewrite: &R,
-                                        mut shape: Shape,
-                                        span: Span)
+                                        shape: Shape)
                                         -> Option<String> {
-    // Heuristic: if unary is `&` and `rewrite` contains `{`,
-    // it is likely that block indent is preferred to visual indent.
-    if prefix == "&" {
-        let snippet = String::from(context.snippet(span).trim_left_matches('&'));
-        let first_line = try_opt!(snippet.lines().nth(0));
-        if first_line.contains("{") {
-            shape = try_opt!(shape.sub_width(prefix.len())).block_indent(0);
-        } else {
-            shape = try_opt!(shape.shrink_left(prefix.len())).visual_indent(0);
-        }
-    } else {
-        shape = try_opt!(shape.shrink_left(prefix.len())).visual_indent(0);
-    }
     rewrite
-        .rewrite(context, shape)
+        .rewrite(context, try_opt!(shape.offset_left(prefix.len())))
         .map(|r| format!("{}{}", prefix, r))
 }
 
@@ -2046,7 +2026,7 @@ fn rewrite_unary_op(context: &RewriteContext,
         ast::UnOp::Not => "!",
         ast::UnOp::Neg => "-",
     };
-    rewrite_unary_prefix(context, operator_str, expr, shape, expr.span)
+    rewrite_unary_prefix(context, operator_str, expr, shape)
 }
 
 fn rewrite_assignment(context: &RewriteContext,
@@ -2143,5 +2123,5 @@ fn rewrite_expr_addrof(context: &RewriteContext,
         ast::Mutability::Immutable => "&",
         ast::Mutability::Mutable => "&mut ",
     };
-    rewrite_unary_prefix(context, operator_str, expr, shape, expr.span)
+    rewrite_unary_prefix(context, operator_str, expr, shape)
 }

src/patterns.rs

@@ -28,9 +28,7 @@ use syntax::codemap::{self, BytePos, Span};
 impl Rewrite for Pat {
     fn rewrite(&self, context: &RewriteContext, shape: Shape) -> Option<String> {
         match self.node {
-            PatKind::Box(ref pat) => {
-                rewrite_unary_prefix(context, "box ", &**pat, shape, self.span)
-            }
+            PatKind::Box(ref pat) => rewrite_unary_prefix(context, "box ", &**pat, shape),
             PatKind::Ident(binding_mode, ident, ref sub_pat) => {
                 let (prefix, mutability) = match binding_mode {
                     BindingMode::ByRef(mutability) => ("ref ", mutability),
@@ -74,7 +72,7 @@ impl Rewrite for Pat {
             }
             PatKind::Ref(ref pat, mutability) => {
                 let prefix = format!("&{}", format_mutability(mutability));
-                rewrite_unary_prefix(context, &prefix, &**pat, shape, self.span)
+                rewrite_unary_prefix(context, &prefix, &**pat, shape)
             }
             PatKind::Tuple(ref items, dotdot_pos) => {
                 rewrite_tuple_pat(items, dotdot_pos, None, self.span, context, shape)

tests/source/macros.rs

@@ -79,3 +79,9 @@ gfx_pipeline!(pipe {
 fn issue_1279() {
     println!("dsfs"); // a comment
 }
+
+fn issue_1555() {
+    let hello = &format!("HTTP/1.1 200 OK\r\nServer: {}\r\n\r\n{}",
+                         "65454654654654654654654655464",
+                         "4");
+}

tests/target/macros.rs

@@ -80,3 +80,9 @@ gfx_pipeline!(pipe {
 fn issue_1279() {
     println!("dsfs"); // a comment
 }
+
+fn issue_1555() {
+    let hello = &format!("HTTP/1.1 200 OK\r\nServer: {}\r\n\r\n{}",
+                         "65454654654654654654654655464",
+                         "4");
+}