Fix struct overflows

src/expr.rs

@@ -1057,7 +1057,7 @@ fn rewrite_struct_lit<'a>(context: &RewriteContext,
     let path_str = try_opt!(path.rewrite(context, path_budget, offset));
 
     // Foo { a: Foo } - indent is +3, width is -5.
-    let h_budget = try_opt!(width.checked_sub(path_str.len() + 5));
+    let h_budget = width.checked_sub(path_str.len() + 5).unwrap_or(0);
     let (indent, v_budget) = match context.config.struct_lit_style {
         StructLitStyle::Visual => {
             (offset + path_str.len() + 3, h_budget)
@@ -1103,16 +1103,16 @@ fn rewrite_struct_lit<'a>(context: &RewriteContext,
                              |item| {
                                  match *item {
                                      StructLitField::Regular(ref field) => {
-                                         rewrite_field(inner_context, &field, h_budget, indent)
+                                         rewrite_field(inner_context, &field, v_budget, indent)
                                              .unwrap_or(context.snippet(field.span))
                                      }
                                      StructLitField::Base(ref expr) => {
                                          // 2 = ..
                                          format!("..{}",
-                                                 h_budget.checked_sub(2)
-                                                         .and_then(|h_budget| {
+                                                 v_budget.checked_sub(2)
+                                                         .and_then(|v_budget| {
                                                              expr.rewrite(inner_context,
-                                                                          h_budget,
+                                                                          v_budget,
                                                                           indent + 2)
                                                          })
                                                          .unwrap_or(context.snippet(expr.span)))
@@ -1122,11 +1122,13 @@ fn rewrite_struct_lit<'a>(context: &RewriteContext,
                              span_after(span, "{", context.codemap),
                              span.hi);
 
+    let tactic = match (context.config.struct_lit_style, fields.len()) {
+        (StructLitStyle::Visual, 1) => ListTactic::HorizontalVertical,
+        _ => context.config.struct_lit_multiline_style.to_list_tactic(),
+    };
+
     let fmt = ListFormatting {
-        tactic: match (context.config.struct_lit_style, fields.len()) {
-            (StructLitStyle::Visual, 1) => ListTactic::HorizontalVertical,
-            _ => context.config.struct_lit_multiline_style.to_list_tactic(),
-        },
+        tactic: tactic,
         separator: ",",
         trailing_separator: if base.is_some() {
             SeparatorTactic::Never
@@ -1150,7 +1152,8 @@ fn rewrite_struct_lit<'a>(context: &RewriteContext,
     };
 
     match (context.config.struct_lit_style, context.config.struct_lit_multiline_style) {
-        (StructLitStyle::Block, _) if fields_str.contains('\n') => format_on_newline(),
+        (StructLitStyle::Block, _) if fields_str.contains('\n') || fields_str.len() > h_budget =>
+            format_on_newline(),
         (StructLitStyle::Block, MultilineStyle::ForceMulti) => format_on_newline(),
         _ => Some(format!("{} {{ {} }}", path_str, fields_str)),
     }

tests/source/expr.rs

@@ -173,11 +173,3 @@ fn arrays() {
 
     [ 1 +   3, 4 ,  5, 6, 7, 7, fncall::<Vec<_>>(3-1)]
 }
-
-fn struct_exprs() {
-    Foo
-    { a :  1, b:f( 2)};
-    Foo{a:1,b:f(2),..g(3)};
-    // FIXME: should be wrapped (#231)
-    LoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooongStruct { ..base };
-}

tests/source/struct_lits.rs

@@ -83,3 +83,11 @@ fn issue278() {
         b: 0,
     };
 }
+
+fn struct_exprs() {
+    Foo
+    { a :  1, b:f( 2)};
+    Foo{a:1,b:f(2),..g(3)};
+    LoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooongStruct { ..base };
+    IntrinsicISizesContribution { content_intrinsic_sizes: IntrinsicISizes { minimum_inline_size: 0, }, };
+}

tests/target/expr.rs

@@ -183,10 +183,3 @@ fn arrays() {
 
     [1 + 3, 4, 5, 6, 7, 7, fncall::<Vec<_>>(3 - 1)]
 }
-
-fn struct_exprs() {
-    Foo { a: 1, b: f(2) };
-    Foo { a: 1, b: f(2), ..g(3) };
-    // FIXME: should be wrapped (#231)
-    LoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooongStruct { ..base };
-}

tests/target/struct_lits.rs

@@ -65,10 +65,7 @@ fn main() {
 
 fn matcher() {
     TagTerminatedByteMatcher {
-        matcher: ByteMatcher {
-            pattern: b"<HTML",
-            mask: b"\xFF\xDF\xDF\xDF\xDF\xFF",
-        },
+        matcher: ByteMatcher { pattern: b"<HTML", mask: b"\xFF\xDF\xDF\xDF\xDF\xFF" },
     };
 }
 
@@ -101,3 +98,14 @@ fn issue278() {
         b: 0,
     };
 }
+
+fn struct_exprs() {
+    Foo { a: 1, b: f(2) };
+    Foo { a: 1, b: f(2), ..g(3) };
+    LoooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooongStruct {
+        ..base
+    };
+    IntrinsicISizesContribution {
+        content_intrinsic_sizes: IntrinsicISizes { minimum_inline_size: 0 },
+    };
+}