1 files changed, 61 insertions, 0 deletions
diff --git a/src/cmd/fix/printerconfig.go b/src/cmd/fix/printerconfig.go
new file mode 100644
index 0000000..6d93996
--- /dev/null
+++ b/src/cmd/fix/printerconfig.go
@@ -0,0 +1,61 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package main
+
+import "go/ast"
+
+func init() {
+	register(printerconfigFix)
+}
+
+var printerconfigFix = fix{
+	name: "printerconfig",
+	date: "2012-12-11",
+	f:    printerconfig,
+	desc: `Add element keys to Config composite literals.`,
+}
+
+func printerconfig(f *ast.File) bool {
+	if !imports(f, "go/printer") {
+		return false
+	}
+
+	fixed := false
+	walk(f, func(n interface{}) {
+		cl, ok := n.(*ast.CompositeLit)
+		if !ok {
+			return
+		}
+		se, ok := cl.Type.(*ast.SelectorExpr)
+		if !ok {
+			return
+		}
+		if !isTopName(se.X, "printer") || se.Sel == nil {
+			return
+		}
+
+		if ss := se.Sel.String(); ss == "Config" {
+			for i, e := range cl.Elts {
+				if _, ok := e.(*ast.KeyValueExpr); ok {
+					break
+				}
+				switch i {
+				case 0:
+					cl.Elts[i] = &ast.KeyValueExpr{
+						Key:   ast.NewIdent("Mode"),
+						Value: e,
+					}
+				case 1:
+					cl.Elts[i] = &ast.KeyValueExpr{
+						Key:   ast.NewIdent("Tabwidth"),
+						Value: e,
+					}
+				}
+				fixed = true
+			}
+		}
+	})
+	return fixed
+}