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diff --git a/src/line_printer.h b/src/line_printer.h
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+// Copyright 2013 Google Inc. All Rights Reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef NINJA_LINE_PRINTER_H_
+#define NINJA_LINE_PRINTER_H_
+
+#include <string>
+using namespace std;
+
+/// Prints lines of text, possibly overprinting previously printed lines
+/// if the terminal supports it.
+class LinePrinter {
+ public:
+  LinePrinter();
+
+  bool is_smart_terminal() const { return smart_terminal_; }
+  void set_smart_terminal(bool smart) { smart_terminal_ = smart; }
+
+  enum LineType {
+    FULL,
+    ELIDE
+  };
+  /// Overprints the current line. If type is ELIDE, elides to_print to fit on
+  /// one line.
+  void Print(string to_print, LineType type);
+
+  /// Prints a string on a new line, not overprinting previous output.
+  void PrintOnNewLine(const string& to_print);
+
+ private:
+  /// Whether we can do fancy terminal control codes.
+  bool smart_terminal_;
+
+  /// Whether the caret is at the beginning of a blank line.
+  bool have_blank_line_;
+
+#ifdef _WIN32
+  void* console_;
+#endif
+};
+
+#endif  // NINJA_LINE_PRINTER_H_