1 // Copyright 2013 Google Inc. All Rights Reserved.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 //     http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 #ifndef NINJA_LINE_PRINTER_H_
16 #define NINJA_LINE_PRINTER_H_
17 
18 #include <stddef.h>
19 #include <string>
20 
21 /// Prints lines of text, possibly overprinting previously printed lines
22 /// if the terminal supports it.
23 struct LinePrinter {
24   LinePrinter();
25 
is_smart_terminalLinePrinter26   bool is_smart_terminal() const { return smart_terminal_; }
set_smart_terminalLinePrinter27   void set_smart_terminal(bool smart) { smart_terminal_ = smart; }
28 
29   enum LineType { INFO, WARNING, ERROR };
30 
31   /// Outputs the given line. INFO output will be overwritten.
32   /// WARNING and ERROR appear on a line to themselves.
33   void Print(std::string to_print, LineType type);
34 
35   /// If there's an INFO line, keep it. If not, do nothing.
36   void KeepInfoLine();
37 
38  private:
39   /// Whether we can do fancy terminal control codes.
40   bool smart_terminal_;
41 
42   /// Whether the caret is at the beginning of a blank line.
43   bool have_blank_line_;
44 
45 #ifdef _WIN32
46   void* console_;
47 #endif
48 };
49 
50 #endif  // NINJA_LINE_PRINTER_H_
51