Add initial prototype for the GN meta-buildsystem.

tools/gn/standard_out.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tools/gn/standard_out.h"
+
+#include "build/build_config.h"
+
+#if defined(OS_WIN)
+#include <windows.h>
+#else
+#include <stdio.h>
+#endif
+
+namespace {
+
+bool initialized = false;
+
+#if defined(OS_WIN)
+HANDLE hstdout;
+WORD default_attributes;
+
+bool is_console = false;
+#endif
+
+void EnsureInitialized() {
+  if (initialized)
+    return;
+  initialized = true;
+
+#if defined(OS_WIN)
+  hstdout = ::GetStdHandle(STD_OUTPUT_HANDLE);
+  CONSOLE_SCREEN_BUFFER_INFO info;
+  is_console = !!::GetConsoleScreenBufferInfo(hstdout, &info);
+  default_attributes = info.wAttributes;
+#endif
+}
+
+}  // namespace
+
+#if defined(OS_WIN)
+
+void OutputString(const std::string& output, TextDecoration dec) {
+  EnsureInitialized();
+  if (is_console) {
+    switch (dec) {
+      case DECORATION_NONE:
+        break;
+      case DECORATION_BOLD:
+        ::SetConsoleTextAttribute(hstdout, FOREGROUND_INTENSITY);
+        break;
+      case DECORATION_RED:
+        ::SetConsoleTextAttribute(hstdout,
+                                  FOREGROUND_RED | FOREGROUND_INTENSITY);
+        break;
+      case DECORATION_GREEN:
+        // Keep green non-bold.
+        ::SetConsoleTextAttribute(hstdout, FOREGROUND_GREEN);
+        break;
+      case DECORATION_BLUE:
+        ::SetConsoleTextAttribute(hstdout,
+                                  FOREGROUND_BLUE | FOREGROUND_INTENSITY);
+        break;
+      case DECORATION_YELLOW:
+        ::SetConsoleTextAttribute(hstdout,
+                                  FOREGROUND_RED | FOREGROUND_GREEN);
+        break;
+    }
+  }
+
+  DWORD written = 0;
+  ::WriteFile(hstdout, output.c_str(), output.size(), &written, NULL);
+
+  if (is_console)
+    ::SetConsoleTextAttribute(hstdout, default_attributes);
+}
+
+#else
+
+void OutputString(const std::string& output, TextDecoration dec) {
+  printf("%s", output.c_str());
+}
+
+#endif