util: Exposing IndentedStream class as part of public API

Change-Id: I2162a1c3e463f76e4192baf2eb618afd73082781
Refs: #2238
diff --git a/src/util/indented-stream.cpp b/src/util/indented-stream.cpp
new file mode 100644
index 0000000..04c04cd
--- /dev/null
+++ b/src/util/indented-stream.cpp
@@ -0,0 +1,68 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2014 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "indented-stream.hpp"
+
+#include <vector>
+
+#include <boost/range/iterator_range.hpp>
+#include <boost/algorithm/string/split.hpp>
+
+namespace ndn {
+namespace util {
+
+IndentedStream::IndentedStream(std::ostream& os, const std::string& indent)
+  : std::ostream(&m_buffer)
+  , m_buffer(os, indent)
+{
+}
+
+IndentedStream::~IndentedStream()
+{
+  flush();
+}
+
+IndentedStream::StreamBuf::StreamBuf(std::ostream& os, const std::string& indent)
+  : m_output(os)
+  , m_indent(indent)
+{
+}
+
+int
+IndentedStream::StreamBuf::sync()
+{
+  typedef boost::iterator_range<std::string::const_iterator> StringView;
+
+  const std::string& output = str();
+  std::vector<StringView> splitOutput;
+  boost::split(splitOutput, output, [] (char ch) { return ch == '\n'; });
+
+  if (!splitOutput.empty() && splitOutput.back().empty()) {
+    splitOutput.pop_back();
+  }
+  for (const StringView& line : splitOutput) {
+    m_output << m_indent << line << "\n";
+  }
+  return 0; // success
+}
+
+} // namespace util
+} // namespace ndn