tools: implement 'nfdc cs info' command

refs #4219

Change-Id: I4252878943c3f6c88f306f83f5023fffc82326b0
diff --git a/tools/nfdc/cs-module.cpp b/tools/nfdc/cs-module.cpp
new file mode 100644
index 0000000..975fd99
--- /dev/null
+++ b/tools/nfdc/cs-module.cpp
@@ -0,0 +1,69 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/*
+ * Copyright (c) 2014-2018,  Regents of the University of California,
+ *                           Arizona Board of Regents,
+ *                           Colorado State University,
+ *                           University Pierre & Marie Curie, Sorbonne University,
+ *                           Washington University in St. Louis,
+ *                           Beijing Institute of Technology,
+ *                           The University of Memphis.
+ *
+ * This file is part of NFD (Named Data Networking Forwarding Daemon).
+ * See AUTHORS.md for complete list of NFD authors and contributors.
+ *
+ * NFD is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * NFD 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * NFD, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "cs-module.hpp"
+#include "format-helpers.hpp"
+
+namespace nfd {
+namespace tools {
+namespace nfdc {
+
+void
+CsModule::fetchStatus(Controller& controller,
+                      const function<void()>& onSuccess,
+                      const Controller::DatasetFailCallback& onFailure,
+                      const CommandOptions& options)
+{
+  controller.fetch<ndn::nfd::CsInfoDataset>(
+    [this, onSuccess] (const CsInfo& result) {
+      m_status = result;
+      onSuccess();
+    },
+    onFailure, options);
+}
+
+void
+CsModule::formatStatusXml(std::ostream& os) const
+{
+  os << "<cs>";
+  os << "<nHits>" << m_status.getNHits() << "</nHits>";
+  os << "<nMisses>" << m_status.getNMisses() << "</nMisses>";
+  os << "</cs>";
+}
+
+void
+CsModule::formatStatusText(std::ostream& os) const
+{
+  os << "CS information:\n  ";
+  text::ItemAttributes ia;
+  os << ia("nHits") << m_status.getNHits()
+     << ia("nMisses") << m_status.getNMisses()
+     << ia.end();
+  os << '\n';
+}
+
+} // namespace nfdc
+} // namespace tools
+} // namespace nfd