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diff --git a/utils/cmdline/ui.hpp b/utils/cmdline/ui.hpp
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+// Copyright 2010 The Kyua Authors.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+//   notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above copyright
+//   notice, this list of conditions and the following disclaimer in the
+//   documentation and/or other materials provided with the distribution.
+// * Neither the name of Google Inc. nor the names of its contributors
+//   may be used to endorse or promote products derived from this software
+//   without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+/// \file utils/cmdline/ui.hpp
+/// Abstractions and utilities to write formatted messages to the console.
+
+#if !defined(UTILS_CMDLINE_UI_HPP)
+#define UTILS_CMDLINE_UI_HPP
+
+#include "utils/cmdline/ui_fwd.hpp"
+
+#include <cstddef>
+#include <string>
+
+#include "utils/optional_fwd.hpp"
+#include "utils/text/table_fwd.hpp"
+
+namespace utils {
+namespace cmdline {
+
+
+/// Interface to interact with the CLI.
+///
+/// The main purpose of this class is to substitute direct usages of stdout and
+/// stderr.  An instance of this class is passed to every command of a CLI,
+/// which allows unit testing and validation of the interaction with the user.
+///
+/// This class writes directly to stdout and stderr.  For testing purposes, see
+/// the utils::cmdline::ui_mock class.
+class ui {
+public:
+    virtual ~ui(void);
+
+    virtual void err(const std::string&, const bool = true);
+    virtual void out(const std::string&, const bool = true);
+    virtual optional< std::size_t > screen_width(void) const;
+
+    void out_wrap(const std::string&);
+    void out_tag_wrap(const std::string&, const std::string&,
+                      const bool = true);
+    void out_table(const utils::text::table&, utils::text::table_formatter,
+                   const std::string&);
+};
+
+
+void print_error(ui*, const std::string&);
+void print_info(ui*, const std::string&);
+void print_warning(ui*, const std::string&);
+
+
+}  // namespace cmdline
+}  // namespace utils
+
+#endif  // !defined(UTILS_CMDLINE_UI_HPP)