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diff --git a/cli/cmd_config.cpp b/cli/cmd_config.cpp
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+// Copyright 2011 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.
+
+#include "cli/cmd_config.hpp"
+
+#include <cstdlib>
+
+#include "cli/common.ipp"
+#include "utils/cmdline/parser.ipp"
+#include "utils/cmdline/ui.hpp"
+#include "utils/config/tree.ipp"
+#include "utils/format/macros.hpp"
+
+namespace cmdline = utils::cmdline;
+namespace config = utils::config;
+
+using cli::cmd_config;
+
+
+namespace {
+
+
+/// Prints all configuration variables.
+///
+/// \param ui Object to interact with the I/O of the program.
+/// \param properties The key/value map representing all the configuration
+/// variables.
+///
+/// \return 0 for success.
+static int
+print_all(cmdline::ui* ui, const config::properties_map& properties)
+{
+ for (config::properties_map::const_iterator iter = properties.begin();
+ iter != properties.end(); iter++)
+ ui->out(F("%s = %s") % (*iter).first % (*iter).second);
+ return EXIT_SUCCESS;
+}
+
+
+/// Prints the configuration variables that the user requests.
+///
+/// \param ui Object to interact with the I/O of the program.
+/// \param properties The key/value map representing all the configuration
+/// variables.
+/// \param filters The names of the configuration variables to print.
+///
+/// \return 0 if all specified filters are valid; 1 otherwise.
+static int
+print_some(cmdline::ui* ui, const config::properties_map& properties,
+ const cmdline::args_vector& filters)
+{
+ bool ok = true;
+
+ for (cmdline::args_vector::const_iterator iter = filters.begin();
+ iter != filters.end(); iter++) {
+ const config::properties_map::const_iterator match =
+ properties.find(*iter);
+ if (match == properties.end()) {
+ cmdline::print_warning(ui, F("'%s' is not defined.") % *iter);
+ ok = false;
+ } else
+ ui->out(F("%s = %s") % (*match).first % (*match).second);
+ }
+
+ return ok ? EXIT_SUCCESS : EXIT_FAILURE;
+}
+
+
+} // anonymous namespace
+
+
+/// Default constructor for cmd_config.
+cmd_config::cmd_config(void) : cli_command(
+ "config", "[variable1 .. variableN]", 0, -1,
+ "Inspects the values of configuration variables")
+{
+}
+
+
+/// Entry point for the "config" subcommand.
+///
+/// \param ui Object to interact with the I/O of the program.
+/// \param cmdline Representation of the command line to the subcommand.
+/// \param user_config The runtime configuration of the program.
+///
+/// \return 0 if everything is OK, 1 if any of the necessary documents cannot be
+/// opened.
+int
+cmd_config::run(cmdline::ui* ui, const cmdline::parsed_cmdline& cmdline,
+ const config::tree& user_config)
+{
+ const config::properties_map properties = user_config.all_properties();
+ if (cmdline.arguments().empty())
+ return print_all(ui, properties);
+ else
+ return print_some(ui, properties, cmdline.arguments());
+}