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diff --git a/model/context.cpp b/model/context.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 "model/context.hpp"
+
+#include "utils/format/macros.hpp"
+#include "utils/fs/path.hpp"
+#include "utils/noncopyable.hpp"
+#include "utils/text/operations.ipp"
+
+namespace fs = utils::fs;
+namespace text = utils::text;
+
+
+/// Internal implementation of a context.
+struct model::context::impl : utils::noncopyable {
+    /// The current working directory.
+    fs::path _cwd;
+
+    /// The environment variables.
+    std::map< std::string, std::string > _env;
+
+    /// Constructor.
+    ///
+    /// \param cwd_ The current working directory.
+    /// \param env_ The environment variables.
+    impl(const fs::path& cwd_,
+         const std::map< std::string, std::string >& env_) :
+        _cwd(cwd_),
+        _env(env_)
+    {
+    }
+
+    /// Equality comparator.
+    ///
+    /// \param other The object to compare to.
+    ///
+    /// \return True if the two objects are equal; false otherwise.
+    bool
+    operator==(const impl& other) const
+    {
+        return _cwd == other._cwd && _env == other._env;
+    }
+};
+
+
+/// Constructs a new context.
+///
+/// \param cwd_ The current working directory.
+/// \param env_ The environment variables.
+model::context::context(const fs::path& cwd_,
+                         const std::map< std::string, std::string >& env_) :
+    _pimpl(new impl(cwd_, env_))
+{
+}
+
+
+/// Destructor.
+model::context::~context(void)
+{
+}
+
+
+/// Returns the current working directory of the context.
+///
+/// \return A path.
+const fs::path&
+model::context::cwd(void) const
+{
+    return _pimpl->_cwd;
+}
+
+
+/// Returns the environment variables of the context.
+///
+/// \return A variable name to variable value mapping.
+const std::map< std::string, std::string >&
+model::context::env(void) const
+{
+    return _pimpl->_env;
+}
+
+
+/// Equality comparator.
+///
+/// \param other The other object to compare this one to.
+///
+/// \return True if this object and other are equal; false otherwise.
+bool
+model::context::operator==(const context& other) const
+{
+    return *_pimpl == *other._pimpl;
+}
+
+
+/// Inequality comparator.
+///
+/// \param other The other object to compare this one to.
+///
+/// \return True if this object and other are different; false otherwise.
+bool
+model::context::operator!=(const context& other) const
+{
+    return !(*this == other);
+}
+
+
+/// Injects the object into a stream.
+///
+/// \param output The stream into which to inject the object.
+/// \param object The object to format.
+///
+/// \return The output stream.
+std::ostream&
+model::operator<<(std::ostream& output, const context& object)
+{
+    output << F("context{cwd=%s, env=[")
+        % text::quote(object.cwd().str(), '\'');
+
+    const std::map< std::string, std::string >& env = object.env();
+    bool first = true;
+    for (std::map< std::string, std::string >::const_iterator
+             iter = env.begin(); iter != env.end(); ++iter) {
+        if (!first)
+            output << ", ";
+        first = false;
+
+        output << F("%s=%s") % (*iter).first
+            % text::quote((*iter).second, '\'');
+    }
+
+    output << "]}";
+    return output;
+}