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/** \file transient_message.cc */
// Copyright (C) 2010 Daniel Burrows
//
// This program 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 2 of the
// License, or (at your option) any later version.
//
// This program 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 this program; see the file COPYING. If not, write to
// the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
// Local includes:
#include "transient_message.h"
#include "cmdline_common.h"
#include "terminal.h"
// System includes:
#include <boost/make_shared.hpp>
#include <cwidget/generic/util/transcode.h>
#include <iostream>
using cwidget::util::transcode;
namespace aptitude
{
namespace cmdline
{
transient_message::~transient_message()
{
}
namespace
{
/** \brief Transient message implementation for non-terminal
* output.
*/
class dummy_transient_message : public transient_message
{
boost::shared_ptr<terminal_output> term_output;
public:
explicit dummy_transient_message(const boost::shared_ptr<terminal_output> &_term_output)
: term_output(_term_output)
{
}
void set_text(const std::wstring &msg)
{
}
void display_and_advance(const std::wstring &msg)
{
term_output->write_text(msg);
term_output->write_text(L"\n");
term_output->flush();
}
};
class transient_message_impl : public transient_message
{
// The length of the last line we displayed. Not
// last_line.size() because it counts character width, not
// bytes.
std::size_t last_line_len;
// The last string we displayed.
std::wstring last_line;
// The locale to be used with that terminal.
boost::shared_ptr<terminal_locale> term_locale;
// The dimensions of the terminal.
boost::shared_ptr<terminal_metrics> term_metrics;
// The terminal output object used to display this message.
boost::shared_ptr<terminal_output> term_output;
void clear_last_line();
public:
transient_message_impl(const boost::shared_ptr<terminal_locale> &_term_locale,
const boost::shared_ptr<terminal_metrics> &_term_metrics,
const boost::shared_ptr<terminal_output> &_term_output)
: last_line_len(0),
term_locale(_term_locale),
term_metrics(_term_metrics),
term_output(_term_output)
{
}
void set_text(const std::wstring &line);
void display_and_advance(const std::wstring &line);
};
void transient_message_impl::clear_last_line()
{
static const std::wstring blank(L" ");
term_output->move_to_beginning_of_line();
for(std::size_t i = 0; i < last_line_len; ++i)
term_output->write_text(blank);
term_output->move_to_beginning_of_line();
last_line_len = 0;
}
void transient_message_impl::set_text(const std::wstring &line)
{
if(last_line == line)
// Don't clutter the terminal stream if there's nothing to
// do.
return;
const unsigned int screen_width = term_metrics->get_screen_width();
// Display the message on a single line of the terminal.
//
// TODO: it would be nice to be able to properly wrap
// multi-line messages and then clean them up. Is it
// possible to do that in a sane way?
std::wstring::const_iterator display_end = line.begin();
unsigned int display_width = 0;
{
while(display_end != line.end() && display_width < screen_width)
{
const wchar_t next = *display_end;
const int next_width = term_locale->wcwidth(next);
if(next_width >= 0)
{
const unsigned int new_display_width =
display_width + static_cast<unsigned int>(next_width);
if(new_display_width > screen_width)
break;
display_width = new_display_width;
}
++display_end;
}
}
const std::wstring display(line.begin(), display_end);
clear_last_line();
term_output->write_text(display);
term_output->flush();
last_line_len = display_width;
last_line = line;
}
void transient_message_impl::display_and_advance(const std::wstring &msg)
{
clear_last_line();
term_output->write_text(msg);
term_output->write_text(L"\n");
last_line_len = 0;
last_line.clear();
}
}
boost::shared_ptr<transient_message>
create_transient_message(const boost::shared_ptr<terminal_locale> &term_locale,
const boost::shared_ptr<terminal_metrics> &term_metrics,
const boost::shared_ptr<terminal_output> &term_output)
{
if(!term_output->output_is_a_terminal())
return boost::make_shared<dummy_transient_message>(term_output);
else
return boost::make_shared<transient_message_impl>(term_locale, term_metrics, term_output);
}
}
}
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