/* Copyright (C) 2013 Phillip Susi
 *
 *  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; if not, see <http://www.gnu.org/licenses/>.
 */

#ifndef GPARTED_PIPECAPTURE_H
#define GPARTED_PIPECAPTURE_H

#include <string>
#include <vector>
#include <stddef.h>            // typedef size_t
#include <glib.h>              // typedef gunichar
#include <glibmm/ustring.h>
#include <glibmm/refptr.h>
#include <glibmm/iochannel.h>
#include <sigc++/signal.h>


namespace GParted
{


// captures output pipe of subprocess into a ustring and emits a signal on eof
class PipeCapture
{
public:
	PipeCapture( int fd, Glib::ustring &buffer );

	void connect_signal();
	sigc::signal<void> signal_eof;
	sigc::signal<void> signal_update;

private:
	bool OnReadable( Glib::IOCondition condition );
	static gboolean _OnReadable( GIOChannel *source,
	                             GIOCondition condition,
	                             gpointer data );

	Glib::RefPtr<Glib::IOChannel> m_channel;             // Wrapper around fd
	std::vector<char>             m_readbuf;             // Bytes read from IOChannel (fd)
	size_t                        m_fill_offset;         // Filling offset into m_readbuf
	std::vector<gunichar>         m_linevec;             // Current line stored as UCS-4 characters
	size_t                        m_cursor;              // Cursor position index into m_linevec
	std::string                   m_capturebuf;          // Captured output as UTF-8 characters
	size_t                        m_line_start;          // Index into m_capturebuf where current line starts
	Glib::ustring&                m_callerbuf;           // Reference to caller supplied buffer
	bool                          m_callerbuf_uptodate;  // Has m_capturebuf changed since last copied to m_callerbuf?
};


}  // namespace GParted


#endif /* GPARTED_PIPECAPTURE_H */
