/*
* opencog/atoms/sensory-v0/TerminalStream.h
*
* Copyright (C) 2024 Linas Vepstas
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License v3 as
* published by the Free Software Foundation and including the exceptions
* at http://opencog.org/wiki/Licenses
*
* 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 Affero General Public License
* along with this program; if not, write to:
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _OPENCOG_TERMINAL_STREAM_H
#define _OPENCOG_TERMINAL_STREAM_H
#include <stdio.h>
#include <opencog/atoms/sensory-v0/OutputStream.h>
namespace opencog
{
/** \addtogroup grp_atomspace
* @{
*/
/**
* TerminalStreams provide a text stream connected to an instance of an
* xterm. Due to the general weirdness of attaching terminals to running
* processes, this is what it is because the alternative is to build a
* telnet sserver, and I don't want to do that.
*/
class TerminalStream
: public OutputStream
{
protected:
TerminalStream(Type t, const std::string&);
void init(void);
void halt(void) const;
virtual void update() const;
Handle _description;
void do_describe(void);
mutable FILE* _fh;
mutable pid_t _xterm_pid;
virtual void do_write(const std::string&);
public:
TerminalStream(void);
TerminalStream(const ValueSeq&);
virtual ~TerminalStream();
virtual ValuePtr describe(AtomSpace*, bool);
virtual ValuePtr write_out(AtomSpace*, bool, const Handle&);
};
typedef std::shared_ptr<TerminalStream> TerminalStreamPtr;
static inline TerminalStreamPtr TerminalStreamCast(ValuePtr& a)
{ return std::dynamic_pointer_cast<TerminalStream>(a); }
template<typename ... Type>
static inline std::shared_ptr<TerminalStream> createTerminalStream(Type&&... args) {
return std::make_shared<TerminalStream>(std::forward<Type>(args)...);
}
/** @}*/
} // namespace opencog
extern "C" {
void opencog_sensory_v0_terminal_init(void);
};
#endif // _OPENCOG_TERMINAL_STREAM_H