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//
// aegis - project change supervisor
// Copyright (C) 1992-2006, 2008, 2011, 2012 Peter Miller
//
// 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 3 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 OUTPUT_PAGER_H
#define OUTPUT_PAGER_H

#include <common/nstring.h>
#include <libaegis/output.h>

class output_pager:
    public output
{
public:
    virtual ~output_pager();

private:
    output_pager();

public:
    static void set(int flag, void(*usage)(void));

    static pointer open(void);

    static void cleanup(void);

protected:
    // See base class for documentation.
    nstring filename(void) const;

    // See base class for documentation.
    nstring type_name(void) const;

    // See base class for documentation.
    long ftell_inner(void) const;

    // See base class for documentation.
    void write_inner(const void *data, size_t length);

    // See base class for documentation.
    void end_of_line_inner(void);

    // See base class for documentation.
    void flush_inner(void);

private:
    void *vdeeper;
    int pid;
    nstring pager;
    bool bol;

    void pipe_open(void);
    void pager_error(void);

    output_pager(const output_pager &);

    output_pager &operator=(const output_pager &);
};

void option_pager_set(int flag, void(*usage)(void));

#endif // OUTPUT_PAGER_H
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