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/* Output stream for attributed text, producing ANSI escape sequences.
Copyright (C) 2006, 2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2006.
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 _TERM_OSTREAM_H
#define _TERM_OSTREAM_H
#include "ostream.h"
/* Querying and setting of text attributes.
The stream has a notion of the current text attributes; they apply
implicitly to all following output. The attributes are automatically
reset when the stream is closed.
Note: Not all terminal types can actually render all attributes adequately.
For example, xterm cannot render POSTURE_ITALIC nor the combination of
WEIGHT_BOLD and UNDERLINE_ON. */
/* Colors are represented by indices >= 0 in a stream dependent format. */
typedef int term_color_t;
/* The value -1 denotes the default (foreground or background) color. */
enum
{
COLOR_DEFAULT = -1 /* unknown */
};
typedef enum
{
WEIGHT_NORMAL = 0,
WEIGHT_BOLD,
WEIGHT_DEFAULT = WEIGHT_NORMAL
} term_weight_t;
typedef enum
{
POSTURE_NORMAL = 0,
POSTURE_ITALIC, /* same as oblique */
POSTURE_DEFAULT = POSTURE_NORMAL
} term_posture_t;
typedef enum
{
UNDERLINE_OFF = 0,
UNDERLINE_ON,
UNDERLINE_DEFAULT = UNDERLINE_OFF
} term_underline_t;
struct term_ostream : struct ostream
{
methods:
/* Convert an RGB value (red, green, blue in [0..255]) to a color, valid
for this stream only. */
term_color_t rgb_to_color (term_ostream_t stream,
int red, int green, int blue);
/* Get/set the text color. */
term_color_t get_color (term_ostream_t stream);
void set_color (term_ostream_t stream, term_color_t color);
/* Get/set the background color. */
term_color_t get_bgcolor (term_ostream_t stream);
void set_bgcolor (term_ostream_t stream, term_color_t color);
/* Get/set the font weight. */
term_weight_t get_weight (term_ostream_t stream);
void set_weight (term_ostream_t stream, term_weight_t weight);
/* Get/set the font posture. */
term_posture_t get_posture (term_ostream_t stream);
void set_posture (term_ostream_t stream, term_posture_t posture);
/* Get/set the text underline decoration. */
term_underline_t get_underline (term_ostream_t stream);
void set_underline (term_ostream_t stream,
term_underline_t underline);
};
#ifdef __cplusplus
extern "C" {
#endif
/* Create an output stream referring to the file descriptor FD.
FILENAME is used only for error messages.
The resulting stream will be line-buffered.
Note that the resulting stream must be closed before FD can be closed. */
extern term_ostream_t term_ostream_create (int fd, const char *filename);
#ifdef __cplusplus
}
#endif
#endif /* _TERM_OSTREAM_H */
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