test/background.c

/****************************************************************************
 * Copyright 2018-2021,2022 Thomas E. Dickey                                *
 * Copyright 2003-2014,2017 Free Software Foundation, Inc.                  *
 *                                                                          *
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 * copy of this software and associated documentation files (the            *
 * "Software"), to deal in the Software without restriction, including      *
 * without limitation the rights to use, copy, modify, merge, publish,      *
 * distribute, distribute with modifications, sublicense, and/or sell       *
 * copies of the Software, and to permit persons to whom the Software is    *
 * furnished to do so, subject to the following conditions:                 *
 *                                                                          *
 * The above copyright notice and this permission notice shall be included  *
 * in all copies or substantial portions of the Software.                   *
 *                                                                          *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
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 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
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 * holders shall not be used in advertising or otherwise to promote the     *
 * sale, use or other dealings in this Software without prior written       *
 * authorization.                                                           *
 ****************************************************************************/
/*
 * $Id: background.c,v 1.24 2022/12/10 22:28:50 tom Exp $
 */

#define NEED_COLOR_CODE 1
#define NEED_COLOR_NAME 1
#include <color_name.h>
#include <dump_window.h>

static int default_bg = COLOR_BLACK;
static int default_fg = COLOR_WHITE;

static void
test_background(void)
{
    NCURSES_COLOR_T f, b;
    int row;
    int chr;

    if (pair_content(0, &f, &b) == ERR) {
	printw("pair 0 contains no data\n");
    } else {
	printw("pair 0 contains (%d,%d)\n", (int) f, (int) b);
    }
    dump_window(stdscr);

    printw("Initializing pair 1 to red/%s\n", color_name(default_bg));
    init_pair(1, COLOR_RED, (NCURSES_COLOR_T) default_bg);
    bkgdset((chtype) (' ' | COLOR_PAIR(1)));
    printw("RED/BLACK\n");
    dump_window(stdscr);

    printw("Initializing pair 2 to %s/blue\n", color_name(default_fg));
    init_pair(2, (NCURSES_COLOR_T) default_fg, COLOR_BLUE);
    bkgdset((chtype) (' ' | COLOR_PAIR(2)));
    printw("This line should be %s/blue\n", color_name(default_fg));
    dump_window(stdscr);

    printw("Initializing pair 3 to %s/cyan (ACS_HLINE)\n", color_name(default_fg));
    init_pair(3, (NCURSES_COLOR_T) default_fg, COLOR_CYAN);
    printw("...and drawing a box which should be followed by lines\n");
    bkgdset(ACS_HLINE | (chtype) COLOR_PAIR(3));
    /*
     * Characters from vt100 line-drawing should be mapped to line-drawing,
     * since A_ALTCHARSET is set in the background, and the character part
     * of the background is replaced by the nonblank characters written.
     *
     * Characters not in the line-drawing range are usually sent as-is.
     *
     * With SVr4 curses it is possible to rely on this to mix uppercase text
     * with the (lowercase) line-drawing characters.  ncurses uses some of
     * the uppercase characters for encoding thick- and double-lines.
     */
    row = 7;
    mvprintw(row++, 10, "l");
    for (chr = 0; chr < 32; ++chr)
	AddCh(' ');
    printw("x\n");
    chr = 32;
    while (chr < 128) {
	if ((chr % 32) == 0)
	    mvprintw(row++, 10, "x");
	AddCh((chr == 127) ? ' ' : chr);
	if ((++chr % 32) == 0)
	    printw("x\n");
    }
    mvprintw(row++, 10, "m");
    for (chr = 0; chr < 32; ++chr)
	AddCh(' ');
    printw("j\n");
    dump_window(stdscr);

    bkgdset((chtype) (' ' | COLOR_PAIR(0)));
    printw("Default Colors\n");
    dump_window(stdscr);

    printw("Resetting colors to pair 1\n");
    bkgdset((chtype) (' ' | COLOR_PAIR(1)));
    printw("This line should be red/%s\n", color_name(default_bg));
    dump_window(stdscr);

    printw("Setting screen to pair 0\n");
    bkgd((chtype) (' ' | COLOR_PAIR(0)));
    dump_window(stdscr);

    printw("Setting screen to pair 1\n");
    bkgd((chtype) (' ' | COLOR_PAIR(1)));
    dump_window(stdscr);

    printw("Setting screen to pair 2\n");
    bkgd((chtype) (' ' | COLOR_PAIR(2)));
    dump_window(stdscr);

    printw("Setting screen to pair 3\n");
    bkgd((chtype) (' ' | COLOR_PAIR(3)));
    dump_window(stdscr);

    printw("Setting screen to pair 0\n");
    bkgd((chtype) (' ' | COLOR_PAIR(0)));
    dump_window(stdscr);
}

static void
usage(int ok)
{
    static const char *msg[] =
    {
	"Usage: background [options]"
	,""
	,USAGE_COMMON
	,"Options:"
#if HAVE_ASSUME_DEFAULT_COLORS
	," -a       invoke assume_default_colors, repeat to use in init_pair"
#endif
	," -b XXX   specify background color"
#if HAVE_USE_DEFAULT_COLORS
	," -d       invoke use_default_colors, repeat to use in init_pair"
#endif
	," -f XXX   specify foreground color"
	," -l FILE  log window-dumps to this file"
    };
    size_t n;

    for (n = 0; n < SIZEOF(msg); n++)
	fprintf(stderr, "%s\n", msg[n]);

    ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
}
/* *INDENT-OFF* */
VERSION_COMMON()
/* *INDENT-ON* */

int
main(int argc, char *argv[])
{
#if HAVE_ASSUME_DEFAULT_COLORS
    int a_option = 0;
#endif
#if HAVE_USE_DEFAULT_COLORS
    int d_option = 0;
#endif
    int ch;

    setlocale(LC_ALL, "");

    while ((ch = getopt(argc, argv, OPTS_COMMON "ab:df:l:")) != -1) {
	switch (ch) {
#if HAVE_ASSUME_DEFAULT_COLORS
	case 'a':
	    ++a_option;
	    break;
#endif
	case 'b':
	    default_bg = color_code(optarg);
	    break;
#if HAVE_USE_DEFAULT_COLORS
	case 'd':
	    ++d_option;
	    break;
#endif
	case 'f':
	    default_fg = color_code(optarg);
	    break;
	case 'l':
	    if (!open_dump(optarg))
		usage(FALSE);
	    break;
	case OPTS_VERSION:
	    show_version(argv);
	    ExitProgram(EXIT_SUCCESS);
	default:
	    usage(ch == OPTS_USAGE);
	    /* NOTREACHED */
	}
    }
#if HAVE_USE_DEFAULT_COLORS && HAVE_ASSUME_DEFAULT_COLORS
    if (a_option && d_option) {
	fprintf(stderr, "Use either -a or -d option, but not both\n");
	ExitProgram(EXIT_FAILURE);
    }
#endif

    initscr();
    cbreak();
    noecho();

    if (has_colors()) {
	start_color();

#if HAVE_USE_DEFAULT_COLORS
	if (d_option) {
	    printw("Using default colors...\n");
	    use_default_colors();
	    if (d_option > 1) {
		default_fg = -1;
		default_bg = -1;
	    }
	}
#endif
#if HAVE_ASSUME_DEFAULT_COLORS
	if (a_option) {
	    printw("Using assumed colors %s/%s...\n",
		   color_name(default_fg),
		   color_name(default_bg));
	    assume_default_colors(default_fg, default_bg);
	    if (a_option > 1) {
		default_fg = -1;
		default_bg = -1;
	    }
	}
#endif

	test_background();

    } else {
	printw("This demo requires a color terminal");
	getch();
    }
    endwin();
    close_dump();
    ExitProgram(EXIT_SUCCESS);
}