test/demo_tabs.c

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 * Copyright 2019-2020,2022 Thomas E. Dickey                                *
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/*
 * Author: Thomas E. Dickey
 *
 * $Id: demo_tabs.c,v 1.10 2022/12/04 00:40:11 tom Exp $
 *
 * A simple demo of tabs in curses.
 */
#define USE_CURSES
#define USE_TINFO
#include <test.priv.h>

static void
usage(int ok)
{
    static const char *msg[] =
    {
	"Usage: demo_tabs [options]"
	,""
	,"Print a grid to test tab-stops with the curses interface"
	,""
	,USAGE_COMMON
	,"Options:"
	," -l COUNT total number of lines to show"
	," -t NUM   set TABSIZE variable to the given value"
    };
    unsigned 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[])
{
    int tabstop;
    int ch, col, row, step;
    int line_limit = -1;
    int curses_stops = -1;

    while ((ch = getopt(argc, argv, OPTS_COMMON "l:t:")) != -1) {
	switch (ch) {
	case 'l':
	    line_limit = atoi(optarg);
	    break;
	case 't':
	    curses_stops = atoi(optarg);
	    break;
	case OPTS_VERSION:
	    show_version(argv);
	    ExitProgram(EXIT_SUCCESS);
	default:
	    usage(ch == OPTS_USAGE);
	    /* NOTREACHED */
	}
    }

    initscr();
    noecho();
    cbreak();
    if (curses_stops > 0)
	set_tabsize(curses_stops);
#if HAVE_TIGETNUM
    tabstop = tigetnum("it");
    if (tabstop <= 0)
#endif
	tabstop = 8;
    for (row = 0; row < LINES; ++row) {
	move(row, 0);
	for (col = step = 0; col < COLS - 1; ++col) {
	    if (row == 0) {
		chtype ct = '-';
		if ((col % tabstop) == 0)
		    ct = '+';
		addch(ct);
	    } else if (col + 1 < row) {
		addch('*');
	    } else {
		printw("%x", step);
		col = (row + (tabstop * ++step));
		col /= tabstop;
		col *= tabstop;
		col -= 1;
		if ((col + tabstop) < COLS)
		    addch('\t');
		refresh();
	    }
	}
	addch('\n');
	if (line_limit > 0 && row >= line_limit)
	    break;
    }
    getch();
    endwin();
    ExitProgram(EXIT_SUCCESS);
}