1 /****************************************************************************
2 * Copyright 2019-2020,2022 Thomas E. Dickey *
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4 * Permission is hereby granted, free of charge, to any person obtaining a *
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27 ****************************************************************************/
28
29 /*
30 * Author: Thomas E. Dickey
31 *
32 * $Id: demo_tabs.c,v 1.10 2022/12/04 00:40:11 tom Exp $
33 *
34 * A simple demo of tabs in curses.
35 */
36 #define USE_CURSES
37 #define USE_TINFO
38 #include <test.priv.h>
39
40 static void
usage(int ok)41 usage(int ok)
42 {
43 static const char *msg[] =
44 {
45 "Usage: demo_tabs [options]"
46 ,""
47 ,"Print a grid to test tab-stops with the curses interface"
48 ,""
49 ,USAGE_COMMON
50 ,"Options:"
51 ," -l COUNT total number of lines to show"
52 ," -t NUM set TABSIZE variable to the given value"
53 };
54 unsigned n;
55 for (n = 0; n < SIZEOF(msg); ++n) {
56 fprintf(stderr, "%s\n", msg[n]);
57 }
58 ExitProgram(ok ? EXIT_SUCCESS : EXIT_FAILURE);
59 }
60 /* *INDENT-OFF* */
VERSION_COMMON()61 VERSION_COMMON()
62 /* *INDENT-ON* */
63
64 int
65 main(int argc, char *argv[])
66 {
67 int tabstop;
68 int ch, col, row, step;
69 int line_limit = -1;
70 int curses_stops = -1;
71
72 while ((ch = getopt(argc, argv, OPTS_COMMON "l:t:")) != -1) {
73 switch (ch) {
74 case 'l':
75 line_limit = atoi(optarg);
76 break;
77 case 't':
78 curses_stops = atoi(optarg);
79 break;
80 case OPTS_VERSION:
81 show_version(argv);
82 ExitProgram(EXIT_SUCCESS);
83 default:
84 usage(ch == OPTS_USAGE);
85 /* NOTREACHED */
86 }
87 }
88
89 initscr();
90 noecho();
91 cbreak();
92 if (curses_stops > 0)
93 set_tabsize(curses_stops);
94 #if HAVE_TIGETNUM
95 tabstop = tigetnum("it");
96 if (tabstop <= 0)
97 #endif
98 tabstop = 8;
99 for (row = 0; row < LINES; ++row) {
100 move(row, 0);
101 for (col = step = 0; col < COLS - 1; ++col) {
102 if (row == 0) {
103 chtype ct = '-';
104 if ((col % tabstop) == 0)
105 ct = '+';
106 addch(ct);
107 } else if (col + 1 < row) {
108 addch('*');
109 } else {
110 printw("%x", step);
111 col = (row + (tabstop * ++step));
112 col /= tabstop;
113 col *= tabstop;
114 col -= 1;
115 if ((col + tabstop) < COLS)
116 addch('\t');
117 refresh();
118 }
119 }
120 addch('\n');
121 if (line_limit > 0 && row >= line_limit)
122 break;
123 }
124 getch();
125 endwin();
126 ExitProgram(EXIT_SUCCESS);
127 }
128