keyboard_indicators.c - slstatus - status monitor
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keyboard_indicators.c (1238B)
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1 /* See LICENSE file for copyright and license details. */
2 #include <ctype.h>
3 #include <stdio.h>
4 #include <string.h>
5 #include <X11/Xlib.h>
6
7 #include "../slstatus.h"
8 #include "../util.h"
9
10 /*
11 * fmt consists of uppercase or lowercase 'c' for caps lock and/or 'n' for num
12 * lock, each optionally followed by '?', in the order of indicators desired.
13 * If followed by '?', the letter with case preserved is included in the output
14 * if the corresponding indicator is on. Otherwise, the letter is always
15 * included, lowercase when off and uppercase when on.
16 */
17 const char *
18 keyboard_indicators(const char *fmt)
19 {
20 Display *dpy;
21 XKeyboardState state;
22 size_t fmtlen, i, n;
23 int togglecase, isset;
24 char key;
25
26 if (!(dpy = XOpenDisplay(NULL))) {
27 warn("XOpenDisplay: Failed to open display");
28 return NULL;
29 }
30 XGetKeyboardControl(dpy, &state);
31 XCloseDisplay(dpy);
32
33 fmtlen = strnlen(fmt, 4);
34 for (i = n = 0; i < fmtlen; i++) {
35 key = tolower(fmt[i]);
36 if (key != 'c' && key != 'n')
37 continue;
38
39 togglecase = (i + 1 >= fmtlen || fmt[i + 1] != '?');
40 isset = (state.led_mask & (1 << (key == 'n')));
41
42 if (togglecase)
43 buf[n++] = isset ? toupper(key) : key;
44 else if (isset)
45 buf[n++] = fmt[i];
46 }
47
48 buf[n] = 0;
49 return buf;
50 }