X-Git-Url: https://git.xinqibao.xyz/slstatus.git/blobdiff_plain/7c11f890a5296ddd527ca956503bb33ceacd3ca9..1452a44832a302d8928793b889aafd05ab54df2c:/components/keyboard_indicators.c

diff --git a/components/keyboard_indicators.c b/components/keyboard_indicators.c
index ed4bc17..b35eba1 100644
--- a/components/keyboard_indicators.c
+++ b/components/keyboard_indicators.c
@@ -1,30 +1,48 @@
 /* See LICENSE file for copyright and license details. */
+#include <ctype.h>
 #include <stdio.h>
+#include <string.h>
 #include <X11/Xlib.h>
 
 #include "../util.h"
 
+/*
+ * fmt consists of uppercase or lowercase 'c' for caps lock and/or 'n' for num
+ * lock, each optionally followed by '?', in the order of indicators desired.
+ * If followed by '?', the letter with case preserved is included in the output
+ * if the corresponding indicator is on.  Otherwise, the letter is always
+ * included, lowercase when off and uppercase when on.
+ */
 const char *
-keyboard_indicators(void)
+keyboard_indicators(const char *fmt)
 {
 	Display *dpy;
 	XKeyboardState state;
+	size_t fmtlen, i, n;
+	int togglecase, isset;
+	char key;
 
 	if (!(dpy = XOpenDisplay(NULL))) {
-		fprintf(stderr, "Cannot open display\n");
+		warn("XOpenDisplay: Failed to open display");
 		return NULL;
 	}
 	XGetKeyboardControl(dpy, &state);
 	XCloseDisplay(dpy);
 
-	switch (state.led_mask) {
-		case 1:
-			return "c";
-		case 2:
-			return "n";
-		case 3:
-			return "cn";
-		default:
-			return "";
+	fmtlen = strnlen(fmt, 4);
+	for (i = n = 0; i < fmtlen; i++) {
+		key = tolower(fmt[i]);
+		if (key != 'c' && key != 'n') {
+			continue;
+		}
+		togglecase = (i + 1 >= fmtlen || fmt[i + 1] != '?');
+		isset = (state.led_mask & (1 << (key == 'n')));
+		if (togglecase) {
+			buf[n++] = isset ? toupper(key) : key;
+		} else if (isset) {
+			buf[n++] = fmt[i];
+		}
 	}
+	buf[n] = 0;
+	return buf;
 }