slstatus

commit 376f9191ee9db202963237d9b994f3131cb9a0c9
parent 641b8671c652d4d628ad83999d84962f22390993
Author: Santtu Lakkala <inz@inz.fi>
Date:   Wed, 23 Feb 2022 08:53:34 +0200

Allow modules to have no output

Instead of using a default value when modules return NULL, skip them
completely.

Diffstat:
M
config.def.h
 | 
9
++++++---
M
slstatus.c
 | 
2
+-

2 files changed, 7 insertions(+), 4 deletions(-)
diff --git a/config.def.h b/config.def.h
@@ -3,9 +3,6 @@
 /* interval between updates (in ms) */
 const unsigned int interval = 1000;
 
-/* text to show if no value can be retrieved */
-static const char unknown_str[] = "n/a";
-
 /* maximum output string length */
 #define MAXLEN 2048
 
@@ -62,6 +59,12 @@ static const char unknown_str[] = "n/a";
  *                                                     NULL on OpenBSD
  * wifi_perc           WiFi signal in percent          interface name (wlan0)
  * wifi_essid          WiFi ESSID                      interface name (wlan0)
+ *
+ * wintitle            Selected part of a window title comma separated list of
+ *                                                     strings that must be
+ *                                                     present in the window
+ *                                                     title, with ! indicating
+ *                                                     the part to capture
  */
 static const struct arg args[] = {
 	/* function format          argument */
diff --git a/slstatus.c b/slstatus.c
@@ -89,7 +89,7 @@ main(int argc, char *argv[])
 		status[0] = '\0';
 		for (i = len = 0; i < LEN(args); i++) {
 			if (!(res = args[i].func(args[i].args))) {
-				res = unknown_str;
+				continue;
 			}
 			if ((ret = esnprintf(status + len, sizeof(status) - len,
 			                    args[i].fmt, res)) < 0) {