Add basic backlight percentage support

At the moment linux only, but will add support for OpenBSD as well.

1 files changed, 3 insertions, 0 deletions

diff --git a/slstatus.h b/slstatus.h
index 8bd8bb5..a18b881 100644
--- a/slstatus.h
+++ b/slstatus.h
@@ -1,5 +1,8 @@
 /* See LICENSE file for copyright and license details. */
 
+/* backlight */
+const char *backlight_perc(const char *);
+
 /* battery */
 const char *battery_perc(const char *);
 const char *battery_state(const char *);