bin/backlight: Adding more thorough description. Adding better help printout. Only print help on -h.

Print current brightness in percentage when not giving any parameter.

1 files changed, 9 insertions, 4 deletions

diff --git a/bin/backlight b/bin/backlight
index ac8a466..be0dadf 100755
--- a/bin/backlight
+++ b/bin/backlight
@@ -1,5 +1,9 @@
 #!/usr/bin/env bash
-# set backlight through sysfs
+#
+# Sets backlight through /sys/class/backlight/intel_backlight/brightness
+# Note: This requires the file to be user-writable!
+# Changes can be applied either by (positive or negative) relative increment
+# [-i] or as an absolute value [-s] (in percentage).
 
 set -euo pipefail
 
@@ -70,8 +74,8 @@ set_brightness() {
 }
 
 print_help() {
-  echo -e "Usage:\n $0 -d <decrement_by_x_percent> \n or $0 -i <increment_by_x_percent>"
-  exit 1
+  echo -e "Usage: $0 [-i <increment_in_percent>] [-s <brightness_in_percent>]"
+  exit 0
 }
 
 if [ ${#@} -gt 0 ]; then
@@ -93,7 +97,8 @@ if [ ${#@} -gt 0 ]; then
     esac
   done
 else
-  print_help
+  echo "$current_brightness_percentage"
+  exit 0
 fi
 
 set_brightness