From 324e2d6adff3acc74098b5f1a19e94ba2171917b Mon Sep 17 00:00:00 2001
From: David Runge <dave@sleepmap.de>
Date: Tue, 1 Jan 2019 19:06:07 +0100
Subject: 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.

---
 bin/backlight | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

(limited to 'bin')

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
-- 
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