Backlight animation

scripts/bin/system/backlight-ctl.sh

@@ -0,0 +1,52 @@
+#!/usr/bin/env bash
+
+# Print help info.
+function print_help() {
+  echo 'Control the backlight brightness with animation.'
+  echo
+  echo '-i    -- increase brightness'
+  echo '-d    -- decrease brightness'
+}
+
+# Increase backlight brightness.
+function increase() {
+  run_animation 'light -A 0.1'
+}
+
+# Decrease backlight brightness.
+function decrease() {
+  run_animation 'light -U 0.1'
+}
+
+# Run animation task.
+function run_animation() {
+  local cmd="${1}"
+  i=0
+  while [ $i -lt 50 ]; do
+    ${cmd}
+    sleep 0.01
+    ((i = i + 1));
+  done
+}
+
+
+# Check arguments
+for i in "$@"; do
+  case $i in
+    -h|--help)
+      print_help
+      exit 0
+      ;;
+    -i)
+      increase
+      ;;
+    -d)
+      decrease
+      ;;
+    *)
+      print_help
+      exit 1
+      ;;
+  esac
+done
+