Rainbow LED bash script for the PinePhone

rainbow-led.sh

#!/usr/bin/env bash

set_color() {
  local led="$1"
  local color="$2"
  echo "$color" >/sys/class/leds/pinephone:"$led":user/brightness
}
DECL_set_color=$(declare -f set_color)

# TODO: implement PWM, however that works
random_color() {
  local led="$1"
  local color=$[($RANDOM % $(cat /sys/class/leds/pinephone:"$led":user/max_brightness)) + 1]
  echo "$color" >/sys/class/leds/pinephone:"$led":user/brightness
}
DECL_random_color=$(declare -f random_color)

do_led() {
  for (( i=1; c<="$2"; c++ )); do
    sudo bash -c "$DECL_random_color; random_color $3"
    sleep "$1"
  done
}

set -e
export REPEAT=10
export DELAY=3
while (( "$#" )); do
  case "$1" in
    --repeat)
      export REPEAT=$2
      shift 2
      ;;
    --delay)
      export DELAY=$2
      shift 2
      ;;
    --seperate)
      do_led "$[($RANDOM % 1) + 1]" "$REPEAT" "red" &
      do_led "$[($RANDOM % 2) + 1]" "$REPEAT" "green" &
      do_led "$[($RANDOM % 3) + 1]" "$REPEAT" "blue" &
      exit
      ;;
    --clear)
      sudo bash -c "$DECL_set_color; set_color red 0"
      sudo bash -c "$DECL_set_color; set_color green 0"
      sudo bash -c "$DECL_set_color; set_color blue 0"
      exit
      ;;
    *)
      (>&2 echo "Invalid argument $1")
      ;;
  esac
done

for (( i=1; c<="$REPEAT"; c++ )); do
  sudo bash -c "$DECL_random_color; random_color red"
  sudo bash -c "$DECL_random_color; random_color green"
  sudo bash -c "$DECL_random_color; random_color blue"
  sleep "$DELAY"
done