hue toggle script for hue-cli

hue-toggle

#!/bin/bash

# SETUP:
#   Install hue-cli and register it to a Hue bridge first:
#       $ npm install -g hue-cli
#   Search the bridge IP
#       $ hue search
#       1 stations found
#       1: 192.168.0.106
##  Then register the CLI to the bridge
#       $ hue -H 192.168.0.106 register
#
# USAGE:
#    hue-toggle LIGHT_NUM1[,LIGHT_NUM2...]  [STEP1[,STEP2...]]

get_state () {
    total_brightness=255
    total_onoff='off'
    # off -> on -> dim
    for l in $lights
    do
        # format: "num on_off dimmer name..."
        state=( $(hue lights $l) )
        onoff=${state[1]}
        brightness=${state[2]}
        [ $brightness -lt $total_brightness ] && total_brightness=$brightness
        [ $onoff = on ] && total_onoff='on'
    done
    case $onoff in
        off) echo 'off';;
        on)  echo $total_brightness;;
    esac
}

rotate () {
    local state="$1"
    if [[ $state = off ]]
    then
        echo "{\"on\": true, \"bri\": ${steps[0]}}" | hue lights $lights state
    else
        for step in "${steps[@]}"
        do
            # Looks the max value is 254, even when we set it to 255
            if (( state < step && step <= 254 ))
            then
                hue lights ${lights} "=$step"
                return
            fi
        done
        hue lights ${lights} off
    fi
}

lights="$1"
steps_comma="${2:-30,254}"
steps=(${steps_comma//,/ })

rotate $(get_state)