test-media

#!/bin/bash
#
# This is an example to show the huebridge-shell code in action.  We
# pretend to be a simple media center
#
# I make no claims that this is good code!  It's just a proof of concept,
# so there's a lot of hard-coded duplication (eg names of the lights).
# (associative arrays might make more sense)
# But I think this makes for more readable code.

# Startup state
power=off
dvd=off
bluray=on
mac=off
radio=off
wii=off
volume=50

# What if a light is turned on
do_on()
{
  case $1 in
     POWER) power=on ;;
       DVD) dvd=on  ; bluray=off ; mac=off ; radio=off ; wii=off ;;
    BLURAY) dvd=off ; bluray=on  ; mac=off ; radio=off ; wii=off ;;
       MAC) dvd=off ; bluray=off ; mac=on  ; radio=off ; wii=off ;;
     RADIO) dvd=off ; bluray=off ; mac=off ; radio=on  ; wii=off ;;
       WII) dvd=off ; bluray=off ; mac=off ; radio=off ; wii=on  ;;
  esac
}

# It only makes sense to turn power off.  We remember the
# previous state (what input was selected, volume) just by not
# touching them.
do_off()
{
  if [ $1 == "POWER" ]
  then
    power=off
  fi
}

while [ 1 ]
do
  # Each time round the loop, send updates back to the bridge.
  # We'll just update every light, because turning one light on
  # may impact others
  
  echo 'LIST#Power#DVD#BluRay#Mac Mini#Radio#WII'

  echo "LIGHT#Power#$power#$volume"
  echo "LIGHT#DVD#$dvd#0"
  echo "LIGHT#BluRay#$bluray#0"
  echo "LIGHT#Mac Mini#$mac#0"
  echo "LIGHT#Radio#$radio#abc"
  echo "LIGHT#WII#$wii#99"

  # Wait for a command.  If we don't get one in five seconds then go back
  # round the loop, which will send a new update anyway
  # This is a simple way of sending periodic updates to the gateway without
  # needing coprocesses.  It means that updates after a command
  # is done immediately but an outside event (there are none here, but
  # there could be in a real example) will be delayed no longer than 5
  # seconds.
  read -t 5 input

  # This is a cheap and nasty way of splitting the command up; it works
  # because none of the lights can have a space in their name.
  OIFS="$IFS"
  IFS="#"
  set -- $input
  declare -u command=$1
  declare -u name=$2
  declare -u state=$3
  bright=$4
  IFS="$OIFS"

  # We only care about the LIGHT command
  if [ "$command" == "LIGHT" ]
  then
    # Ignore states that are not on/off
    case $state in
      OFF) do_off $name ;;
       ON) do_on $name ;;
    esac

    # Brightness only impacts power, where we set the volume
    if [[ $name == "POWER" && $bright =~ ^[0-9]+$ ]]
    then
      volume=$bright
    fi
  fi
done