Tying up Philips Hue lights to the exit-code status of my shell

hue-ci

#!/usr/bin/env node

/**
 * Activates all Philips Hue scenes for a given name, optionally
 *  restricted to a particular group (the new app seems to make scenes universal
 *  across groups so it may be necessary to look up the group ID associated with
 *  the room you want to be affected.
 *
 * Example usage:
 *
 * $ hue-ci "Office Green" 9
 *
 * Requires a HUE_IP (e.g. '10.0.1.6') and HUE_TOKEN (the "user name" portion of
 *  the HTTP API URL string) to be set as env vars.
 */

var http = require('http')

var hueIp = process.env['HUE_IP']
var hueToken = process.env['HUE_TOKEN']
var sceneName = process.argv[2]
var groupId = process.argv[3] || 0

var baseUrl = 'http://' + hueIp + '/api/' + hueToken

http.get(baseUrl, function (res) {
  var body = ''
  res.on('data', function (data) { body += data.toString() })
  res.on('end', function () {
    var hueConfig = JSON.parse(body)

    Object.keys(hueConfig.scenes).forEach(function (sceneId) {
      var scene = hueConfig.scenes[sceneId]
      if (scene.name === sceneName) {
        put(baseUrl + '/groups/' + groupId + '/action', {
          on: true,
          scene: sceneId
        }, function (res) {
          if (res.statusCode !== 200) {
            console.error('Failed to set scene to ' + sceneName + '!')
            process.exit(1)
          }
        })
      }
    })
  })
})

var url = require('url')
function put (uri, body, cb) {
  var bodyString = JSON.stringify(body)
  var opts = Object.assign({}, url.parse(uri), {
    method: 'PUT',
    headers: {
      'Content-Type': 'application/json',
      'Content-Length': bodyString.length
    }
  })
  http.request(opts, cb).write(bodyString)
}

ps1.sh

hue_ci()
{
  exit_code=$?
  if [ $exit_code -ne 0 ]
  then
    hue-ci "Office Red" 9
  else
    hue-ci "Office Green" 9
  fi
}

export PS1='$(hue_ci) <rest of prompt here> $'