Switch to bluebird and simplify gracefullyExit().

lib/provider.js

@@ -2,7 +2,7 @@ var path = require('path')
 var fork = require('child_process').fork
 
 var adb = require('adbkit')
-var Q = require('q')
+var Promise = require('bluebird')
 
 var log = require('./util/logger').createLogger('provider')
 var client = adb.createClient()
@@ -97,7 +97,7 @@ function maybeDisconnect(device) {
 }
 
 function tryKillWorker(id) {
-  var deferred = Q.defer(),
+  var deferred = Promise.defer(),
       worker = workers[id]
 
   function onExit() {
@@ -115,7 +115,7 @@ function tryKillWorker(id) {
 function forceKillWorker(id) {
   log.warn('Force killing worker of device "%s"', id)
 
-  var deferred = Q.defer()
+  var deferred = Promise.defer()
     , worker = workers[id]
 
   function onExit() {
@@ -143,15 +143,11 @@ function gracefullyKillWorker(id) {
 
 function gracefullyExit() {
   log.info('Stopping all workers')
-  Q.spawn(function* foo() {
-    var ops = []
-    for (var id in workers) {
-      ops.push(gracefullyKillWorker(id))
-    }
-    yield Q.all(ops)
-    log.info('All cleaned up')
-    process.exit(0)
-  })
+  Promise.all(Object.keys(workers).map(gracefullyKillWorker))
+    .done(function() {
+      log.info('All cleaned up')
+      process.exit(0)
+    })
 }
 
 process.on('SIGINT', function(e) {