Add task not completed warnings

lib/shared/cliOptions.js

@@ -87,7 +87,7 @@ module.exports = {
     count: true,
     // Can't use `default` because it seems to be off by one
     desc: chalk.gray(
-      'Set the loglevel. -L for least verbose and -LLLL for most verbose.' +
-      ' -LLL is default.'),
+      'Set the loglevel. -L for least verbose and -LLLL for most verbose. ' +
+      '-LLL is default.'),
   },
 };

lib/versioned/^4.0.0-alpha.1/index.js

@@ -11,6 +11,7 @@ var exit = require('../../shared/exit');
 
 var logTasks = require('../../shared/log/tasks');
 var logEvents = require('./log/events');
+var logSyncTask = require('./log/syncTask');
 var logTasksSimple = require('./log/tasksSimple');
 
 function execute(opts, env) {
@@ -25,6 +26,7 @@ function execute(opts, env) {
 
   var gulpInst = require(env.modulePath);
   logEvents(gulpInst);
+  logSyncTask(gulpInst);
 
   // This is what actually loads up the gulpfile
   require(env.configPath);

lib/versioned/^4.0.0-alpha.1/log/syncTask.js

@@ -0,0 +1,44 @@
+'use strict';
+
+var log = require('gulplog');
+var chalk = require('chalk');
+
+var tasks = {};
+
+function warn() {
+  var taskKeys = Object.keys(tasks);
+
+  if (!taskKeys.length) {
+    return;
+  }
+
+  var taskNames = taskKeys.map(function(key) {
+    return tasks[key];
+  }).join(', ');
+
+  log.warn(
+    chalk.red('The following tasks did not complete:'),
+    chalk.cyan(taskNames)
+  );
+  log.warn(
+    chalk.red('Did you forget to signal async completion?')
+  );
+}
+
+function start(e) {
+  tasks[e.uid] = e.name;
+}
+
+function clear(e) {
+  delete tasks[e.uid];
+}
+
+function logSyncTask(gulpInst) {
+
+  process.once('exit', warn);
+  gulpInst.on('start', start);
+  gulpInst.on('stop', clear);
+  gulpInst.on('error', clear);
+}
+
+module.exports = logSyncTask;