fix(core): use Promise from compodoc

fix #4

index.js

@@ -1,41 +1,48 @@
 'use strict';
 const gutil = require('gulp-util'),
-      PluginError = gutil.PluginError,
-      es = require('event-stream'),
-      through = require('through2'),
-      compodocModule = require('@compodoc/compodoc'),
-      PLUGIN_NAME = 'gulp-compodoc';
+    PluginError = gutil.PluginError,
+    es = require('event-stream'),
+    through = require('through2'),
+    compodocModule = require('@compodoc/compodoc'),
+    PLUGIN_NAME = 'gulp-compodoc';
 
 function compodoc(options) {
     var files = [];
-	options = options || {};
+    options = options || {};
 
     return es.through(function(file) {
-		files.push(file.path);
-	}, function() {
-		var stream = this;
+        files.push(file.path);
+    }, function() {
+        var stream = this;
 
-		if (files.length === 0) {
-			stream.emit('error', new PluginError(PLUGIN_NAME, 'No input files for compodoc.'));
-			stream.emit('end');
-			return;
-		} else if (!options.output) {
-			stream.emit('error', new PluginError(PLUGIN_NAME, 'You must either specify the \'output\' option.'));
-			stream.emit('end');
-			return;
-		} else {
+        if (files.length === 0) {
+            stream.emit('error', new PluginError(PLUGIN_NAME, 'No input files for compodoc.'));
+            stream.emit('end');
+            return;
+        } else if (!options.output) {
+            stream.emit('error', new PluginError(PLUGIN_NAME, 'You must either specify the \'output\' option.'));
+            stream.emit('end');
+            return;
+        } else {
             var app = new compodocModule.Application(options);
 
-            app.setFiles(files);
-            app.generate();
-
-            process.on('exit', function() {
+            try {
+                app.setFiles(files);
+                app.generate().then(function() {
+                  stream.emit('end');
+                  return;
+                }, function(error) {
+                  stream.emit('error', new PluginError(PLUGIN_NAME, error));
+                  stream.emit('end');
+                  return;
+                });
+            } catch (e) {
+                stream.emit('error', e);
                 stream.emit('end');
-            });
-
-			return;
-		}
-	});
+                return;
+            }
+        }
+    });
 }
 
 module.exports = compodoc;

package.json

@@ -32,7 +32,7 @@
     "node": ">=5.10.0"
   },
   "dependencies": {
-    "@compodoc/compodoc": "^1.0.2",
+    "@compodoc/compodoc": "^1.0.3",
     "event-stream": "^3.3.4",
     "gulp-util": "^3.0.7",
     "through2": "^2.0.1"