install gulp to process code

node_modules/gulp-cli/lib/shared/completion.js

@@ -0,0 +1,20 @@
+'use strict';
+
+var fs = require('fs');
+var path = require('path');
+
+var messages = require('@gulpjs/messages');
+
+module.exports = function(name, translate) {
+  if (typeof name !== 'string') {
+    throw new Error(translate.message({ tag: messages.COMPLETION_TYPE_MISSING }));
+  }
+  var file = path.join(__dirname, '../../completion', name);
+  try {
+    console.log(fs.readFileSync(file, 'utf8'));
+    process.exit(0);
+  } catch (err) {
+    console.log(translate.message({ tag: messages.COMPLETION_TYPE_UNKNOWN, name: name }));
+    process.exit(5);
+  }
+};