refactor(console/generate): utilize hexo-util

lib/plugins/console/generate.js

@@ -6,8 +6,8 @@ const Promise = require('bluebird');
 const prettyHrtime = require('pretty-hrtime');
 const { cyan, magenta } = require('chalk');
 const tildify = require('tildify');
-const { Transform, PassThrough } = require('stream');
-const { HashStream } = require('hexo-util');
+const { PassThrough } = require('stream');
+const { CacheStream, HashStream } = require('hexo-util');
 
 function generateConsole(args = {}) {
   const force = args.f || args.force;
@@ -178,28 +178,4 @@ function pipeStream(...args) {
   });
 }
 
-function CacheStream() {
-  Reflect.apply(Transform, this, []);
-
-  this._cache = [];
-}
-
-require('util').inherits(CacheStream, Transform);
-
-CacheStream.prototype._transform = function(chunk, enc, callback) {
-  const buf = chunk instanceof Buffer ? chunk : Buffer.from(chunk, enc);
-
-  this._cache.push(buf);
-  this.push(buf);
-  callback();
-};
-
-CacheStream.prototype.destroy = function() {
-  this._cache.length = 0;
-};
-
-CacheStream.prototype.getCache = function() {
-  return Buffer.concat(this._cache);
-};
-
 module.exports = generateConsole;