Replace gulp-util to plugin-error and some upgrade

gulp-util is deprecated and replaced to plugin-error package.
See more on this page:
https://medium.com/gulpjs/gulp-util-ca3b1f9f9ac5

Author: Bargamut

index.js

@@ -1,5 +1,5 @@
 'use strict';
-var gutil = require('gulp-util');
+var pluginError = require('plugin-error');
 var through = require('through2');
 var iconv = require('iconv-lite');
 
@@ -10,7 +10,7 @@ module.exports = function (options) {
 	options = options || {};
 
 	if (!options.from && !options.to) {
-		throw new gutil.PluginError('gulp-convert-encoding', 'At least one of `from` or `to` required');
+		throw new pluginError('gulp-convert-encoding', 'At least one of `from` or `to` required');
 	}
 
 	options.from = options.from || UTF8;
@@ -33,7 +33,7 @@ module.exports = function (options) {
 					.pipe(iconv.encodeStream(options.to, options.iconv.encode));
 				this.push(file);
 			} catch (err) {
-				this.emit('error', new gutil.PluginError('gulp-convert-encoding', err));
+				this.emit('error', new pluginError('gulp-convert-encoding', err));
 			}
 		}
 
@@ -43,7 +43,7 @@ module.exports = function (options) {
 				file.contents = iconv.encode(content, options.to, options.iconv.encode);
 				this.push(file);
 			} catch (err) {
-				this.emit('error', new gutil.PluginError('gulp-convert-encoding', err));
+				this.emit('error', new pluginError('gulp-convert-encoding', err));
 			}
 		}
 

package.json

@@ -30,16 +30,17 @@
     "charset"
   ],
   "dependencies": {
-    "gulp-util": "^3.0.6",
     "iconv-lite": "^0.4.9",
+    "plugin-error": "^1.0.1",
     "through2": "^2.0.0"
   },
   "devDependencies": {
-    "coveralls": "^2.11.2",
+    "coveralls": "^3.0.2",
     "event-stream": "^3.1.7",
-    "istanbul": "^0.3.5",
+    "istanbul": "^0.4.5",
     "mocha": "*",
     "mocha-lcov-reporter": "0.0.2",
-    "should": "^7.0.2"
+    "should": "^7.0.2",
+    "vinyl": "^2.2.0"
   }
 }

test.js

@@ -1,8 +1,9 @@
 'use strict';
 var should = require('should');
 var assert = require('assert');
-var gutil = require('gulp-util');
+var Vinyl = require('vinyl');
 var iconv = require('iconv-lite');
+var mystream = require('stream');
 var es = require('event-stream');
 var convertEncoding = require('./');
 
@@ -23,7 +24,7 @@ describe('gulp-convert-encoding', function() {
 		(function(){
 			var stream = convertEncoding({to: LATIN1});
 
-			stream.write(new gutil.File({
+			stream.write(new Vinyl({
 				base: path.join(__dirname, './fixtures/'),
 				cwd: __dirname,
 				path: path.join(__dirname + './fixtures/1x1.png')
@@ -45,7 +46,7 @@ describe('gulp-convert-encoding', function() {
 			cb();
 		});
 
-		stream.write(new gutil.File({
+		stream.write(new Vinyl({
 			base: __dirname,
 			path: __dirname + '/file.txt',
 			contents: null
@@ -66,10 +67,10 @@ describe('gulp-convert-encoding', function() {
 
 			stream.on('end', cb);
 
-			stream.write(new gutil.File({
+			stream.write(new Vinyl({
 				base: __dirname,
 				path: __dirname + '/file.txt',
-				contents: new Buffer(testString)
+				contents: Buffer.from(testString)
 			}));
 
 			stream.end();
@@ -86,10 +87,10 @@ describe('gulp-convert-encoding', function() {
 
 			stream.on('end', cb);
 
-			stream.write(new gutil.File({
+			stream.write(new Vinyl({
 				base: __dirname,
 				path: __dirname + '/file.txt',
-				contents: new Buffer([0xe4, 0xf6, 0xfc, 0xdf])
+				contents: Buffer.from([0xe4, 0xf6, 0xfc, 0xdf])
 			}));
 
 			stream.end();
@@ -106,16 +107,16 @@ describe('gulp-convert-encoding', function() {
 
 				// buffer the contents
 				file.contents.pipe(es.wait(function(err, data) {
-					assert.equal(iconv.decode(new Buffer(data), LATIN1), testString);
+					assert.equal(iconv.decode(Buffer.from(data), LATIN1), testString);
 				}));
 			});
 
 			stream.on('end', cb);
 
-			stream.write(new gutil.File({
+			stream.write(new Vinyl({
 				base: __dirname,
 				path: __dirname + '/file.txt',
-				contents: es.readArray([testString])
+				contents: new mystream.Readable({objectMode: true}).wrap(es.readArray([testString]))
 			}));
 
 			stream.end();
@@ -130,16 +131,16 @@ describe('gulp-convert-encoding', function() {
 
 				// buffer the contents
 				file.contents.pipe(es.wait(function(err, data) {
-					assert.equal(iconv.decode(new Buffer(data), UTF8), testString);
+					assert.equal(iconv.decode(Buffer.from(data), UTF8), testString);
 				}));
 			});
 
 			stream.on('end', cb);
 
-			stream.write(new gutil.File({
+			stream.write(new Vinyl({
 				base: __dirname,
 				path: __dirname + '/file.txt',
-				contents: es.readArray([new Buffer([0xe4, 0xf6, 0xfc, 0xdf])])
+				contents: new mystream.Readable({objectMode: true}).wrap(es.readArray([Buffer.from([0xe4, 0xf6, 0xfc, 0xdf])]))
 			}));
 
 			stream.end();