[tail] added TailVinyl class

haxetool/tail.js

@@ -1,7 +1,25 @@
 const through = require('through2');
-const {Tail} = require('tail');
 const {Writable} = require('stream');
 const {StringDecoder} = require('string_decoder');
+const Vinyl = require('vinyl');
+const {Tail} = require('tail');
+const {Transform} = require('stream');
+
+
+class TailVinyl extends Vinyl {
+
+    constructor(params) {
+        params.contents = new Transform();
+        super(params);
+        this.tail = new Tail(params.path);
+        this.tail.on('line', data => this.contents.write(data + '\n'));
+        this.tail.on('error', error => this.contents.write('error: ' + error));
+    }
+
+    dispose() {
+        this.tail.unwatch();
+    }
+}
 
 
 class StringWritable extends Writable {
@@ -32,17 +50,15 @@ class StringWritable extends Writable {
 }
 
 
+
 module.exports = (handler) => {
     return through.obj(function (file, enc, callback) {
         if (file.contents && file.contents.pipe) {
             file.contents.pipe(new StringWritable(handler));
-        } else {
-            const tail = new Tail(file.path);
-            tail.on('line', data => handler(data));
-            tail.on('error', error => handler('[ERROR]: ', error));
-            this.on('end', () => tail.unwatch());
         }
         this.push(file);
         callback();
     });
 };
+
+module.exports.TailVinyl = TailVinyl;