[build] added gulp builder

tasks/neko.js

@@ -0,0 +1,35 @@
+const exec = require('./exec');
+const gutil = require('gulp-util');
+const through = require('through2');
+const col = gutil.colors;
+
+
+class Neko {
+
+    constructor() {
+        this.tag = 'Neko';
+    }
+
+    run() {
+        let stream = null;
+        const bufferContents = (file, enc, callback) => {
+            gutil.log(this.tag, col.cyan("run"), col.magenta(file.path));
+
+            exec('.', ['neko', file.path].join(' '))
+                .then(() => {
+                    stream.emit('end');
+                    callback();
+                })
+                .catch((error) => {
+                    stream.emit('error', new gutil.PluginError({plugin: this.tag, message: error}));
+                    callback();
+                });
+
+            stream.push(file);
+        };
+
+        return stream = through.obj(bufferContents);
+    }
+}
+
+module.exports = Neko;