[build] update gulp debug logger

tasks/debug.js

@@ -20,11 +20,17 @@ const log = (line) => {
 
 module.exports = () => {
     return through.obj(function (file, enc, callback) {
+        const debug = file.debug;
+        if (!file.debug) {
+            this.emit('end');
+            callback();
+            return;
+        }
         const server = net.createServer((socket) => {
             socket.on("data", (data) => {
                 const lines = data.toString().split('\n');
                 for (let line of lines) if (line.length > 2) {
-                    log(line.substr(2));
+                    log(line);
                 }
             });
             socket.on("close", () => {
@@ -34,7 +40,8 @@ module.exports = () => {
                 callback();
             });
         });
-        server.listen(5000);
+        gutil.log(col.green('[debug]'), col.cyan('listen on'), col.magenta(`${debug.host}:${debug.port}`));
+        server.listen(debug.port, debug.host);
     })
 };