Allow max option to fix a limit in crawling

Author: llaumgui

lib/W3CValidator.js

@@ -20,6 +20,7 @@ var pkg = require("../package.json");
 program.version(pkg.version)
         .usage("[options] <url>")
         .option("-l, --log", "log errors in a text file")
+        .option("-m, --max <n>", "max URLs to crawl")
         .option("-q, --query", "consider query string")
         .option("-v, --verbose", "show error details")
         .parse(process.argv);
@@ -135,6 +136,10 @@ W3CValidator.prototype.create = function() {
 
     this.crawler.on("fetchcomplete", (item) => {
         this.chunk.push(item.url);
+        if (program.max && this.chunk.length >= program.max) {
+            this.crawler.emit("complete");
+            this.crawler.stop();
+        }
     });
 
     this.crawler.on("complete", () => {