Fixes and clean up (#51)

* Simplify main

* Fix init

* Cleaner output for the end user

* Fix extractVideoGuid after sync with dev

* TokenCache: Make variable private

nit: switch to import

* Add option to disable video thumbnails

* Create a unique file name to avoid overwrite

* Remove os dependency

* Reimplement simulate

* Update README

Co-authored-by: @kylon
Co-authored-by: @snobu

utils.ts

@@ -1,6 +1,7 @@
 import { execSync } from 'child_process';
 import colors from 'colors';
 import fs from 'fs';
+import path from 'path';
 
 function sanitizeUrls(urls: string[]) {
     const rex = new RegExp(/(?:https:\/\/)?.*\/video\/[a-z0-9]{8}-(?:[a-z0-9]{4}\-){3}[a-z0-9]{12}$/, 'i');
@@ -13,7 +14,7 @@ function sanitizeUrls(urls: string[]) {
 
         if (!rex.test(url)) {
             if (url !== '')
-                console.warn(colors.yellow('Invalid URL at line ' + (i+1) + ', skip..\n'));
+                console.warn(colors.yellow('Invalid URL at line ' + (i+1) + ', skip..'));
 
             continue;
         }
@@ -57,3 +58,13 @@ export function checkRequirements() {
         process.exit(22);
     }
 }
+
+export function makeUniqueTitle(title: string, outDir: string) {
+    let ntitle = title;
+    let k = 0;
+
+    while (fs.existsSync(outDir + path.sep + ntitle + '.mp4'))
+        ntitle = title + ' - ' + (++k).toString();
+
+    return ntitle;
+}