fix bug of return value

nhentai/cmdline.py

@@ -46,20 +46,20 @@ def cmd_parser():
     if args.is_download and not args.id and not args.ids and not args.keyword:
         logger.critical('Doujinshi id/ids is required for downloading')
         parser.print_help()
-        exit(1)
+        exit(0)
 
     if args.id:
         args.ids = (args.id, ) if not args.ids else args.ids
 
     if not args.keyword and not args.ids:
         parser.print_help()
-        exit(1)
+        exit(0)
 
     if args.threads <= 0:
         args.threads = 1
     elif args.threads > 10:
         logger.critical('Maximum number of used threads is 10')
-        exit(1)
+        exit(0)
 
     if args.proxy:
         import urlparse

nhentai/command.py

@@ -28,7 +28,7 @@ def main():
             doujinshi_info = doujinshi_parser(id)
             doujinshi_list.append(Doujinshi(**doujinshi_info))
     else:
-        exit(1)
+        exit(0)
 
     if options.is_download:
         downloader = Downloader(path=options.saved_path,

nhentai/parser.py

@@ -1,6 +1,5 @@
 # coding: utf-8
 from __future__ import print_function
-import sys
 import re
 import requests
 from bs4 import BeautifulSoup
@@ -30,7 +29,7 @@ def doujinshi_parser(id_):
         response = request('get', url).content
     except Exception as e:
         logger.critical(str(e))
-        sys.exit()
+        exit(1)
 
     html = BeautifulSoup(response)
     doujinshi_info = html.find('div', attrs={'id': 'info'})
@@ -45,7 +44,8 @@ def doujinshi_parser(id_):
     img_id = re.search('/galleries/([\d]+)/cover\.(jpg|png)$', doujinshi_cover.a.img['src'])
     if not img_id:
         logger.critical('Tried yo get image id failed')
-        sys.exit()
+        exit(1)
+
     doujinshi['img_id'] = img_id.group(1)
     doujinshi['ext'] = img_id.group(2)