[sitemap] introduce attribute to define start URLs

Change-Id: I09018a824310ef48f6b62f04f09d6fd704808119
Closes-bug: #1506601

sitemap/README.rst

@@ -24,6 +24,11 @@ The result will be available in the file ``sitemap_developer.openstack.org.xml``
 
 To write log messages into a file append the parameter ``-s LOG_FILE=scrapy.log``.
 
+It is possible to define a set of additional start URLs using the attribute
+``urls``. Separate multiple URLs with ``,``.
+
+    $ scrapy crawl sitemap -a domain=developer.openstack.org -a urls="http://developer.openstack.org/de/api-guide/quick-start/"
+
 Dependencies
 ============
 

sitemap/generator/spiders/sitemap.py

@@ -42,13 +42,13 @@ class SitemapSpider(spiders.CrawlSpider):
         )
     ]
 
-    def __init__(self, domain='docs.openstack.org', *args, **kwargs):
+    def __init__(self, domain='docs.openstack.org', urls='', *args, **kwargs):
         super(SitemapSpider, self).__init__(*args, **kwargs)
         self.domain = domain
         self.allowed_domains = [domain]
-        self.start_urls = [
-            'http://%s/index.html' % domain,
-        ]
+        self.start_urls = ['http://%s/index.html' % domain]
+        for url in urls.split(','):
+            self.start_urls.append(url)
 
     def parse_item(self, response):
         item = items.SitemapItem()