added from_crawler class method to SpiderManager

scrapy/commands/list.py

@@ -1,6 +1,4 @@
 from scrapy.command import ScrapyCommand
-from scrapy.utils.misc import load_object
-from scrapy.conf import settings
 
 class Command(ScrapyCommand):
 
@@ -11,7 +9,5 @@ class Command(ScrapyCommand):
         return "List available spiders"
 
     def run(self, args, opts):
-        spman_cls = load_object(settings['SPIDER_MANAGER_CLASS'])
-        spiders = spman_cls.from_settings(settings)
-        for s in spiders.list():
+        for s in self.crawler.spiders.list():
             print s

scrapy/crawler.py

@@ -33,7 +33,7 @@ class Crawler(object):
         self.configured = True
         self.extensions = ExtensionManager.from_crawler(self)
         spman_cls = load_object(self.settings['SPIDER_MANAGER_CLASS'])
-        self.spiders = spman_cls.from_settings(self.settings)
+        self.spiders = spman_cls.from_crawler(self)
         self.engine = ExecutionEngine(self, self._spider_closed)
 
     def crawl(self, spider, requests=None):

scrapy/spidermanager.py

@@ -5,7 +5,7 @@ spiders
 
 from zope.interface import implements
 
-from scrapy import log, signals
+from scrapy import signals
 from scrapy.interfaces import ISpiderManager
 from scrapy.utils.misc import walk_modules
 from scrapy.utils.spider import iter_spider_classes
@@ -32,6 +32,10 @@ class SpiderManager(object):
     def from_settings(cls, settings):
         return cls(settings.getlist('SPIDER_MODULES'))
 
+    @classmethod
+    def from_crawler(cls, crawler):
+        return cls.from_settings(crawler.settings)
+
     def create(self, spider_name, **spider_kwargs):
         try:
             return self._spiders[spider_name](**spider_kwargs)