removed signal docs from core.signals module, to leave them only in once place (the doc)

docs/ref/signals.rst

@@ -136,8 +136,8 @@ order.
 .. signal:: item_dropped
 .. function:: item_dropped(item, spider, response, exception)
 
-    Sent after an item has dropped from the :ref:`topics-item-pipeline` when some stage
-    raised a :exception:`DropItem` exception.
+    Sent after an item has been dropped from the :ref:`topics-item-pipeline`
+    when some stage raised a :exception:`DropItem` exception.
 
     :param item: the item dropped from the :ref:`topics-item-pipeline`
     :type item: :class:`~scrapy.item.ScrapedItem` object

scrapy/core/scraper.py

@@ -188,12 +188,12 @@ class Scraper(object):
             ex = output.value
             if isinstance(ex, DropItem):
                 log.msg("Dropped %s - %s" % (item, str(ex)), log.DEBUG, domain=domain)
-                signals.send_catch_log(signal=signals.item_dropped, \
-                    sender=self.__class__, item=item, spider=spider, exception=output.value)
+                signals.send_catch_log(signal=signals.item_dropped, sender=self.__class__, \
+                    item=item, spider=spider, response=response, exception=output.value)
             else:
                 log.msg('Error processing %s - %s' % (item, output), \
                     log.ERROR, domain=domain)
         else:
-            signals.send_catch_log(signal=signals.item_passed, \
-                sender=self.__class__, item=item, spider=spider, output=output)
+            signals.send_catch_log(signal=signals.item_passed, sender=self.__class__, \
+                item=item, spider=spider, response=response, output=output)
 

scrapy/core/signals.py

@@ -9,57 +9,18 @@ from pydispatch import dispatcher
 
 from scrapy import log
 
-# After the execution engine has started
-# args: None
 engine_started = object()
-
-# After the execution engine has stopped
-# args: None
 engine_stopped = object()
-
-# Before opening a new domain for crawling
-# args: domain, spider
 domain_open = object()
-
-# After a domain has been opened for crawling
-# args: domain, spider
 domain_opened = object()
-
-# When a domain has no remaining requests to process
-# args: domain, spider
 domain_idle = object()
-
-# After a domain has been closed
-# args: domain, spider, reason
 domain_closed = object()
-
-# New request received from spiders
-# args: request, spider, response
-# response is the response (fed to the spider) which generated the request
 request_received = object()
-
-# When request is sent in the downloader
-# args: request, spider
 request_uploaded = object()
-
-# When new response is received (by the engine) from the downloader (middleware)
-# args: response, spider
 response_received = object()
-
-# When response arrives from the downloader
-# args: response, spider
 response_downloaded = object()
-
-# After item is returned from spiders
-# args: item, spider, response
 item_scraped = object()
-
-# After item is processed by pipeline and pass all its stages
-# args: item, spider, response, pipe_output
 item_passed = object()
-
-# After item is dropped by pipeline
-# args: item, spider, response, exception
 item_dropped = object()
 
 def send_catch_log(signal, sender=None, **kwargs):