Add event comicPageLink for every previous link.

This event allows a listener to build connections between pages.

dosagelib/events.py

@@ -38,6 +38,10 @@ class EventHandler(object):
         """Emit a comic downloaded event. Should be overridden in subclass."""
         pass
 
+    def comicPageLink(self, comic, url, prevUrl):
+        """Emit an event to inform the handler about links between comic pages. Should be overridden in subclass."""
+        pass
+
     def end(self):
         """Emit an end event. Should be overridden in subclass."""
         pass
@@ -216,6 +220,11 @@ class MultiHandler(object):
         for handler in _handlers:
             handler.comicDownloaded(comic, filename)
 
+    def comicPageLink(self, comic, url, prevUrl):
+        """Emit an event to inform the handler about links between comic pages. Should be overridden in subclass."""
+        for handler in _handlers:
+            handler.comicPageLink(comic, url, prevUrl)
+
     def end(self):
         """Emit an end event. Should be overridden in subclass."""
         for handler in _handlers:

dosagelib/scraper.py

@@ -7,6 +7,7 @@ from . import loader
 from .util import fetchUrl, fetchUrls, getPageContent
 from .comic import ComicStrip
 from .output import out
+from .events import getHandler
 
 
 class _BasicScraper(object):
@@ -161,6 +162,7 @@ class _BasicScraper(object):
             else:
                 prevUrl = self.prevUrlModifier(prevUrl)
                 out.debug("Matched previous URL %s" % prevUrl)
+                getHandler().comicPageLink(self.getName(), url, prevUrl)
         return prevUrl
 
     def getIndexStripUrl(self, index):