narrow: factor out logic to build ellipses related b2parts in separate fn

This will help us switch more cleanly to using wireprotocol commands instead of
using exchange.pull() which exchanges more things then required.

Differential Revision: https://phab.mercurial-scm.org/D6435

hgext/narrow/narrowbundle2.py

@@ -57,11 +57,18 b' def getbundlechangegrouppart_narrow(bund'
         raise ValueError(_('no common changegroup version'))
     version = max(cgversions)
 
-    include = sorted(filter(bool, kwargs.get(r'includepats', [])))
-    exclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
-    newmatch = narrowspec.match(repo.root, include=include, exclude=exclude)
+    oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
+    oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
+    newinclude = sorted(filter(bool, kwargs.get(r'includepats', [])))
+    newexclude = sorted(filter(bool, kwargs.get(r'excludepats', [])))
+    generateellipsesbundle2(bundler, repo, oldinclude, oldexclude, newinclude,
+            newexclude, version, common, kwargs.get('known', []),
+            kwargs.get(r'depth', None), heads)
 
-    depth = kwargs.get(r'depth', None)
+def generateellipsesbundle2(bundler, repo, oldinclude, oldexclude, newinclude,
+                            newexclude, version, common, known, depth, heads):
+    newmatch = narrowspec.match(repo.root, include=newinclude,
+                                exclude=newexclude)
     if depth is not None:
         depth = int(depth)
         if depth < 1:
@@ -69,10 +76,8 b' def getbundlechangegrouppart_narrow(bund'
 
     heads = set(heads or repo.heads())
     common = set(common or [nullid])
-    oldinclude = sorted(filter(bool, kwargs.get(r'oldincludepats', [])))
-    oldexclude = sorted(filter(bool, kwargs.get(r'oldexcludepats', [])))
-    known = {bin(n) for n in kwargs.get(r'known', [])}
-    if known and (oldinclude != include or oldexclude != exclude):
+    known = {bin(n) for n in known}
+    if known and (oldinclude != newinclude or oldexclude != newexclude):
         # Steps:
         # 1. Send kill for "$known & ::common"
         #