hgweb: handle "parity" internally in webutil.diffs()

There's apparently no reason to have the "parity" of diff blocks that
webutil.diffs() generates coming from outside the function. So have it
internally managed. We thus now pass a "web" object to webutil.diffs() to get
access to both "repo" and "stripecount" attribute.

mercurial/hgweb/webcommands.py

@@ -756,12 +756,11 b' def filediff(web, req, tmpl):'
         ctx = fctx.changectx()
     basectx = ctx.p1()
 
-    parity = paritygen(web.stripecount)
     style = web.config('web', 'style', 'paper')
     if 'style' in req.form:
         style = req.form['style'][0]
 
-    diffs = webutil.diffs(web.repo, tmpl, ctx, basectx, [path], parity, style)
+    diffs = webutil.diffs(web, tmpl, ctx, basectx, [path], style)
     if fctx is not None:
         rename = webutil.renamelink(fctx)
         ctx = fctx

mercurial/hgweb/webutil.py

@@ -388,8 +388,7 b' def changesetentry(web, req, tmpl, ctx):'
     if 'style' in req.form:
         style = req.form['style'][0]
 
-    parity = paritygen(web.stripecount)
-    diff = diffs(web.repo, tmpl, ctx, basectx, None, parity, style)
+    diff = diffs(web, tmpl, ctx, basectx, None, style)
 
     parity = paritygen(web.stripecount)
     diffstatsgen = diffstatgen(ctx, basectx)
@@ -414,7 +413,7 b' def listfilediffs(tmpl, files, node, max'
     if len(files) > max:
         yield tmpl('fileellipses')
 
-def diffs(repo, tmpl, ctx, basectx, files, parity, style):
+def diffs(web, tmpl, ctx, basectx, files, style):
 
     def prettyprintlines(lines, blockno):
         for lineno, l in enumerate(lines, 1):
@@ -433,6 +432,7 b' def diffs(repo, tmpl, ctx, basectx, file'
                        lineid="l%s" % difflineno,
                        linenumber="% 8s" % difflineno)
 
+    repo = web.repo
     if files:
         m = match.exact(repo.root, repo.getcwd(), files)
     else:
@@ -441,6 +441,7 b' def diffs(repo, tmpl, ctx, basectx, file'
     diffopts = patch.diffopts(repo.ui, untrusted=True)
     node1 = basectx.node()
     node2 = ctx.node()
+    parity = paritygen(web.stripecount)
 
     diffhunks = patch.diffhunks(repo, node1, node2, m, opts=diffopts)
     for blockno, (header, hunks) in enumerate(diffhunks, 1):