[PATCH 07 of 23 Series-D] hgweb: move revnavgen into an object

[Pierre-Yves David]

# HG changeset patch
# User Pierre-Yves David <pierre-yves.david at logilab.fr>
# Date 1357838057 -3600
# Node ID 171cc6997b2a2fc3e0b47e7320c4f118757814a9
# Parent  07aa6cd3e20a89210cda4496d888fdec2cf23901
hgweb: move revnavgen into an object

To simplify it and make it resistant to filtering we need to move the logic in
an object.

diff --git a/mercurial/hgweb/webcommands.py b/mercurial/hgweb/webcommands.py
--- a/mercurial/hgweb/webcommands.py
+++ b/mercurial/hgweb/webcommands.py
@@ -243,11 +243,11 @@ def changelog(web, req, tmpl, shortlog=F
     start = max(0, pos - revcount + 1)
     end = min(count, start + revcount)
     pos = end - 1
     parity = paritygen(web.stripecount, offset=start - end)
 
-    changenav = webutil.revnavgen(pos, revcount, count, web.repo.changectx)
+    changenav = webutil.revnav().gen(pos, revcount, count, web.repo.changectx)
 
     return tmpl(shortlog and 'shortlog' or 'changelog', changenav=changenav,
                 node=ctx.hex(), rev=pos, changesets=count,
                 entries=lambda **x: changelist(**x),
                 latestentry=lambda **x: changelist(lastest=True,**x),
@@ -774,11 +774,11 @@ def filelog(web, req, tmpl):
                       "branches": webutil.nodebranchdict(repo, iterfctx)})
         for e in reversed(l):
             yield e
 
     nodefunc = lambda x: fctx.filectx(fileid=x)
-    nav = webutil.revnavgen(end - 1, revcount, count, nodefunc)
+    nav = webutil.revnav().gen(end - 1, revcount, count, nodefunc)
     return tmpl("filelog", file=f, node=fctx.hex(), nav=nav,
                 entries=lambda **x: entries(**x),
                 latestentry=lambda **x: entries(lastest=True, **x),
                 revcount=revcount, morevars=morevars, lessvars=lessvars)
 
@@ -854,11 +854,11 @@ def graph(web, req, tmpl):
     end = min(count, start + revcount)
     pos = end - 1
 
     uprev = min(max(0, count - 1), rev + revcount)
     downrev = max(0, rev - revcount)
-    changenav = webutil.revnavgen(pos, revcount, count, web.repo.changectx)
+    changenav = webutil.revnav().gen(pos, revcount, count, web.repo.changectx)
 
     tree = []
     if start < end:
         revs = list(web.repo.changelog.revs(end - 1, start))
         dag = graphmod.dagwalker(web.repo, revs)
diff --git a/mercurial/hgweb/webutil.py b/mercurial/hgweb/webutil.py
--- a/mercurial/hgweb/webutil.py
+++ b/mercurial/hgweb/webutil.py
@@ -22,63 +22,65 @@ def up(p):
     up = os.path.dirname(p)
     if up == "/":
         return "/"
     return up + "/"
 
-def revnavgen(pos, pagelen, limit, nodefunc):
-    """computes label and revision id for navigation link
+class revnav(object):
 
-    :pos: is the revision relative to which we generate navigation.
-    :pagelen: the since of each navigation pages
-    :limit: how far shall we link
-    :nodefun: factory for a changectx from a revision
+    def gen(self, pos, pagelen, limit, nodefunc):
+        """computes label and revision id for navigation link
 
-    The return is:
-        - a single element tuple
-        - containing a dictionary with a `before` and `after` key
-        - values are generator function taking arbitrary number of kwargs
-        - yield items are dictionnary with `label` and `node` key
-    """
-    def seq(factor, limit=None):
-        if limit:
-            yield limit
-            if limit >= 20 and limit <= 40:
-                yield 50
-        else:
-            yield 1 * factor
-            yield 3 * factor
-        for f in seq(factor * 10):
-            yield f
+        :pos: is the revision relative to which we generate navigation.
+        :pagelen: the since of each navigation pages
+        :limit: how far shall we link
+        :nodefun: factory for a changectx from a revision
 
-    navbefore = []
-    navafter = []
+        The return is:
+            - a single element tuple
+            - containing a dictionary with a `before` and `after` key
+            - values are generator function taking arbitrary number of kwargs
+            - yield items are dictionnary with `label` and `node` key
+        """
+        def seq(factor, limit=None):
+            if limit:
+                yield limit
+                if limit >= 20 and limit <= 40:
+                    yield 50
+            else:
+                yield 1 * factor
+                yield 3 * factor
+            for f in seq(factor * 10):
+                yield f
 
-    last = 0
-    for f in seq(1, pagelen):
-        if f < pagelen or f <= last:
-            continue
-        if f > limit:
-            break
-        last = f
-        if pos + f < limit:
-            navafter.append(("+%d" % f, hex(nodefunc(pos + f).node())))
-        if pos - f >= 0:
-            navbefore.insert(0, ("-%d" % f, hex(nodefunc(pos - f).node())))
+        navbefore = []
+        navafter = []
 
-    navafter.append(("tip", "tip"))
-    try:
-        navbefore.insert(0, ("(0)", hex(nodefunc('0').node())))
-    except error.RepoError:
-        pass
+        last = 0
+        for f in seq(1, pagelen):
+            if f < pagelen or f <= last:
+                continue
+            if f > limit:
+                break
+            last = f
+            if pos + f < limit:
+                navafter.append(("+%d" % f, hex(nodefunc(pos + f).node())))
+            if pos - f >= 0:
+                navbefore.insert(0, ("-%d" % f, hex(nodefunc(pos - f).node())))
 
-    def gen(l):
-        def f(**map):
-            for label, node in l:
-                yield {"label": label, "node": node}
-        return f
+        navafter.append(("tip", "tip"))
+        try:
+            navbefore.insert(0, ("(0)", hex(nodefunc('0').node())))
+        except error.RepoError:
+            pass
 
-    return (dict(before=gen(navbefore), after=gen(navafter)),)
+        def gen(l):
+            def f(**map):
+                for label, node in l:
+                    yield {"label": label, "node": node}
+            return f
+
+        return (dict(before=gen(navbefore), after=gen(navafter)),)
 
 def _siblings(siblings=[], hiderev=None):
     siblings = [s for s in siblings if s.node() != nullid]
     if len(siblings) == 1 and siblings[0].rev() == hiderev:
         return