--- a/dandelion/history.py	Tue Oct 07 19:38:08 2008 +0200
+++ b/dandelion/history.py	Wed Oct 08 16:56:55 2008 +0200
@@ -8,18 +8,35 @@
 from werkzeug import Response, redirect
 from werkzeug.exceptions import NotFound
 
+import viewer
+
 def history_action(wiki, request):
     """ Display the history of changes to a page, with links
         for viewing the revisions and optional diffs, if the
         diff action is available.
     """
     page = request.page
-    if page.current is None:
+    try:
+        rev = int(request.args["rev"])
+    except (ValueError, KeyError):
+        if page.current is None:
+            raise NotFound()
+        stream = wiki.template_stream("history.html", page, changes=list(page))
+        html = wiki.template("page.html", page, content=stream,
+                             title="History of %s" % page.title)
+        return Response(html, mimetype="text/html")
+    page = page[rev]
+    if rev not in page:
         raise NotFound()
-    stream = wiki.template_stream("history.html", page, changes=list(page))
-    html = wiki.template("page.html", page, content=stream,
-                         title="History of %s" % page.title)
-    return Response(html, mimetype="text/html")
+    mime = page.get_mime()
+    major, minor = mime.split('/')
+    viewer = (wiki.viewers.get(mime, None)
+              or wiki.viewers.get(major, viewer.binary_viewer))
+    try:
+        content = viewer(wiki, page)
+    except IndexError:
+        raise NotFound()
+    return Response(content, mimetype="text/html")
 
 def changes_action(wiki, request):
     """ Display list of recent changes in the wiki.

--- a/dandelion/wiki.py	Tue Oct 07 19:38:08 2008 +0200
+++ b/dandelion/wiki.py	Wed Oct 08 16:56:55 2008 +0200
@@ -31,6 +31,8 @@
         >>> c = Client(Wiki().application)
         >>> r = c.get('/')
         >>> assert(r[1] in ('200 OK', '404 Not found'))
+        >>> r = c.get('/edit/')
+        >>> assert(r[1] in ('200 OK', '404 Not found'))
     """
     def __init__(self, cfg=None):
         if cfg is None:

--- a/dandelion/wikipage.py	Tue Oct 07 19:38:08 2008 +0200
+++ b/dandelion/wikipage.py	Wed Oct 08 16:56:55 2008 +0200
@@ -18,10 +18,11 @@
         parts = [self.wiki.root_url]
         if action is not None:
             parts.append(url_quote(action, safe=""))
+        elif rev is not None:
+            parts.append(url_quote("history", safe=""))
+            kw['rev'] = rev
         parts.append(url_quote(self.title, safe=""))
         url = "/".join(parts)
-        if rev is not None:
-            kw['rev'] = rev
         args = "&".join("%s=%s" % (url_quote(k), url_quote(v)) for k, v in kw.iteritems())
         if args:
             url = "%s?%s" % (url, args)