hgweb: allow urls to be shorter by using shortcuts

for example cs=xxx will be expanded to cmd=changeset;node=xxx

mercurial/hgweb.py

@@ -705,8 +705,22 b' class hgweb:'
         def footer(**map):
             yield self.t("footer", **map)
 
+        def expand_form(form):
+            shortcuts = {
+                'cs': [('cmd', ['changeset']), ('node', None)],
+            }
+            for k in shortcuts.iterkeys():
+                if form.has_key(k):
+                    for name, value in shortcuts[k]:
+                        if value is None:
+                            value = form[k]
+                        form[name] = value
+                    del form[k]
+
         self.refresh()
 
+        expand_form(req.form)
+
         t = self.repo.ui.config("web", "templates", templatepath())
         m = os.path.join(t, "map")
         style = self.repo.ui.config("web", "style", "")