Redirect lat/lon/zoom query params to hash

app/controllers/site_controller.rb

@@ -8,6 +8,12 @@ class SiteController < ApplicationController
   before_filter :require_oauth, :only => [:index]
 
   def index
+    if params[:lat] && params[:lon]
+      params[:anchor] = "#{params.delete(:zoom) || 5}/#{params.delete(:lat)}/#{params.delete(:lon)}"
+      redirect_to params
+      return
+    end
+
     unless STATUS == :database_readonly or STATUS == :database_offline
       session[:location] ||= OSM::IPLocation(request.env['REMOTE_ADDR'])
     end
@@ -15,19 +21,18 @@ class SiteController < ApplicationController
 
   def permalink
     lon, lat, zoom = ShortLink::decode(params[:code])
-    new_params = params.clone
-    new_params.delete :code
+    new_params = params.except(:code, :lon, :lat, :zoom)
+
     if new_params.has_key? :m
       new_params.delete :m
       new_params[:mlat] = lat
       new_params[:mlon] = lon
-    else
-      new_params[:lat] = lat
-      new_params[:lon] = lon
     end
-    new_params[:zoom] = zoom
+
     new_params[:controller] = 'site'
     new_params[:action] = 'index'
+    new_params[:anchor] = "#{zoom}/#{lat}/#{lon}"
+
     redirect_to new_params
   end