Add cache-busting path for webshims

README.md

@@ -37,17 +37,34 @@ Since webshims does not support fingerprinting, this will result in 404s (missin
    (Note that this should be run directly, not in a dom-ready block.)
 
   ```javascript
-  $.webshims.setOptions('basePath', '/assets/webshims/shims/')
+  $.webshims.setOptions('basePath', '/webshims/shims/1.15.6/')
   $.webshims.polyfill()
   ```
 
+   The version number above should match the version of Webshims. When you update the gem change this so browser-cached files get reloaded. If you are interpolating your JavaScript, you can use the helper `webshims_path` to automatically populate the path with version number.
+
 4. For Turbolinks users only: you'll need to update the polyfill on page load:
 
   ```coffeescript
   $(document).on "page:load", ->
     $(this).updatePolyfill()
   ```
 
+5. For Spork users, if you have a line to reload your routes for each spec run in your `spec_helper`:
+
+  ```ruby
+  Spork.each_run do
+    # This code will be run each time you run your specs.
+    load "#{Rails.root}/config/routes.rb"
+  end
+  ```
+
+   Then you need to add the `mount` to your `config/routes.rb` otherwise it gets removed by Spork's reload.
+
+   ```ruby
+   mount Webshims::Rails::Rewrite.new, at: '/webshims/shims'
+   ```
+
 ## Updating this gem
 
 This is only in the case this repository is not up-to-date; I try to stay current with webshims but sometimes I miss the webshims releases.

config/routes.rb

@@ -0,0 +1,3 @@
+Rails.application.routes.draw do
+  mount Webshims::Rails::Rewrite.new, :at => "/webshims/shims"
+end

lib/webshims-rails.rb

@@ -1,4 +1,6 @@
 require "webshims-rails/version"
+require "webshims-rails/view-helpers"
+require "webshims-rails/rewrite"
 
 module Webshims
   module Rails
@@ -12,6 +14,10 @@ class Engine < ::Rails::Engine
           app.config.assets.precompile << /webshims/
         end
       end
+
+      initializer "Webshims::Rails::ViewHelpers" do
+        ActiveSupport.on_load(:action_view) { include Webshims::Rails::ViewHelpers }
+      end
     end
   end
 end

lib/webshims-rails/rewrite.rb

@@ -0,0 +1,21 @@
+module Webshims
+  module Rails
+    class Rewrite < Rack::File
+
+      def initialize
+        super(root)
+      end
+
+      def call(env)
+        env["PATH_INFO"] = env["PATH_INFO"].gsub(%r(\A/[0-9.]+/), '')
+        super(env)
+      end
+
+      private
+
+      def root
+        File.join(Gem.loaded_specs["webshims-rails"].full_gem_path, "vendor", "assets", "javascripts", "webshims", "shims")
+      end
+    end
+  end
+end

lib/webshims-rails/view-helpers.rb

@@ -0,0 +1,9 @@
+module Webshims
+  module Rails
+    module ViewHelpers
+      def webshims_path
+        "/webshims/shims/#{Webshims::Rails::WEBSHIMS_VERSION}/"
+      end
+    end
+  end
+end