README.md in rack-mogilefs-0.1.1 vs README.md in rack-mogilefs-0.1.2

@@ -1,30 +1,34 @@
-# Rack middleware/endpoint for serving MogileFS files
+# rack-mogilefs
 
+If you are using Nginx you'll probably want to serve MogileFS files with
+the [MogileFS Module](http://www.grid.net.ru/nginx/mogilefs.en.html), but if
+you need to serve them out of a Rack app, this should help.
+
 ## Getting Started:
 
 First install the gem:
 
     gem install rack-mogilefs
 
 There are a variety of ways to use it:
 
 ### Rack middleware
     # (config.ru)
-    use Rack::MogileFS, :path => %r{^/system/*}
+    use Rack::MogileFS, :path => %r{^/assets/*}
 
 ### Rails 3:
 
     # (config/routes.rb)
-    match "/system/*" => Rack::MogileFS::Endpoint.new
+    match "/assets/*" => Rack::MogileFS::Endpoint.new
 
 ### Rails 2:
 
-    # (app/metal/mogilefs.rb)
-    class MogileFSMetal
+    # (app/metal/mogilefs_metal.rb)
+    class MogilefsMetal
       def self.call(env)
-        if env["PATH_INFO"] =~ %r{^/system/*}
+        if env["PATH_INFO"] =~ %r{^/assets/*}
           Rack::MogileFS::Endpoint.new.call(env)
         else
           [ 404, { "Content-Type" => "text/html" }, ["Not Found"] ]
         end
       end
@@ -34,14 +38,23 @@
 
 `Rack::MogileFS` uses the request path (`PATH_INFO`) for the MogileFS key. The
 content type of the file is detected by the extension, using the `mime-types`
 gem.
 
+If you want to customize the mapping of the PATH_INFO string to a MogileFS key
+you can provide a mapper proc (or anything that responds to call) like this:
+
+    # map '/assets/filename.gif' to the mogilefs key 'filename.gif'
+    # Rack::MogileFS and Rack::MogileFS::Endpoint take the same options
+    use Rack::MogileFS,
+      :path   => %r{^/assets/*},
+      :mapper => lambda { |path| path.sub('/assets/', '') }
+
 ## Configuration
 
-By default will look for a yaml config in `config/mogilefs.yml` that looks
-like this:
+If `Rack::MogileFS` detects it is inside a Rails app, it will look for a yaml
+config in `config/mogilefs.yml` that looks like this:
 
     development:
       connection:
         domain: "development.myapp.com"
         hosts:
@@ -50,10 +63,10 @@
       class: "file"
     staging:
       ...
 
 
-and initialize a mogilefs client like this:
+and initialize a MogileFS client like this:
 
     config = YAML.load_file( Rails.root.join("config/mogilefs.yml") )[Rails.env]
     MogileFS::MogileFS.new( config["connection"].symbolize_keys )
 
 You can override this by passing in a MogileFS client of your own:
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