A simple asset timestamping solution. Adapted from asset timestamping functionality in ActionPack.
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README.md

AssetTimestampsCache

A simple asset timestamping solution. Adapted from asset timestamping functionality in ActionPack.

Allows you to set far-future expires headers on images, stylesheets, javascripts, flash etc. and bust the browser's cache only when the file has changed.

For more on far-future expires headers, see http://developer.yahoo.com/performance/rules.html#expires

View Helper

AssetTimestampsCache::ViewHelper contains an timestamped_asset_path method, which appends a timestamp of the file's last modified time to the asset path.

So,

<%= timestamped_asset_path "images/logo.png" %>

will output:

"images/logo.png?1267564623"

This timestamp value is cached, so that subsequent calls don't need to hit the filesystem.

Sinatra setup example:

class MyApp < Sinatra::Base
  helper AssetTimestampsCache::ViewHelper

  # etc...
end

Direct Cache Access

# Will look for "public/images/log.png" and get last modified time.
# Subsequent lookups will read from internal hash cache instead of filesystem
AssetTimestampsCache["images/logo.png"] # => "1267564623"

# Change asset directory from default of "public"
AssetTimestampsCache.asset_dir = 'assets'

# Clear cache
AssetTimestampsCache.clear

Caveat: NOT THREADSAFE. This shouldn't be a problem if you're deploying to Passenger. One could always add a Mutex around cache writes (as ActionPack does) if thread safety is an issue.