Asset path helpers for Sprockets 2.x applications
Sprockets::Helpers adds the asset_path helpers, familiar to Rails developers, to Sprockets 2.x assets and applications.
- Includes helpers for image, javascript, stylesheet, font, video, & audio assets.
- Automatically appends extension if necessary.
- Optionally outputs digest paths.
- Falls back to file paths in the public directory & adds cache busting timestamp.
$ gem install sprockets-helpersLet's build a simple Sinatra app using Sprockets and Sprockets::Helpers (See my fork of sinatra-asset-pipeline for complete setup):
require 'sinatra/base'
require 'sprockets'
require 'sprockets-helpers'
class App < Sinatra::Base
set :sprockets, Sprockets::Environment.new(root)
set :assets_prefix, '/assets'
set :digest_assets, false
configure do
# Setup Sprockets
sprockets.append_path File.join(root, 'assets', 'stylesheets')
sprockets.append_path File.join(root, 'assets', 'javascripts')
sprockets.append_path File.join(root, 'assets', 'images')
# Configure Sprockets::Helpers (if necessary)
Sprockets::Helpers.configure do |config|
config.environment = sprockets
config.prefix = assets_prefix
config.digest = digest_assets
config.public_path = public_folder
end
end
helpers do
include Sprockets::Helpers
# Alternative method for telling Sprockets::Helpers which
# Sprockets environment to use.
# def assets_environment
# settings.sprockets
# end
end
get '/' do
erb :index
end
endSimply requiring sprockets-helpers will add the asset path helpers to the Sprocket context, making them available within any asset. For example, a file assets/javascripts/paths.js.erb:
var Paths = { railsImage: "<%= image_path 'rails.png' %>" };
Would be transformed into:
var Paths = { railsImage: '/assets/rails.png' };The helpers can also be used in the app itself. You just include the Sprockets::Helpers module and set Sprockets::Helpers.environment to the Sprockets environment to search for the assets. Alternatively you can define an #assets_environment method in the context of #asset_path, which returns a reference to the Sprockets environment (see above).
Now the following index file:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Sinatra with Sprockets 2 (Asset Pipeline)</title>
<link rel="stylesheet" href="<%= stylesheet_path 'application' %>">
<script src="<%= javascript_path 'application' %>"></script>
</head>
<body>
<img src="<%= image_path 'rails.png' %>">
</body>
</html>Would become:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Sinatra with Sprockets 2 (Asset Pipeline)</title>
<link rel="stylesheet" href="/assets/application.css">
<script src="/assets/application.js"></script>
</head>
<body>
<img src="/assets/rails.png">
</body>
</html>If the source is not an asset in the Sprockets environment, Sprockets::Helpers will fallback to looking for the file in the application's public directory. It will also append the cache busting timestamp of the file. For example:
Given an image, public/images/logo.jpg:
<img src="<%= image_path 'logo.jpg' %>">Would become:
<img src='/images/logo.jpg?1320093919'>New in 0.4: Sprockets::Helpers will use the latest fingerprinted filename directly from a manifest.json file:
# ...
Sprockets::Helpers.configure do |config|
config.environment = sprockets
config.manifest = Sprockets::Manifest.new(sprockets, 'path/to/manifset.json')
config.prefix = assets_prefix
config.public_path = public_folder
end
# ...Copyright (c) 2011 Peter Browne. See LICENSE for details.