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# Using Opal with Sinatra
Add Opal to your Gemfile (or install using `gem`):
```ruby
# Gemfile
gem 'sinatra'
gem 'opal', '~> 0.6.2'
```
Opal uses `sprockets` as its default build system, so the asset-pipeline
from rails can be mimicked here to map all ruby assets in the `/assets`
path to be compiled using opal.
## Basic Application
```ruby
# config.ru
require 'opal'
require 'sinatra'
opal = Opal::Server.new {|s|
s.append_path 'app'
s.main = 'application'
}
map opal.source_maps.prefix do
run opal.source_maps
end
map '/assets' do
run opal.sprockets
end
get '/' do
<<-HTML
<!doctype html>
<html>
<head>
<script src="/assets/application.js"></script>
</head>
</html>
HTML
end
run Sinatra::Application
```
This creates a simple sprockets instance under the `/assets` path. Opal
uses a set of load paths to compile assets using sprockets. The
`Opal::Environment` instance is a simple subclass of `Sprockets::Environment`
with all the custom opal paths added automatically.
This `env` object includes all the opal corelib and stdlib paths. To add
any custom application directories, you must add them to the load path using
`env.append_path`. You can now add an `app/application.rb` file into this
added path with some basic content:
```ruby
# app/application.rb
require 'opal'
puts "wow, running ruby!"
```
It is necessary to require the opal corelib (seen in the `require` call) above.
This just makes the Opal runtime and corelib available. Then it is possible to
use all the corelib methods and classes, e.g. `Kernel#puts` as seen above.
### Running Application
As this is just a simple sinatra application, you can run it:
```sh
$ bundle exec rackup
```
And point your browser towards `http://localhost:9292/` and view the browser
debug console. You should see this message printed.
Version data entries
31 entries across 31 versions & 1 rubygems