Awesome

Rack::Polymer

NO LONGER UNDER DEVELOPMENT, obvs.

Polymer CDN script tags and fallback in one neat package. Current version is for Polymer v0.0.20130816 (or if you're reading this in the source and that number doesn't display, look in the lib/rack/polymer/version.rb file).

Build status

Master branch:

Why?

Because then I don't have to worry about versioning or fallback.

Installation

Add this line to your application's Gemfile:

gem 'rack-polymer'

And then, from a command-line, execute:

bundle install

Or even better:

bundle install --binstubs --path vendor

Or install it yourself as:

gem install rack-polymer -r

Usage

In your rackup file or Sinatra class (or wherever you like to set up Rack middleware…)

use Rack::Polymer

Then wherever you need the script loaded (like in a layout file):

Rack::Polymer.cdn( env )

That's it. There are more options, check the docs.

Contributing

If you're going to change the code:

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

You can also help by informing me of CDNs that are hosting it and/or releases of the Polymer library. Just add an issue.

Version numbers

This library uses semver to version the library. That means the library version is not an indicator of quality but a way to manage changes. The version of Polymer can be found in the lib/rack/polymer/version.rb file, or via the {Rack::Polymer::POLYMER_VERSION} constant.

On top of that, version numbers will also change when new releases of Polymer are supported.

• If Polymer makes a major version jump, then this library will make a minor jump. That is because the API for the library has not really changed, but it is possibly a change that will break things.
• If Polymer makes a minor version jump, then so will this library, for the same reason as above.
• I doubt point releases will be followed, but if so, it will also precipitate a minor jump in this library's version number. That's because even though Polymer feel it's a point release, I'm not them, my responsibility is to users of this library and I'll take the cautious approach of making it a minor version number change.

As an example, if the current library version was 1.0.0 and Polymer was at 2.0.0 and I made a change that I felt was major and breaking (to the Ruby library), I'd bump Rack::Polymer's version to 2.0.0. That the version numbers match between Rack::Polymer and the Polymer script is of no significance, it's just coincidental.
If then Polymer went to v2.1.0 and I decided to support that, I'd make the changes and bump Rack::Polymer's version to 2.1.0. That the version numbers match between Rack::Polymer and the Polymer script is of no significance, it's just coincidental.
If then I made a minor change to the library's API that could be breaking I'd bump it to 2.2.0.
If I then added some more instructions I'd bump Rack::Polymer's version to 2.2.1.
If then Polymer released version 3.0.0, I'd add it to the library, and bump Rack::Polymer's version to 2.3.0.

Only one version of Polymer will be supported at a time. This is because the fallback script is shipped with the gem and I'd like to keep it as light as possible. It's also a headache to have more than one.

So basically, if you want to use a specific version of Polymer, look for the library version that supports it via the {Rack::Polymer::POLYMER_VERSION} constant. Don't rely on the version numbers of this library to tell you anything other than compatibility between versions of this library.

Licences

The licence for this library can be found in the LICENCE.txt file. The licence for parts taken from the Polymer library (like the fallback script, bits for examples and specs etc) is to be found in the Polymer-LICENSE file.