Right now, I put the Piwik code at the end of html.tpl.php.
How I can integrate it in a Drupal site, so that this JavaScript can be aggregated? Or better loaded and keep my template clean?
Can I put this code to an external JavaScript file (+ how?) and then just declare it at theme.info?
Even better, use the drupal module that does all the hard work - Piwik Web Analytics.
Here is a quote about it (from the module's project page):
... Adds the Piwik web statistics tracking system to your website.
The module allows you to add the following statistics features to your site:
- Single/multi domain tracking
- Selectively track/exclude certain users, roles and pages
- Monitor what type of links are tracked (downloads, outgoing and mailto)
- Monitor what files are downloaded from your pages
- Cache the Piwik code on your local server for improved page loading times
- Custom variables support with tokens (D7 only)
- Custom code snippets
- Site Search
- Drupal messages tracking
- Modal dialog tracking (Colorbox)
- Access denied (403) and Page not found (404) tracking
- User ID tracking across devices
- DoNotTrack support
