Hi Bertrand, This looks a bit too magical to me :) All you're avoiding is a single include line, right? Or am I missing something?
You could also do the same thing (more or less) with a BindingsValuesProvider. Justin On Fri, Dec 6, 2013 at 11:40 AM, Bertrand Delacretaz <bdelacre...@apache.org> wrote: > Hi, > > From the funky prototypes department: I was talking to a colleague > this week about how to minimize the amount of code in presentation > templates, and we came up with the idea of having a setup script run > at the beginning of the request processing, to prepare values, > functions, iterators etc. for rendering scripts. > > I have created a prototype at > https://svn.apache.org/repos/asf/sling/whiteboard/bdelacretaz/request-context > - to play with it, install it, request > http://localhost:8080/apps/requestcontext.html and see the commented > scripts under /apps/requestcontext [2] > > Here's how this works: > > A Filter finds and executes the script that would process the same > request as the current one if it had the "setup" extension, before the > actual request processing takes place. > > In our example that's /apps/requestcontext/setup.ecma which contains things > like > > rc.u.title = "Here's the title for " + rc.path + ", computed at " + > new Date(); > > The rc object is our "request context", that provides easy access to > standard (rc.<name>) and freely defined user values (rc.u.<name>). > > You can then use the rc object in the rendering script, which in this > case would contain just > > <h1><%= rc.u.title %></h1> > > but the title building logic is neatly separated in its own script, > reusable, doesn't pollute rendering etc. > > This might be especially useful in the context of templating languages > like Sightly [1] that want to avoid code in rendering templates. > > The setup script can also play the role of a mini-controller, as it > can redirect, fail or forward the current request. > > My prototype doesn't require any changes to the Sling code, so we can > very keep that as an experimental extension for now, if we want to > move it out of the whiteboard. > > Feedback is welcome as usual. > > -Bertrand > > [1] > http://www.pro-vision.de/content/medialib/pro-vision/production/adaptto/2013/adaptto2013-sightly-gabriel-walt-honwai-wong-senol-tas-pdf/_jcr_content/renditions/rendition.file/adaptto2013-sightly-gabriel-walt-honwai-wong-senol-tas.pdf > > [2] > https://svn.apache.org/repos/asf/sling/whiteboard/bdelacretaz/request-context/src/main/resources/SLING-CONTENT/apps/requestcontext
