Replace Cheetah template with jinja2 (or add additional support for jinja2)

[domenkozar]

Rationale:

• buildout uses ${var} configuration syntax, same as Cheetah. Using jinja2, template output is {{ var }}, making less pain to develop templates
• Cheetah is not known as Jinja2

Replacing Cheetah would mean breaking backwards compatibility with ZopeSkel templates, but bright future. Another option would to be to additionally support Jinja2.

[claytron]

+1 for adding the support, and potentially making it the default down the line.

[domenkozar]

Also if we have jinja2, figure out how to generate jinja2 template with jinja2 :)

[miohtama]

Cheetah also has bugs which I couldn't get support or even hints how to fix them

[cewing]

As I remember, from my last foray down this particular rat-hole, Cheetah support comes from the depths of PasteScript, and no-one I know of wants to deal with that. Issue #6 in this same tracker talks of ridding ourselves of the PasteScript dependency altogether. This would be a great good. And it's likely the only way we will be able to add Jinja2 support.

Anyone want to take a look at this?

[domenkozar]

Exactly, lots of bugs come down from PasteScript that we can not address, so let's fix it open source way :) I am willing to pair up with somebody and do this together with #6 (maybe at the ploneconf2012?).

[domenkozar]

mr.bob does this already https://mrbob.readthedocs.org

For templer, this is going to be quite some work. Anyone? :)