Django 1.11 adds the ability to pass context processors in Jinja2
backend. Django also sends template_rendered signal in tests.
These two issues were the reason why we added Jinja2 backend, but
after upgrading to Django 1.11 we can remove it.
We still need jinja2/__init__.py, which modifies the environment,
and jinja2/compressors.py, which adds minify_js compressor.
Django started supporting context processors from version 1.11; as
a result of this, we can get rid of some of the code which is now
being taken care of by Django.
This makes our `zproject.jinja2.backend.Template` compatible with
Jinja2. After this change we don't need to override __init__ function
in Template class.
The only reason we now need to create our own Template class is that
we need to send template_rendered signals.
We need our own Jinja2 class because we need to maintain backward
compatibility with Django 1.10 and we need inject `debug` parameter.
If a Markdown macro contains Jinja2 template code, it isn't rendered
because render_markdown_path calls template.render on the including
.md file before the macro has been included. And then the including
.md file is converted to HTML. Therefore, the template code within
a Markdown macro (if any) never gets rendered and is returned as it is.
Now, after the source .md file is converted to HTML,
render_markdown_path renders the resulting HTML so that any template
code within included macros (if any) is finally rendered.
Django 1.10 has changed the implementation of this function to
match our custom implementation; in addition to this, we prefer
render().
Fixes#1914 via #4093.
`makemessages` escapes the `%` sign in `.po` files, but Jinja2 does
not unescape it while replacing the tranlation strings. In Jinja2,
there is an updated implementation of gettext available called
new-style gettext which handles escaping better; this commit switches
to using that.
Fixes#906.
This results in a substantial performance improvement for all of
Zulip's backend templates.
Changes in templates:
- Change `block.super` to `super()`.
- Remove `load` tag because Jinja2 doesn't support it.
- Use `minified_js()|safe` instead of `{% minified_js %}`.
- Use `compressed_css()|safe` instead of `{% compressed_css %}`.
- `forloop.first` -> `loop.first`.
- Use `{{ csrf_input }}` instead of `{% csrf_token %}`.
- Use `{# ... #}` instead of `{% comment %}`.
- Use `url()` instead of `{% url %}`.
- Use `_()` instead of `{% trans %}` because in Jinja `trans` is a block tag.
- Use `{% trans %}` instead of `{% blocktrans %}`.
- Use `{% raw %}` instead of `{% verbatim %}`.
Changes in tools:
- Check for `trans` block in `check-templates` instead of `blocktrans`
Changes in backend:
- Create custom `render_to_response` function which takes `request` objects
instead of `RequestContext` object. There are two reasons to do this:
1. `RequestContext` is not compatible with Jinja2
2. `RequestContext` in `render_to_response` is deprecated.
- Add Jinja2 related support files in zproject/jinja2 directory. It
includes a custom backend and a template renderer, compressors for js
and css and Jinja2 environment handler.
- Enable `slugify` and `pluralize` filters in Jinja2 environment.
Fixes#620.
Umair Khan
Eeshan Garg
Tim Abbott
Raghav Jajodia
anirudhjain75
Rafid Aslam
acrefoot