Extend with tag to support multiple bindings

[eibaan]

Attached is a patch that extends the with template tag in a fully backward compatible way (I hope) so that you can write

{% with expr1 as var1 and expr2 as var2 and expr3 as var3 %} ...

instead of

{% with expr1 as var1 %}
    {% with expr2 as var2 %}
        {% with expr3 as var3 %}
            ...

[Johannes Dollinger]

duplicate of #7817.

[Antti Kaihola]

I attached eibaan's patch above​ with slight improvements to #7817.

[Chris Beaven]

#7817 dealt with two separate feature requests here, one for {% with %} and one for {% include %}.

I'm leaving that one to deal with just {% include %} and reopening this one to track {% with %}

[Łukasz Rekucki]

Ok, I'm goning to split the with part form #7817. It's diffrent from patch on this ticket, that it resolves all variables in the outer context, so you can do

  {% with x as y and y as x %}{% endwith %}

to swap the variables. It's also with line how Python does assignment and how most languages handle "let" statement (which I find very similar in semantic to the with tag).

[Łukasz Rekucki]

Patch from #7817, but only has "with" related stuff.

[Russell Keith-Magee]

Following a ​BDFL pronouncement, this has been accepted, using the {% with foo=x bar=y %} syntax. Related ticket: #7817.

[Chris Beaven]

(In [14922]) Fixes #7817 and #9456.

• The include tag now has a 'with' option to include to provide extra context vairables to the included template.

• The include tag now has an 'only' option to exclude the current context when rendering the included template.

• The with tag now accepts multiple variable assignments.

• The with, include and blocktrans tags now use a new keyword argument format for variable assignments (e.g. {% with foo=1 bar=2 %}).

[Jacob]

Milestone 1.3 deleted