* Disable rendering of tag based on register
* Improvements to disable tag
* Resolve disbale tag tests
* Test disable_tags register
* disabled_tags is now always avaiable
* Allow multiple tags to be disabled at once
* Move disabled check to block_body
* Code improvements
* Remove redundant nil check
* Improve disabled tag error output
* Improve disable tag API
* Code improvements
* Switch disabled? to not mutate output
* Fix array handling shortcut in disable_tags
Example:
```
// the_count.liquid
{{ number }}! Ah ah ah.
// my_template.liquid
{% for number in range (1..3) %}
{% render "the_count", number: number %}
{% endfor %}
Output:
1! Ah ah ah.
2! Ah ah ah.
3! Ah ah ah.
```
The `render` tag is a more strict version of the `include` tag. It is
designed to isolate itself from the parent rendering context both by
creating a new scope (which does not inherit the parent scope) and by
only inheriting "static" registers.
Static registers are those that do not hold mutable state which could
affect rendering. This again helps `render`ed templates remain entirely
separate from their calling context.
Unlike `include`, `render` does not permit specifying the target
template using a variable, only a string literal. For example, this
means that `{% render my_dynamic_template %}` is invalid syntax. This
will make it possible to statically analyze the dependencies between
templates without making Turing angry.
Note that the `static_environment` of a rendered template is inherited, unlike
the scope and regular environment. This environment is immutable from within the
template.
An alternate syntax, which mimics the `{% include ... for %}` tag is
currently in design discussion.
When including a template which is not defined, the exception raised is
*undefined method `split` for nil:NilClass*
This occurs for a scenario like the following:
`{% include nil %}`
or
`{% include undefined-var %}`
Making the code raise an argument error to allow better understanding of
the include error
That pull request broke raw tags with open variable tags. E.g.
{% raw %}
{{
{% endraw %}
{{ 1 }}
This reverts commit fbaabf3b59, reversing
changes made to af24d2c2ab.
