Export push_partial_block and pop_partial_block

[mkantor]

This allows custom helpers to manipulate the @partial-block variable.

[sunng87]

May I know your use case for this? Since @partial-block is an internal mechanism in handlebars. Exposing these API may allow developers to change its meaning of it

[mkantor]

Exposing these API may allow developers to change its meaning of it

That's my goal. 😄

I have a custom helper that can render other handlebars templates (with additional functionality), and want to set @partial-block so it behaves more like > (mkantor/operator#10 (comment)).

Here's the commit where I'd like to use push_partial_block: mkantor/operator@bd80936#diff-6d2087fee5a1b9f51fa4201717f8bbc6abea61b7a185437a0bb50da97bb00c0e

[sunng87]

@mkantor Thanks for your clarification. How about using set_partial from RenderContext to register the template as a partial in your helper? The only drawback I think is you cannot use @partial-block this way but it makes sense because @partial-block has it own meaning within handlebars system.

[mkantor]

@sunng87 Sorry for the slow response!

How about using set_partial from RenderContext to register the template as a partial in your helper? The only drawback I think is you cannot use @partial-block this way

I could use set_partial with a different name (that's what I did while prototyping), but I was hoping to specifically use @partial-block to make it easier to migrate between > and my get helper. My goal is to not require any changes in the included template when you do that.

@partial-block has it own meaning within handlebars system

To me this doesn't feel much different from a helper that sets variables like @index or @key, but I may be missing something.

For what it's worth handlebars.js allows this (there it's much worse because the global Handlebars object gets mutated).

[coveralls]

coverage: 81.924%. remained the same
when pulling 943a75e on mkantor:custom-helpers-can-change-partial-block
into 6055df6 on sunng87:master.