Whitespace control isn't supported

[yorickpeterse]

Handlebars allows you to control the whitespace as described in https://handlebarsjs.com/guide/expressions.html#whitespace-control. This however isn't supported by this Gem. For example, this template:

{{#each numbers as |number| ~}}
Number: {{number}}
{{/each}}

Will produce an error along the lines of:

Traceback (most recent call last):
        4: from /tmp/bench.rb:24:in `<main>'
        3: from /home/yorickpeterse/.gem/ruby/2.7.2/gems/ruby-handlebars-0.4.0/lib/ruby-handlebars.rb:22:in `compile'
        2: from /home/yorickpeterse/.gem/ruby/2.7.2/gems/ruby-handlebars-0.4.0/lib/ruby-handlebars.rb:63:in `template_to_ast'
        1: from /home/yorickpeterse/.gem/ruby/2.7.2/gems/parslet-1.8.2/lib/parslet/atoms/base.rb:49:in `parse'
/home/yorickpeterse/.gem/ruby/2.7.2/gems/parslet-1.8.2/lib/parslet/cause.rb:70:in `raise': Extra input after last repetition at line 1 char 1. (Parslet::ParseFailed)

[yorickpeterse]

@vincent-psarga @mloewinger74 Not sure who the right people to ping are. At GitLab we're looking into using Handlebars for generating user changelogs (see https://gitlab.com/gitlab-org/gitlab/-/merge_requests/50063#note_480180915 and the discussion that follows). But for this we need whitespace control as we're outputting Markdown, not e.g. HTML.

I took a brief look, but I'm not sure how to implement this myself. Would it be possible to add support for controlling whitespace? Thanks! 😄

[joegaudet]

+1 would love support on this.