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# frozen_string_literal: true
module Nanoc::Filters
# @api private
class GitLabKramdown < Nanoc::Filter
requires 'kramdown'
identifier :gitlab_kramdown
TOC_PATCH = <<~PATCH
* TOC
{:toc}
PATCH
PRODUCT_SUFFIX = /-(core|starter|premium|ultimate)(-only)?/.freeze
# Runs the content through [GitLab Kramdown](https://gitlab.com/brodock/gitlab_kramdown).
# Parameters passed to this filter will be passed on to Kramdown.
#
# @param [String] raw_content The content to filter
#
# @return [String] The filtered content
def run(raw_content, params = {})
params = params.dup
warning_filters = params.delete(:warning_filters)
with_toc = params.delete(:with_toc)
content = with_toc ? TOC_PATCH + raw_content : raw_content
document = ::Kramdown::Document.new(content, params)
update_anchors_with_product_suffixes!(document.root.children)
if warning_filters
r = Regexp.union(warning_filters)
warnings = document.warnings.reject { |warning| r =~ warning }
else
warnings = document.warnings
end
if warnings.any?
warn "\nkramdown warning(s) for #{@item_rep.inspect}"
warnings.each do |warning|
warn " #{warning}"
end
end
document.to_html
end
private
def update_anchors_with_product_suffixes!(elements)
headers = find_type_elements(:header, elements)
headers.each do |header|
next unless header.attr['id'].match(PRODUCT_SUFFIX)
remove_product_suffix!(header, 'id')
link = find_type_elements(:a, header.children).first
remove_product_suffix!(link, 'href') if link
end
end
def remove_product_suffix!(element, attr)
element.attr[attr] = element.attr[attr].gsub(PRODUCT_SUFFIX, '')
end
def find_type_elements(type, elements)
results = []
elements.each do |e|
results.push(e) if type == e.type
unless e.children.empty?
results.concat(find_type_elements(type, e.children))
end
end
results
end
end
end
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