diff options
Diffstat (limited to 'lib/banzai/filter/yaml_front_matter_filter.rb')
-rw-r--r-- | lib/banzai/filter/yaml_front_matter_filter.rb | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/banzai/filter/yaml_front_matter_filter.rb b/lib/banzai/filter/yaml_front_matter_filter.rb new file mode 100644 index 00000000000..e4e2f3f228d --- /dev/null +++ b/lib/banzai/filter/yaml_front_matter_filter.rb @@ -0,0 +1,28 @@ +require 'html/pipeline/filter' +require 'yaml' + +module Banzai + module Filter + class YamlFrontMatterFilter < HTML::Pipeline::Filter + DELIM = '---'.freeze + + # Hat-tip to Middleman: https://git.io/v2e0z + PATTERN = %r{ + \A(?:[^\r\n]*coding:[^\r\n]*\r?\n)? + (?<start>#{DELIM})[ ]*\r?\n + (?<frontmatter>.*?)[ ]*\r?\n? + ^(?<stop>#{DELIM})[ ]*\r?\n? + \r?\n? + (?<content>.*) + }mx.freeze + + def call + match = PATTERN.match(html) + + return html unless match + + "```yaml\n#{match['frontmatter']}\n```\n\n#{match['content']}" + end + end + end +end |