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  1. require "yaml"
  2.  
  3. YAML_FRONT_MATTER_REGEXP = /\A(---\s*\n.*?\n?)^((---|\.\.\.)\s*$\n?)/m
  4.  
  5. def update_data(data)
  6.   data.merge("A" => 2)
  7. end
  8.  
  9. if $stdin.read =~ YAML_FRONT_MATTER_REGEXP
  10.   data, content = YAML.load($1), Regexp.last_match.post_match
  11.   data = update_data(data)
  12.   YAML.dump(data, $stdout)
  13.   $stdout.puts("---", content)
  14. end
Success #stdin #stdout 0.1s 11472KB
comments (?)
stdin
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---
A: 1
---
# Title
Words. More words. This is the words part of the file.
stdout
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---
A: 2
---
# Title
Words. More words. This is the words part of the file.
https://ideone.com/gwzuDH
language:
Ruby (ruby 2.5.5)
created:
9 years ago
visibility:
secret

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