Class: Jekyll::Spaceship::PlantUMLProcessor

Inherits:
Processor
  • Object
show all
Defined in:
lib/jekyll-spaceship/processors/plantuml-processor.rb

Instance Method Summary collapse

Methods inherited from Processor

#content_tag, #initialize, register, #register

Constructor Details

This class inherits a constructor from Jekyll::Spaceship::Processor

Instance Method Details

#handle_plantuml(code) ⇒ Object 



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# File 'lib/jekyll-spaceship/processors/plantuml-processor.rb', line 36

def handle_plantuml(code)
  # wrap plantuml code
  uml = "@startuml#{code}@enduml"

  dir = File.dirname(__FILE__)
  jar = dir + "/../utils/plantuml/plantuml.jar"
  echo = "echo -e \"#{uml.gsub('"', '\"')}\""
  plantuml = "java -jar \"#{jar}\" -pipe 2>/dev/null"

  # exec plantuml.jar and output base64 data
  base64 = `#{echo} | #{plantuml} | base64`

  # return img tag
  "<img src=\"data:image/png;base64, #{base64}\">"
end

#on_posts_pre_render(post) ⇒ Object 



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# File 'lib/jekyll-spaceship/processors/plantuml-processor.rb', line 7

def on_posts_pre_render(post)
  # match default plantuml block and code block
  pattern = Regexp.union(
    /(\\?@startuml((?:.|\n)*?)@enduml)/,
    /(`{3}\s*plantuml((?:.|\n)*?)`{3})/
  )

  post.content.scan pattern do |match|
    match = match.select { |m| not m.nil? }
    block = match[0]
    code = match[1]

    # skip escape default plantuml block
    if block.match? /(^\\@startuml|\\@enduml$)/
      next
    end

    Logger.log "handle plantuml block - #{post.path.gsub(/.*_posts\//, '')}"

    post.content = post.content.gsub(
      block,
      handle_plantuml(code)
    )
  end

  # handle escape default plantuml block
  post.content = post.content.gsub(/\\(@startuml|@enduml)/, '\1')
end