Class: Jekyll::Diagrams::GraphvizRenderer

Inherits:
Object
  • Object
show all
Defined in:
lib/jekyll/diagrams/graphviz.rb

Constant Summary collapse

DEFAULTS = 
{
  'engine'  => 'dot',
  'options' => '-Tsvg'
}

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ GraphvizRenderer

Returns a new instance of GraphvizRenderer.



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# File 'lib/jekyll/diagrams/graphviz.rb', line 42

def initialize(config)
  @config = DEFAULTS.merge(config)
end

Instance Method Details

#render(code, engine = DEFAULTS['engine']) ⇒ Object 



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# File 'lib/jekyll/diagrams/graphviz.rb', line 46

def render(code, engine = DEFAULTS['engine'])
  cmd = "#{@config['engine']} #{@config['options']}"
  svg, status = Open3.capture2(
    cmd,
    stdin_data: code,
    binmode: true
  )

  if !status.success?
    raise "Non-zero exit status '#{cmd}': #{status}"
  end

  svg.sub! /^<!DOCTYPE(([^>]|\n)*)>(\n?)/, ''
  svg.force_encoding 'UTF-8'

  "<div class='graphviz'>#{svg}</div>"
end