Class: ChromaSyntaxHighlighter

Inherits:
Asciidoctor::SyntaxHighlighter::Base
  • Object
show all
Defined in:
lib/asciidoctor-chroma.rb

Instance Method Summary collapse

Constructor Details

#initialize(*args) ⇒ ChromaSyntaxHighlighter

Returns a new instance of ChromaSyntaxHighlighter.



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# File 'lib/asciidoctor-chroma.rb', line 8

def initialize *args
  super
end

Instance Method Details

#chroma_available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/asciidoctor-chroma.rb', line 23

def chroma_available?
  @chroma_available ||= begin
    system('chroma', '--version', out: File::NULL, err: File::NULL)
    true
  rescue Errno::ENOENT
    false
  end
end

#format(node, lang, opts) ⇒ Object 



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# File 'lib/asciidoctor-chroma.rb', line 12

def format node, lang, opts
  if chroma_available?
    source = node.content
    highlighted = highlight(node, source, lang, opts)
    return "<div class=\"highlight\">#{highlighted}</div>"
  else
    raise "ChromaSyntaxHighlighter: 'chroma' command not found."
  end
  super
end

#highlight(node, source, lang, opts) ⇒ Object 



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# File 'lib/asciidoctor-chroma.rb', line 32

def highlight node, source, lang, opts
  Dir.chdir(Dir.mktmpdir) do
    output = IO.popen(['chroma', '--html', '--html-only', "--lexer=#{lang}"], 'r+') do |io|
      io.write(source)
      io.close_write
      io.read
    end
    raise "Chroma failed with status #{$?.exitstatus}" unless $?.success?
    return output
  end
end