Module: Snibbets::Highlight

Defined in:
lib/snibbets/highlight.rb

Class Method Summary collapse

Class Method Details

.highlight(code, filename, syntax, theme = nil) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 79

def highlight(code, filename, syntax, theme = nil)
  unless $stdout.isatty
    return Snibbets.options[:all_notes] && code.replace_blocks[0].notes? ? code : code.clean_code
  end

  return highlight_fences(code, filename, syntax) if code.fenced?

  theme ||= Snibbets.options[:highlight_theme] || 'monokai'
  syntax ||= Lexers.syntax_from_extension(filename)
  syntax = Lexers.normalize_lexer(syntax)

  return code if ['text'].include?(syntax)

  skylight = TTY::Which.which('skylighting')
  pygments = TTY::Which.which('pygmentize')
  shiki = TTY::Which.which('shiki')

  if Snibbets.options[:highlighter] =~ /^shiki/ && !shiki.nil?
    shiki_theme = Snibbets.options[:highlight_theme] || 'vitesse-dark'
    return highlight_shiki(shiki, code, syntax, shiki_theme)
  elsif Snibbets.options[:highlighter] =~ /^s/ && !skylight.nil?
    if !Lexers.skylight_lexer?(syntax) && !pygments.nil?
      return highlight_pygments(pygments, code, syntax, 'monokai')
    else
      return highlight_skylight(skylight, code, syntax, theme)
    end
  elsif Snibbets.options[:highlighter] =~ /^p/ && !pygments.nil?
    return highlight_pygments(pygments, code, syntax, theme)
  elsif !skylight.nil?
    return highlight_skylight(skylight, code, syntax, theme)
  elsif !pygments.nil?
    return highlight_pygments(pygments, code, syntax, theme)
  elsif !shiki.nil?
    shiki_theme = Snibbets.options[:highlight_theme] || 'vitesse-dark'
    return highlight_shiki(shiki, code, syntax, shiki_theme)
  end

  code
end

.highlight_fences(code, filename, syntax) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 66

def highlight_fences(code, filename, syntax)
  content = code.dup

  content.fences.each do |f|
    rx = Regexp.new(Regexp.escape(f[:code]))
    syn = Lexers.normalize_lexer(f[:lang] || syntax)
    highlighted = highlight(f[:code].gsub(/\\k</, '\k\<'), filename, syn).strip
    code.sub!(/#{rx}/, highlighted)
  end

  Snibbets.options[:all_notes] ? code.gsub(/k\\</, 'k<') : code.gsub(/k\\</, 'k<').clean_code
end

.highlight_pygments(executable, code, syntax, theme) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 15

def highlight_pygments(executable, code, syntax, theme)
  syntax = syntax.nil? || syntax.empty? ? '-g' : "-l #{syntax}"
  theme = theme.nil? || theme.empty? ? '' : ",style=#{theme}"
  command = "#{executable} -O full#{theme} #{syntax}"
  fallback = "#{executable} -O full#{theme} -g"
  run_command_with_input(command, input: code, fallback: fallback)
end

.highlight_shiki(executable, code, syntax, theme) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 43

def highlight_shiki(executable, code, syntax, theme)
  theme ||= 'vitesse-dark'
  tempfile = Tempfile.new(['snibbets', '.tmp'])
  begin
    tempfile.write(code)
    tempfile.close

    command_parts = [executable, '--format', 'ansi']
    command_parts << '--theme' << theme unless theme.nil? || theme.empty?
    command_parts << '--lang' << syntax unless syntax.nil? || syntax.empty?
    command_parts << tempfile.path

    stdout, _stderr, status = Open3.capture3(*command_parts)
    if status.success?
      stdout
    else
      code
    end
  ensure
    tempfile&.unlink
  end
end

.highlight_skylight(executable, code, syntax, theme) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 23

def highlight_skylight(executable, code, syntax, theme)
  theme ||= 'nord'
  theme_file = if theme =~ %r{^[/~].*?(\.theme)?$}
                 theme = theme.sub(/(\.theme)?$/, '.theme')
                 File.expand_path(theme)
               else
                 theme = theme.sub(/\.theme$/, '')
                 File.join(__dir__, '..', 'themes', "#{theme}.theme")
               end

  theme = if File.exist?(theme_file)
            "-t #{theme_file} "
          else
            ''
          end
  return code if syntax.nil? || syntax.empty? || !Lexers.skylight_lexer?(syntax)

  run_command_with_input("#{executable} #{theme}--syntax #{syntax}", input: code)
end

.run_command_with_input(*cmd, input: nil, fallback: nil) ⇒ Object 



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# File 'lib/snibbets/highlight.rb', line 4

def run_command_with_input(*cmd, input: nil, fallback: nil)
  stdout, _stderr, status = Open3.capture3(*cmd, stdin_data: input)
  if status.success?
    stdout
  elsif fallback.nil?
    input
  else
    run_command_with_input(fallback, input: input, fallback: nil)
  end
end