Class: Jekyll::Latex::Pdf::Tikz::TikzHtml

Inherits:
Liquid::Block
  • Object
show all
Includes:
TikzUtils, Utilities
Defined in:
lib/jekyll/latex/pdf/tikz/html.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods included from TikzUtils

#parse_markup

Methods included from Utilities

#nomarkdown, #nomarkdown_p, #run_cmds, #set_context_to

Constructor Details

#initialize(tag_name, markup, tokens) ⇒ TikzHtml

Returns a new instance of TikzHtml.



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# File 'lib/jekyll/latex/pdf/tikz/html.rb', line 38

def initialize(tag_name, markup, tokens)
  super
  parse_markup(markup)

  @header = <<-'END'
        \documentclass{standalone}
        \usepackage{tikz}
  END

  # @header += "\\usetikzlibrary{#{@params['library']}}\n" if @params.key?("library")
  @header += TikzLibraries.render

  @header += <<-'END'
        \begin{document}
        \begin{tikzpicture}
  END

  @footer = <<-'END'
        \end{tikzpicture}
        \end{document}
  END

  @config = Defaults.defaults.dup
end

Instance Attribute Details

#config ⇒ Object (readonly)

Returns the value of attribute config.



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# File 'lib/jekyll/latex/pdf/tikz/html.rb', line 36

def config
  @config
end

#site ⇒ Object (readonly)

Returns the value of attribute site.



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# File 'lib/jekyll/latex/pdf/tikz/html.rb', line 36

def site
  @site
end

Instance Method Details

#render(context) ⇒ Object 



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# File 'lib/jekyll/latex/pdf/tikz/html.rb', line 63

def render(context)
  set_context_to context

  tikz_code = @header + super + @footer
  md5, old_md5 = false, false

  tmp_directory = File.join(Dir.pwd,
                            @site.config["pdf"]["latex_cache_path"],
                            "tikz",
                            File.basename(context["page"]["url"], ".*"))
  FileUtils.mkdir_p tmp_directory

  dest_directory = File.join(Dir.pwd, @site.config["pdf"]["tikz_path"], File.basename(context["page"]["url"], ".*"))
  FileUtils.mkdir_p dest_directory

  # use new filename if content has changed.
  if @site.config["pdf"]["tikz_md5"]
    # add it to file name.
    md5 = Digest::MD5.hexdigest(tikz_code).to_s

    md5_filename = File.join(tmp_directory, "md5.txt")

    old_md5 = File.open(md5_filename, 'r').read if File.exist? md5_filename
    old_filename = @file_name + "_#{old_md5}"

    unless old_md5.eql? md5
      FileUtils.rm_rf(Dir.glob(File.join(tmp_directory, "*")))
      svg_path = File.join(dest_directory, "#{old_filename}.svg")
      png_path = File.join(dest_directory, "#{old_filename}.png")
      FileUtils.rm(svg_path) if File.exist? svg_path
      FileUtils.rm(png_path) if File.exist? png_path
    end

    @file_name += "_#{md5}"

    File.open(md5_filename, 'w') {|file| file.write(md5.to_s) }
  end

  tex_path = File.join(tmp_directory, "#{@file_name}.tex")
  pdf_path = File.join(tmp_directory, "#{@file_name}.pdf")

  svg_path = File.join(dest_directory, "#{@file_name}.svg")
  png_path = File.join(dest_directory, "#{@file_name}.png")

  # if the file doesn't exist or the tikz code is not the same with the file, then compile the file
  if !File.exist?(tex_path) || !tikz_same?(tex_path, tikz_code) ||
      !File.exist?(svg_path) || !File.exist?(png_path)
    File.open(tex_path, 'w') {|file| file.write(tikz_code.to_s) }
    cmds = [[@site.config["pdf"]["pdf_engine"],
             "--interaction=batchmode",
             "--output-format=pdf", tex_path],
            ["pdf2svg", pdf_path, svg_path],
            ["gm", "convert", svg_path, "-quality", "90", png_path]]

    run_cmds cmds, tmp_directory
  end

  web_svg_path = File.join(@site.config["pdf"]["tikz_path"],
                           File.basename(context["page"]["url"], ".*"),
                           "#{@file_name}.svg")
  web_png_path = File.join(@site.config["pdf"]["tikz_path"],
                           File.basename(context["page"]["url"], ".*"),
                           "#{@file_name}.png")
  "\n<object data=\"/#{web_svg_path}\" type=\"image/svg+xml\">" \
    "<img src=\"/#{web_png_path}\" />" \
    "</object>\n"
end