Class: Softcover::Builders::Html

Inherits:
Softcover::Builder show all
Includes:
Utils
Defined in:
lib/softcover/builders/html.rb

Constant Summary

Constants included from Utils

Utils::UNITS

Instance Attribute Summary

Attributes inherited from Softcover::Builder

#built_files, #manifest

Instance Method Summary collapse

Methods included from Utils

#add_highlight_class!, #as_size, #book_txt_lines, #chapter_label, #commands, #current_book, #dependency_filename, #digest, #executable, #execute, #in_book_directory?, #language_labels, #linux?, #logged_in?, #master_content, #master_filename, #master_latex_header, #mkdir, #os_x?, #path, #raw_lines, #reset_current_book!, #rm, #silence, #source, #tmpify, #unpublish_slug, #write_master_latex_file, #write_pygments_file

Methods inherited from Softcover::Builder

#build!, #initialize

Constructor Details

This class inherits a constructor from Softcover::Builder

Instance Method Details

#build(options = {}) ⇒ Object 



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# File 'lib/softcover/builders/html.rb', line 21

def build(options = {})
  if Softcover::profiling?
    require 'ruby-prof'
    RubyProf.start
  end

  write_master_latex_file(manifest)

  if manifest.markdown?
    unless options[:'find-overfull']
      remove_unneeded_polytex_files
    end
    manifest.chapters.each do |chapter|
      write_latex_files(chapter, options)
    end

    # Reset the manifest to use PolyTeX.
    self.manifest = Softcover::BookManifest.new(source: :polytex,
                                                verify_paths: false,
                                                origin: :markdown)
  end

  if manifest.polytex?
    basename = File.basename(manifest.filename, '.tex')
    @html  = converted_html(basename)
    @title = basename
    erb_file = File.read(File.join(File.dirname(__FILE__),
                                   '..', 'server', 'views',
                                   'book.html.erb'))
    file_content = ERB.new(erb_file).result(binding)
    write_full_html_file(basename, file_content)
    write_chapter_html_files(Nokogiri::HTML(file_content), erb_file)
  end

  if Softcover::profiling?
    result = RubyProf.stop
    printer = RubyProf::GraphPrinter.new(result)
    printer.print(STDOUT, {})
  end

  true
end

#build_target_cache(xml) ⇒ Object

Builds a cache of targets for cross-references.



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# File 'lib/softcover/builders/html.rb', line 175

def build_target_cache(xml)
  {}.tap do |target_cache|
    xml.xpath("//*[@id]").each do |target|
      target_cache[target['id']] = target
    end
  end
end

#clean! ⇒ Object 



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# File 'lib/softcover/builders/html.rb', line 227

def clean!
  # It's safe to remove HTML files in the html/ directory,
  # as they are regenerated every time the book gets built.
  # This also arranges to clear out unused HTML files, as happens when,
  # e.g., the name of a LaTeX chapter file changes.
  FileUtils.rm(Dir.glob(path('html/*.html')))
end

#converted_html(basename) ⇒ Object

Returns the converted HTML.



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# File 'lib/softcover/builders/html.rb', line 108

def converted_html(basename)
  polytex_filename = basename + '.tex'
  polytex = File.read(polytex_filename)
  # Replace the includes with the file contents, padding with a trailing
  # newline for safety.
  polytex.gsub!(/(^\s*\\include{(.*?)})/) do
    File.read($2 + '.tex') + "\n"
  end
  Polytexnic::Pipeline.new(polytex,
                           custom_commands: Softcover.custom_styles,
                           language_labels: language_labels).to_html
end

#polytex(chapter, markdown) ⇒ Object

Returns the PolyTeX for the chapter. As a side-effect, we cache a digest of the Markdown to prevent unnecessary conversions.



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# File 'lib/softcover/builders/html.rb', line 98

def polytex(chapter, markdown)
  File.write(chapter.cache_filename, digest(markdown))
  p = Polytexnic::Pipeline.new(markdown,
                               source: :markdown,
                               custom_commands: Softcover.custom_styles,
                               language_labels: language_labels)
  p.polytex
end

#remove_unneeded_polytex_files ⇒ Object

Removes any PolyTeX files not corresponding to current MD chapters.



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# File 'lib/softcover/builders/html.rb', line 65

def remove_unneeded_polytex_files
  files_to_keep = manifest.chapters.map do |chapter|
                    path("#{manifest.polytex_dir}/#{chapter.slug}.tex")
                  end
  all_files = Dir.glob(path("#{manifest.polytex_dir}/*.tex"))
  files_to_remove = all_files - files_to_keep
  FileUtils.rm(files_to_remove)
end

#setup ⇒ Object 



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# File 'lib/softcover/builders/html.rb', line 8

def setup
  Dir.mkdir "html" unless File.directory?("html")
  html_styles = path('html/stylesheets')
  unless File.directory?(html_styles)
    Dir.mkdir html_styles
  end
  template_dir = path("#{File.dirname(__FILE__)}/../template")
  custom_css = path("#{template_dir}/html/stylesheets/custom.css")
  target = path("#{html_styles}/custom.css")
  FileUtils.cp(custom_css, target) unless File.exist?(target)
  clean!
end

#split_into_chapters(xml) ⇒ Object

Splits the full XML document into chapters.



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# File 'lib/softcover/builders/html.rb', line 151

def split_into_chapters(xml)
  chapter_number = 0
  current_chapter = manifest.chapters.first
  reference_cache = {}
  xml.css('#book>div').each do |node|
    klass = node.attributes['class'].to_s
    id = node.attributes['id'].to_s
    if klass == 'chapter' || id == 'frontmatter'
      current_chapter = manifest.chapters[chapter_number]
      node['data-chapter'] = current_chapter.slug
      chapter_number += 1
    end

    reference_cache[node['data-tralics-id']] = current_chapter
    node.xpath('.//*[@data-tralics-id]').each do |labeled_node|
      reference_cache[labeled_node['data-tralics-id']] = current_chapter
    end

    current_chapter.nodes.push node
  end
  reference_cache
end

#update_cross_references(chapter, ref_map, target_cache) ⇒ Object

Updates the book’s cross-references.



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# File 'lib/softcover/builders/html.rb', line 184

def update_cross_references(chapter, ref_map, target_cache)
  chapter.nodes.each do |node|
    node.css('a.hyperref').each do |ref_node|
      ref_id = ref_node['href'][1..-1]  # i.e., 'cha-foo_bar'
      target = target_cache[ref_id]
      unless target.nil?
        id = target['id']
        ref_chapter = if target['data-tralics-id'].nil?
                        # This branch is true for chapter-star.
                        chapter
                      else
                        ref_map[target['data-tralics-id']]
                      end
        ref_node['href'] = "#{ref_chapter.fragment_name}##{id}"
      end
    end
  end
end

#write_chapter_html_files(html, erb_file) ⇒ Object

Writes the full HTML file for each chapter. The resulting files are self-contained HTML documents suitable for viewing in isolation.



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# File 'lib/softcover/builders/html.rb', line 140

def write_chapter_html_files(html, erb_file)
  reference_cache = split_into_chapters(html)
  target_cache = build_target_cache(html)
  manifest.chapters.each_with_index do |chapter, i|
    update_cross_references(chapter, reference_cache, target_cache)
    write_fragment_file(chapter)
    write_complete_file(chapter, erb_file, i)
  end
end

#write_complete_file(chapter, erb_file, n) ⇒ Object

Writes the chapter as a complete, self-contained HTML document.



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# File 'lib/softcover/builders/html.rb', line 215

def write_complete_file(chapter, erb_file, n)
  html_filename = File.join('html', chapter.slug + '.html')
  File.open(html_filename, 'w') do |f|
    @html = chapter.nodes.map(&:to_xhtml).join("\n")
    @mathjax = Softcover::Mathjax::config(chapter_number: n)
    @src     = Softcover::Mathjax::AMS_SVG
    file_content = ERB.new(erb_file).result(binding)
    f.write(file_content)
  end
  built_files.push html_filename
end

#write_fragment_file(chapter) ⇒ Object

Writes the chapter fragment HTML (omitting, e.g., <html> tags, etc.)



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# File 'lib/softcover/builders/html.rb', line 204

def write_fragment_file(chapter)
  html_filename = File.join('html', "#{chapter.slug}_fragment.html")
  File.open(html_filename, 'w') do |f|
    chapter.nodes.each do |node|
      f.write(node.to_xhtml)
    end
  end
  built_files.push html_filename
end

#write_full_html_file(basename, file_content) ⇒ Object

Writes the full HTML file for the book. The resulting file is a self-contained HTML document suitable for viewing in isolation.



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# File 'lib/softcover/builders/html.rb', line 124

def write_full_html_file(basename, file_content)
  html_filename = File.join('html', basename + '.html')
  File.open(html_filename, 'w') do |f|
    f.write(file_content)
  end
  polytexnic_css = File.join('html', 'stylesheets', 'softcover.css')
  source_css     = File.join(File.dirname(__FILE__),
                             "../template/#{polytexnic_css}")
  FileUtils.cp source_css, polytexnic_css
  write_pygments_file(:html, File.join('html', 'stylesheets'))
  built_files.push html_filename
end

#write_latex_files(chapter, options = {}) ⇒ Object

Writes the LaTeX files for a given Markdown chapter.



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# File 'lib/softcover/builders/html.rb', line 75

def write_latex_files(chapter, options = {})
  polytex_filename = path("#{manifest.polytex_dir}/#{chapter.slug}.tex")
  if chapter.source == :polytex
    FileUtils.cp path("chapters/#{chapter.full_name}"), polytex_filename
  else
    mkdir Softcover::Directories::TMP
    markdown = File.read(path("chapters/#{chapter.full_name}"))
    # Only write if the Markdown file hasn't changed since the last time
    # it was converted, as then the current PolyTeX file is up-to-date.
    # The call to File.exist?(filename) is just in case the PolyTeX file
    # corresponding to the Markdown file was removed by hand in the
    # interim.
    unless (File.exist?(chapter.cache_filename) &&
            File.read(chapter.cache_filename) == digest(markdown) &&
            File.exist?(polytex_filename))
      File.write(polytex_filename, polytex(chapter, markdown))
    end
  end
end