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!, #article?, #as_size, #book_file_lines, #chapter_label, #commands, #current_book, #dependency_filename, #digest, #executable, #execute, #filename_or_default, #first_path, #get_filename, #html_extension, #in_book_directory?, #language_labels, #linux?, #logged_in?, #master_content, #master_filename, #master_latex_header, #mkdir, #non_comment_lines, #os_x?, #path, #polytexnic_html, #raw_lines, #reset_current_book!, #rm, #rm_r, #silence, #silence_stream, #source, #template_dir, #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 



21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
 
# File 'lib/softcover/builders/html.rb', line 21

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

  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
    @mathjax = Softcover::Mathjax::config(chapter_number: false)
    @src     = Softcover::Mathjax::AMS_SVG
    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(manifest.slug, file_content, options)
    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
  write_master_latex_file(manifest)
  true
end

#build_target_cache(xml) ⇒ Object

Builds a cache of targets for cross-references.



196
197
198
199
200
201
202
 
# File 'lib/softcover/builders/html.rb', line 196

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 



255
256
257
258
259
260
261
262
 
# File 'lib/softcover/builders/html.rb', line 255

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')))
  FileUtils.rm(Dir.glob(path('html/*.xhtml')))
end

#converted_html(basename) ⇒ Object

Returns the converted HTML.



110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
 
# File 'lib/softcover/builders/html.rb', line 110

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
  # Insert a newline, needed to avoid formatting weirdness in articles.
  polytex.gsub!(/\\maketitle/, "\\maketitle\n") if article?
  Polytexnic::Pipeline.new(polytex,
                           custom_commands: Softcover.custom_styles,
                           language_labels: language_labels,
                           article: Softcover::Utils.article?).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.



99
100
101
102
103
104
105
106
107
 
# File 'lib/softcover/builders/html.rb', line 99

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,
                               article: Softcover::Utils.article?)
  p.polytex
end

#remove_unneeded_polytex_files ⇒ Object

Removes any PolyTeX files not corresponding to current MD chapters.



65
66
67
68
69
70
71
72
 
# 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(options) ⇒ Object 



8
9
10
11
12
13
14
15
16
17
18
19
 
# File 'lib/softcover/builders/html.rb', line 8

def setup(options)
  Dir.mkdir "html" unless File.directory?("html")
  html_styles = path('html/stylesheets')
  unless File.directory?(html_styles)
    Dir.mkdir html_styles
  end
  template_dir = Softcover::Utils.template_dir(options)
  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.



158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
 
# File 'lib/softcover/builders/html.rb', line 158

def split_into_chapters(xml)
  chapter_number = 0
  current_chapter = manifest.chapters.first
  reference_cache = {}
  if Softcover::Utils.article?
    # Include all the material before the first section.
    xml.css('#book').children.each do |node|
      next  if node['id'] == 'title_page'
      break if node['class'] == 'section'
      current_chapter.nodes.push node
      node.remove
    end
  end
  xml.css('#book>div').each do |node|
    # Include the title page info.
    if node['id'] == 'title_page'
      current_chapter.nodes.unshift node
    else
      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
  end
  reference_cache
end

#update_cross_references(chapter, ref_map, target_cache) ⇒ Object

Updates the book’s cross-references.



205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
 
# File 'lib/softcover/builders/html.rb', line 205

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.



145
146
147
148
149
150
151
152
153
154
155
 
# File 'lib/softcover/builders/html.rb', line 145

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
rescue NoMethodError
  $stderr.puts "Build failed. Check that no chapter contains more than one top-level section (#)"
end

#write_complete_file(chapter, erb_file, n) ⇒ Object

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



237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
 
# File 'lib/softcover/builders/html.rb', line 237

def write_complete_file(chapter, erb_file, n)
  html_filename = File.join('html', "#{chapter.slug}.#{html_extension}")
  # Make references absolute.
  chapter.nodes.each do |node|
    node.css('a.hyperref').each do |ref_node|
      ref_node['href'] = ref_node['href'].sub('_fragment', '')
    end
  end
  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.)



225
226
227
228
229
230
231
232
233
234
 
# File 'lib/softcover/builders/html.rb', line 225

def write_fragment_file(chapter)
  html_filename = File.join('html',
                            "#{chapter.slug}_fragment.#{html_extension}")
  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, options) ⇒ Object

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



129
130
131
132
133
134
135
136
137
138
139
140
 
# File 'lib/softcover/builders/html.rb', line 129

def write_full_html_file(basename, file_content, options)
  html_filename = File.join('html', "#{basename}.#{html_extension}")
  File.open(html_filename, 'w') do |f|
    f.write(file_content)
  end
  polytexnic_css = File.join('html', 'stylesheets', 'softcover.css')
  source_css     = File.join(Softcover::Utils.template_dir(options),
                             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.



75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
 
# 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) &&
            !markdown.include?('\input'))
      File.write(polytex_filename, polytex(chapter, markdown))
    end
  end
end