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require 'set'
require 'fileutils'
require 'active_support/core_ext/string/output_safety'
require 'action_controller'
require 'action_view'
require 'rails_guides/indexer'
require 'rails_guides/helpers'
require 'rails_guides/levenshtein'
module RailsGuides
class Generator
attr_reader :guides_dir, :source_dir, :output_dir
def initialize(output=nil)
initialize_dirs(output)
create_output_dir_if_needed
end
def generate
generate_guides
copy_assets
end
private
def initialize_dirs(output)
@guides_dir = File.join(File.dirname(__FILE__), '..')
@source_dir = File.join(@guides_dir, "source")
@output_dir = output || File.join(@guides_dir, "output")
end
def create_output_dir_if_needed
FileUtils.mkdir_p(output_dir)
end
def generate_guides
guides_to_generate.each do |guide|
output_file = output_file_for(guide)
generate_guide(guide, output_file) if generate?(guide, output_file)
end
end
def guides_to_generate
guides = Dir.entries(source_dir).grep(/\.textile(?:\.erb)?$/)
ENV.key?("ONLY") ? select_only(guides) : guides
end
def select_only(guides)
prefixes = ENV["ONLY"].split(",").map(&:strip)
guides.select do |guide|
prefixes.any? {|p| guide.start_with?(p)}
end
end
def copy_assets
FileUtils.cp_r(File.join(guides_dir, 'images'), File.join(output_dir, 'images'))
FileUtils.cp_r(File.join(guides_dir, 'files'), File.join(output_dir, 'files'))
end
def output_file_for(guide)
guide.sub(/\.textile(?:\.erb)?$/, '.html')
end
def generate?(source_file, output_file)
fin = File.join(source_dir, source_file)
fout = File.join(output_dir, output_file)
ENV['ALL'] == '1' || !File.exists?(fout) || File.mtime(fout) < File.mtime(fin)
end
def generate_guide(guide, output_file)
puts "Generating #{output_file}"
File.open(File.join(output_dir, output_file), 'w') do |f|
view = ActionView::Base.new(source_dir)
view.extend(Helpers)
if guide =~ /\.textile\.erb$/
# Generate the erb pages with textile formatting - e.g. index/authors
result = view.render(:layout => 'layout', :file => guide)
result = textile(result)
else
body = File.read(File.join(source_dir, guide))
body = set_header_section(body, view)
body = set_index(body, view)
result = view.render(:layout => 'layout', :text => textile(body))
warn_about_broken_links(result) if ENV.key?("WARN_BROKEN_LINKS")
end
# FIXME: If the doctype is in the layout textile escapes it.
# Things should be set up in a way that prevents that, a doctype
# belongs to the layout.
result = insert_doctype(result)
result = insert_edge_badge(result) if ENV.key?('INSERT_EDGE_BADGE')
f.write result
end
end
def set_header_section(body, view)
new_body = body.gsub(/(.*?)endprologue\./m, '').strip
header = $1
header =~ /h2\.(.*)/
page_title = $1.strip
header = textile(header)
view.content_for(:page_title) { page_title.html_safe }
view.content_for(:header_section) { header.html_safe }
new_body
end
def set_index(body, view)
index = <<-INDEX
<div id="subCol">
<h3 class="chapter"><img src="images/chapters_icon.gif" alt="" />Chapters</h3>
<ol class="chapters">
INDEX
i = Indexer.new(body)
i.index
# Set index for 2 levels
i.level_hash.each do |key, value|
link = view.content_tag(:a, :href => key[:id]) { textile(key[:title]).html_safe }
children = value.keys.map do |k|
l = view.content_tag(:a, :href => k[:id]) { textile(k[:title]).html_safe }
view.content_tag(:li, l.html_safe)
end
children_ul = view.content_tag(:ul, children.join(" ").html_safe)
index << view.content_tag(:li, link.html_safe + children_ul.html_safe)
end
index << '</ol>'
index << '</div>'
view.content_for(:index_section) { index.html_safe }
i.result
end
def textile(body)
# If the issue with notextile is fixed just remove the wrapper.
with_workaround_for_notextile(body) do |body|
t = RedCloth.new(body)
t.hard_breaks = false
t.to_html(:notestuff, :plusplus, :code, :tip)
end
end
# For some reason the notextile tag does not always turn off textile. See
# LH ticket of the security guide (#7). As a temporary workaround we deal
# with code blocks by hand.
def with_workaround_for_notextile(body)
code_blocks = []
body.gsub!(%r{<(yaml|shell|ruby|erb|html|sql|plain)>(.*?)</\1>}m) do |m|
es = ERB::Util.h($2)
css_class = ['erb', 'shell'].include?($1) ? 'html' : $1
code_blocks << %{<div class="code_container"><code class="#{css_class}">#{es}</code></div>}
"\ndirty_workaround_for_notextile_#{code_blocks.size - 1}\n"
end
body = yield body
body.gsub(%r{<p>dirty_workaround_for_notextile_(\d+)</p>}) do |_|
code_blocks[$1.to_i]
end
end
def warn_about_broken_links(html)
anchors = extract_anchors(html)
check_fragment_identifiers(html, anchors)
end
def extract_anchors(html)
# Textile generates headers with IDs computed from titles.
anchors = Set.new
html.scan(/<h\d\s+id="([^"]+)/).flatten.each do |anchor|
if anchors.member?(anchor)
puts "*** DUPLICATE HEADER ID: #{anchor}, please consider rewording" if ENV.key?("WARN_DUPLICATE_HEADERS")
else
anchors << anchor
end
end
# Also, footnotes are rendered as paragraphs this way.
anchors += Set.new(html.scan(/<p\s+class="footnote"\s+id="([^"]+)/).flatten)
return anchors
end
def check_fragment_identifiers(html, anchors)
html.scan(/<a\s+href="#([^"]+)/).flatten.each do |fragment_identifier|
next if fragment_identifier == 'mainCol' # in layout, jumps to some DIV
unless anchors.member?(fragment_identifier)
guess = anchors.min { |a, b|
Levenshtein.distance(fragment_identifier, a) <=> Levenshtein.distance(fragment_identifier, b)
}
puts "*** BROKEN LINK: ##{fragment_identifier}, perhaps you meant ##{guess}."
end
end
end
def insert_doctype(html)
<<EOS + html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
EOS
end
def insert_edge_badge(html)
html.sub(/<body[^>]*>/, '\&<img src="images/edge_badge.png" style="position:fixed; right:0px; top:0px; border:none; z-index:100"/>')
end
end
end
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