# ---------------------------------------------------------------------------
#
# This script generates the guides. It can be invoked either directly or via the
# generate_guides rake task within the railties directory.
#
# Guides are taken from the source directory, and the resulting HTML goes into the
# output directory. Assets are stored under files, and copied to output/files as
# part of the generation process.
#
# Some arguments may be passed via environment variables:
#
# WARNINGS
# If you are writing a guide, please work always with WARNINGS=1. Users can
# generate the guides, and thus this flag is off by default.
#
# Internal links (anchors) are checked. If a reference is broken levenshtein
# distance is used to suggest an existing one. This is useful since IDs are
# generated by Textile from headers and thus edits alter them.
#
# Also detects duplicated IDs. They happen if there are headers with the same
# text. Please do resolve them, if any, so guides are valid XHTML.
#
# ALL
# Set to "1" to force the generation of all guides.
#
# ONLY
# Use ONLY if you want to generate only one or a set of guides. Prefixes are
# enough:
#
# # generates only association_basics.html
# ONLY=assoc ruby rails_guides.rb
#
# Separate many using commas:
#
# # generates only
# ONLY=assoc,migrations ruby rails_guides.rb
#
# Note that if you are working on a guide generation will by default process
# only that one, so ONLY is rarely used nowadays.
#
# EDGE
# Set to "1" to indicate generated guides should be marked as edge. This
# inserts a badge and changes the preamble of the home page.
#
# ---------------------------------------------------------------------------
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, :edge
GUIDES_RE = /\.(?:textile|html\.erb)$/
def initialize(output=nil)
initialize_dirs(output)
create_output_dir_if_needed
set_edge
end
def generate
generate_guides
copy_assets
end
private
def initialize_dirs(output)
@guides_dir = File.join(File.dirname(__FILE__), '..')
@source_dir = File.join(@guides_dir, "source")
@output_dir = output || File.join(@guides_dir, "output")
end
def create_output_dir_if_needed
FileUtils.mkdir_p(output_dir)
end
def set_edge
@edge = ENV['EDGE'] == '1'
end
def generate_guides
guides_to_generate.each do |guide|
output_file = output_file_for(guide)
generate_guide(guide, output_file) if generate?(guide, output_file)
end
end
def guides_to_generate
guides = Dir.entries(source_dir).grep(GUIDES_RE)
ENV.key?('ONLY') ? select_only(guides) : guides
end
def select_only(guides)
prefixes = ENV['ONLY'].split(",").map(&:strip)
guides.select do |guide|
prefixes.any? {|p| guide.start_with?(p)}
end
end
def copy_assets
FileUtils.cp_r(Dir.glob("#{guides_dir}/assets/*"), output_dir)
end
def output_file_for(guide)
guide.sub(GUIDES_RE, '.html')
end
def generate?(source_file, output_file)
fin = File.join(source_dir, source_file)
fout = File.join(output_dir, output_file)
ENV['ALL'] == '1' || !File.exists?(fout) || File.mtime(fout) < File.mtime(fin)
end
def generate_guide(guide, output_file)
puts "Generating #{output_file}"
File.open(File.join(output_dir, output_file), 'w') do |f|
view = ActionView::Base.new(source_dir, :edge => edge)
view.extend(Helpers)
if guide =~ /\.html\.erb$/
# Generate the special pages like the home.
result = view.render(:layout => 'layout', :file => guide)
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['WARNINGS'] == '1'
end
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 = children.empty? ? "" : 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 ID: #{anchor}, please put and explicit ID, e.g. h4(#explicit-id), or consider rewording"
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
end
end