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rails--rails/railties/guides/rails_guides/generator.rb

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# ---------------------------------------------------------------------------
#
# 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:
#
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# # generates only association_basics.html and migrations.html
# 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.
#
# GUIDES_LANGUAGE
# Use GUIDES_LANGUAGE when you want to generate translated guides in
# <tt>source/<GUIDES_LANGUAGE></tt> folder (such as <tt>source/es</tt>).
# Ignore it when generating English guides.
#
# 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'
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require 'fileutils'
require 'active_support/core_ext/string/output_safety'
require 'active_support/core_ext/object/blank'
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, :warnings, :all
GUIDES_RE = /\.(?:textile|html\.erb)$/
def initialize(output=nil)
@lang = ENV['GUIDES_LANGUAGE']
initialize_dirs(output)
create_output_dir_if_needed
set_flags_from_environment
end
def generate
generate_guides
copy_assets
end
private
def initialize_dirs(output)
@guides_dir = File.join(File.dirname(__FILE__), '..')
@source_dir = File.join(@guides_dir, "source", @lang.to_s)
@output_dir = output || File.join(@guides_dir, "output", @lang.to_s)
end
def create_output_dir_if_needed
FileUtils.mkdir_p(output_dir)
end
def set_flags_from_environment
@edge = ENV['EDGE'] == '1'
@warnings = ENV['WARNINGS'] == '1'
@all = ENV['ALL'] == '1'
end
def generate_guides
guides_to_generate.each do |guide|
output_file = output_file_for(guide)
generate_guide(guide, output_file) if generate?(guide, output_file)
end
end
def guides_to_generate
guides = Dir.entries(source_dir).grep(GUIDES_RE)
ENV.key?('ONLY') ? select_only(guides) : guides
end
def select_only(guides)
prefixes = ENV['ONLY'].split(",").map(&:strip)
guides.select do |guide|
prefixes.any? {|p| guide.start_with?(p)}
end
end
def copy_assets
FileUtils.cp_r(Dir.glob("#{guides_dir}/assets/*"), output_dir)
end
def output_file_for(guide)
guide.sub(GUIDES_RE, '.html')
end
def generate?(source_file, output_file)
fin = File.join(source_dir, source_file)
fout = File.join(output_dir, output_file)
all || !File.exists?(fout) || File.mtime(fout) < File.mtime(fin)
end
def generate_guide(guide, output_file)
puts "Generating #{output_file}"
File.open(File.join(output_dir, output_file), 'w') do |f|
view = ActionView::Base.new(source_dir, :edge => edge)
view.extend(Helpers)
if guide =~ /\.html\.erb$/
# Generate the special pages like the home.
# Passing a template handler in the template name is deprecated. So pass the file name without the extension.
result = view.render(:layout => 'layout', :file => $`)
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 @warnings
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 = "Ruby on Rails Guides: #{$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, warnings)
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], true).html_safe }
children = value.keys.map do |k|
view.content_tag(:li,
view.content_tag(:a, :href => k[:id]) { textile(k[:title], true).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, lite_mode=false)
t = RedCloth.new(body)
t.hard_breaks = false
t.lite_mode = lite_mode
t.to_html(:notestuff, :plusplus, :code)
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
# Footnotes.
anchors += Set.new(html.scan(/<p\s+class="footnote"\s+id="([^"]+)/).flatten)
anchors += Set.new(html.scan(/<sup\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