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require "set"
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/markdown"
require "rails_guides/indexer"
require "rails_guides/helpers"
require "rails_guides/levenshtein"
module RailsGuides
class Generator
GUIDES_RE = /\.(?:erb|md)\z/
def initialize(edge:, version:, all:, only:, kindle:, language:)
@edge = edge
@version = version
@all = all
@only = only
@kindle = kindle
@language = language
if @kindle
check_for_kindlegen
register_kindle_mime_types
end
initialize_dirs
create_output_dir_if_needed
initialize_markdown_renderer
end
def generate
generate_guides
copy_assets
generate_mobi if @kindle
end
private
def register_kindle_mime_types
Mime::Type.register_alias("application/xml", :opf, %w(opf))
Mime::Type.register_alias("application/xml", :ncx, %w(ncx))
end
def check_for_kindlegen
if `which kindlegen`.blank?
raise "Can't create a kindle version without `kindlegen`."
end
end
def generate_mobi
require "rails_guides/kindle"
out = "#{@output_dir}/kindlegen.out"
Kindle.generate(@output_dir, mobi, out)
puts "(kindlegen log at #{out})."
end
def mobi
mobi = "ruby_on_rails_guides_#{@version || @edge[0, 7]}"
mobi += ".#{@language}" if @language
mobi += ".mobi"
end
def initialize_dirs
@guides_dir = File.expand_path("..", __dir__)
@source_dir = "#{@guides_dir}/source"
@source_dir += "/#{@language}" if @language
@output_dir = "#{@guides_dir}/output"
@output_dir += "/kindle" if @kindle
@output_dir += "/#{@language}" if @language
end
def create_output_dir_if_needed
FileUtils.mkdir_p(@output_dir)
end
def initialize_markdown_renderer
Markdown::Renderer.edge = @edge
Markdown::Renderer.version = @version
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)
if @kindle
Dir.entries("#{@source_dir}/kindle").grep(GUIDES_RE).map do |entry|
next if entry == "KINDLE.md"
guides << "kindle/#{entry}"
end
end
@only ? select_only(guides) : guides
end
def select_only(guides)
prefixes = @only.split(",").map(&:strip)
guides.select do |guide|
guide.start_with?("kindle", *prefixes)
end
end
def copy_assets
FileUtils.cp_r(Dir.glob("#{@guides_dir}/assets/*"), @output_dir)
end
def output_file_for(guide)
if guide.end_with?(".md")
guide.sub(/md\z/, "html")
else
guide.sub(/\.erb\z/, "")
end
end
def output_path_for(output_file)
File.join(@output_dir, File.basename(output_file))
end
def generate?(source_file, output_file)
fin = File.join(@source_dir, source_file)
fout = output_path_for(output_file)
@all || !File.exist?(fout) || File.mtime(fout) < File.mtime(fin)
end
def generate_guide(guide, output_file)
output_path = output_path_for(output_file)
puts "Generating #{guide} as #{output_file}"
layout = @kindle ? "kindle/layout" : "layout"
File.open(output_path, "w") do |f|
view = ActionView::Base.new(
@source_dir,
edge: @edge,
version: @version,
mobi: "kindle/#{mobi}",
language: @language
)
view.extend(Helpers)
if guide =~ /\.(\w+)\.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, formats: [$1], file: $`)
else
body = File.read("#{@source_dir}/#{guide}")
result = RailsGuides::Markdown.new(
view: view,
layout: layout,
edge: @edge,
version: @version
).render(body)
warn_about_broken_links(result)
end
f.write(result)
end
end
def warn_about_broken_links(html)
anchors = extract_anchors(html)
check_fragment_identifiers(html, anchors)
end
def extract_anchors(html)
# Markdown 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 make sure that there're no headings with the same name at the same level."
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)
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
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