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#!/usr/bin/env ruby
unless `which kindlerb`
abort "Please gem install kindlerb"
end
require "nokogiri"
require "fileutils"
require "yaml"
require "date"
module Kindle
extend self
def generate(output_dir, mobi_outfile, logfile)
output_dir = File.absolute_path(output_dir)
Dir.chdir output_dir do
puts "=> Using output dir: #{output_dir}"
puts "=> Arranging html pages in document order"
toc = File.read("toc.ncx")
doc = Nokogiri::XML(toc).xpath("//ncx:content", "ncx" => "http://www.daisy.org/z3986/2005/ncx/")
html_pages = doc.select { |c| c[:src] }.map { |c| c[:src] }.uniq
generate_front_matter(html_pages)
generate_sections(html_pages)
generate_document_metadata(mobi_outfile)
puts "Creating MOBI document with kindlegen. This may take a while."
cmd = "kindlerb . > #{File.absolute_path logfile} 2>&1"
puts cmd
system(cmd)
puts "MOBI document generated at #{File.expand_path(mobi_outfile, output_dir)}"
end
end
def generate_front_matter(html_pages)
frontmatter = []
html_pages.delete_if { |x|
if x =~ /(toc|welcome|credits|copyright).html/
frontmatter << x unless x =~ /toc/
true
end
}
html = frontmatter.map { |x|
Nokogiri::HTML(File.open(x)).at("body").inner_html
}.join("\n")
fdoc = Nokogiri::HTML(html)
fdoc.search("h3").each do |h3|
h3.name = "h4"
end
fdoc.search("h2").each do |h2|
h2.name = "h3"
h2["id"] = h2.inner_text.gsub(/\s/, "-")
end
add_head_section fdoc, "Front Matter"
File.open("frontmatter.html","w") { |f| f.puts fdoc.to_html }
html_pages.unshift "frontmatter.html"
end
def generate_sections(html_pages)
FileUtils::rm_rf("sections/")
html_pages.each_with_index do |page, section_idx|
FileUtils::mkdir_p("sections/%03d" % section_idx)
doc = Nokogiri::HTML(File.open(page))
title = doc.at("title").inner_text.gsub("Ruby on Rails Guides: ", "")
title = page.capitalize.gsub(".html", "") if title.strip == ""
File.open("sections/%03d/_section.txt" % section_idx, "w") { |f| f.puts title }
doc.xpath("//h3[@id]").each_with_index do |h3,item_idx|
subsection = h3.inner_text
content = h3.xpath("./following-sibling::*").take_while { |x| x.name != "h3" }.map(&:to_html)
item = Nokogiri::HTML(h3.to_html + content.join("\n"))
item_path = "sections/%03d/%03d.html" % [section_idx, item_idx]
add_head_section(item, subsection)
item.search("img").each do |img|
img["src"] = "#{Dir.pwd}/#{img['src']}"
end
item.xpath("//li/p").each { |p| p.swap(p.children); p.remove }
File.open(item_path, "w") { |f| f.puts item.to_html }
end
end
end
def generate_document_metadata(mobi_outfile)
puts "=> Generating _document.yml"
x = Nokogiri::XML(File.open("rails_guides.opf")).remove_namespaces!
cover_jpg = "#{Dir.pwd}/images/rails_guides_kindle_cover.jpg"
cover_gif = cover_jpg.sub(/jpg$/, "gif")
puts `convert #{cover_jpg} #{cover_gif}`
document = {
"doc_uuid" => x.at("package")["unique-identifier"],
"title" => x.at("title").inner_text.gsub(/\(.*$/, " v2"),
"publisher" => x.at("publisher").inner_text,
"author" => x.at("creator").inner_text,
"subject" => x.at("subject").inner_text,
"date" => x.at("date").inner_text,
"cover" => cover_gif,
"masthead" => nil,
"mobi_outfile" => mobi_outfile
}
puts document.to_yaml
File.open("_document.yml", "w") { |f| f.puts document.to_yaml }
end
def add_head_section(doc, title)
head = Nokogiri::XML::Node.new "head", doc
title_node = Nokogiri::XML::Node.new "title", doc
title_node.content = title
title_node.parent = head
css = Nokogiri::XML::Node.new "link", doc
css["rel"] = "stylesheet"
css["type"] = "text/css"
css["href"] = "#{Dir.pwd}/stylesheets/kindle.css"
css.parent = head
doc.at("body").before head
end
end
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