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# encoding: UTF-8

require 'rake/clean'


$lang = ENV['language']
$lang ||= 'en'

namespace :epub do
TMP_DIR = File.join('epub', 'temp', $lang)
INDEX_FILEPATH = File.join(TMP_DIR, 'sdcamp.html')
TARGET_FILEPATH = "sdcamp-#{$lang}.epub"

SOURCE_FILES = FileList.new(File.join($lang, '**', '*.markdown')).sort
CONVERTED_MK_FILES = SOURCE_FILES.pathmap(File.join(TMP_DIR, '%f'))
HTML_FILES = CONVERTED_MK_FILES.ext('html')

desc "generate EPUB ebook (add language=xx to build lang xx)"
task :generate => :check
task :generate => TARGET_FILEPATH

desc "check whether all the required tools are installed"
task :check do
begin
require 'maruku'
found_maruku = true
rescue LoadError
found_maruku = false
end

$ebook_convert_cmd = ENV['ebook_convert_path'].to_s
if $ebook_convert_cmd.empty?
$ebook_convert_cmd = `which ebook-convert`.chomp
end
if $ebook_convert_cmd.empty?
mac_osx_path = '/Applications/calibre.app/Contents/MacOS/ebook-convert'
$ebook_convert_cmd = mac_osx_path
end
found_calibre = File.executable?($ebook_convert_cmd)

if !found_maruku
puts 'EPUB generation requires the Maruku gem.'
puts ' On Ubuntu call "sudo apt-get install libmaruku-ruby".'
end
if !found_calibre
puts 'EPUB generation requires Calibre.'
puts ' On Ubuntu call "sudo apt-get install calibre".'
end

if !found_calibre || !found_maruku then exit 1 end
end

directory TMP_DIR

rule '.html' => '.mk' do |t|
require 'maruku'

mk_filename = t.source
html_filename = t.name
puts "Converting #{mk_filename} -> #{html_filename}"

mk_file = File.open(mk_filename, 'r') do |mk|
html_file = File.open(html_filename, 'w') do |html|
code = Maruku.new(mk.read.encode("UTF-8")).to_html
code.gsub!(/^(<h.) (id='[^']+?')/, '\1')
html << code
html << "\n"
end
end
end

src_for_converted = proc do |dst|
base_name = dst.pathmap('%n')
SOURCE_FILES.find { |s| s.pathmap('%n') == base_name }
end

rule '.mk' => src_for_converted do |t|
src_filename = t.source
dest_filename = t.name
puts "Processing #{src_filename} -> #{dest_filename}"

figures_dir = "../../../figures"

dest_file = File.open(dest_filename, 'w')
src_file = File.open(src_filename, 'r')
until src_file.eof?
line = src_file.readline

matches = line.match /^\s*Insert\s(.*)/
if matches
image_path = matches[1]
real_image_path = image_path.pathmap("#{figures_dir}/%X-tn%x")

next_line = src_file.readline.chomp

line = "![#{next_line}](#{real_image_path} \"#{next_line}\")\n"
end

dest_file << line
end
src_file.close
dest_file.close
end

file INDEX_FILEPATH => TMP_DIR
file INDEX_FILEPATH => HTML_FILES do
index_file = File.open(INDEX_FILEPATH, 'w') do |file|
file << '<?xml version="1.0" encoding="UTF-8"?>'
file << "\n"
file << '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" '
file << '"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'
file << "\n"
file << "<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='#{$lang}'>"
file << '<head>'
file << '<title>Pro Git - professional version control</title>'
file << '</head>'
file << '<body>'
file << "\n"

HTML_FILES.each do |chapter_file|
file << File.open(chapter_file).read
file << "\n"
end

file << '</body></html>'
file << "\n"
end
end

file TARGET_FILEPATH => INDEX_FILEPATH do
opts = [
'--language', $lang,
'--authors', 'Scott Chacon',
'--comments', 'Licensed under the Creative Commons Attribution-Non Commercial-Share Alike 3.0 license',

'--cover', 'epub/title.png',
'--extra-css', 'epub/ProGit.css',

'--chapter', '//h:h1',
'--level1-toc', '//h:h1',
'--level2-toc', '//h:h2',
'--level3-toc', '//h:h3',
]

sh $ebook_convert_cmd, INDEX_FILEPATH, TARGET_FILEPATH, *opts
end

CLEAN.push(*CONVERTED_MK_FILES)
CLEAN.push(*HTML_FILES)
CLEAN << INDEX_FILEPATH
CLEAN << TMP_DIR
CLOBBER << TARGET_FILEPATH
end

namespace :pdf do
        desc "generate a pdf"
        task :generate do
                system("ruby makepdfs")
        end
end
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