update build script for better management of PDF

Author: jnavila

Diff for: Gemfile

@@ -8,6 +8,8 @@ gem 'awesome_print'
 
 gem 'asciidoctor-epub3', :git => 'https://github.com/asciidoctor/asciidoctor-epub3'
 gem 'asciidoctor-pdf', '1.5.0.alpha.16'
+gem 'asciidoctor-pdf-cjk', '~> 0.1.3'
+gem 'asciidoctor-pdf-cjk-kai_gen_gothic', '~> 0.1.1'
 
 gem 'coderay'
 gem 'pygments.rb'

Diff for: Rakefile

@@ -1,29 +1,38 @@
 # coding: utf-8
 require 'octokit'
 
+def exec_or_raise(command)
+  puts `#{command}`
+  if (! $?.success?)
+    raise "'#{command}' failed"
+  end
+end
+
 namespace :book do
   desc 'build basic book formats'
   task :build do
 
     puts "Generating contributors list"
-    `git shortlog -s --all| grep -v -E "(Straub|Chacon)" | cut -f 2- | column -c 120 > book/contributors.txt`
+    exec_or_raise("git shortlog -s --all| grep -v -E '(Straub|Chacon)' | cut -f 2- | column -c 120 > book/contributors.txt")
 
     puts "Converting to HTML..."
-    `bundle exec asciidoctor progit.asc`
+    exec_or_raise("bundle exec asciidoctor progit.asc")
     puts " -- HTML output at progit.html"
 
     puts "Converting to EPub..."
-    `bundle exec asciidoctor-epub3 progit.asc`
+    exec_or_raise("bundle exec asciidoctor-epub3 progit.asc")
     puts " -- Epub output at progit.epub"
 
-    sh "epubcheck progit.epub"
+    exec_or_raise("epubcheck progit.epub")
 
     puts "Converting to Mobi (kf8)..."
-    `bundle exec asciidoctor-epub3 -a ebook-format=kf8 progit.asc`
+    exec_or_raise("bundle exec asciidoctor-epub3 -a ebook-format=kf8 progit.asc")
     puts " -- Mobi output at progit.mobi"
 
+    repo = ENV['TRAVIS_REPO_SLUG']
     puts "Converting to PDF... (this one takes a while)"
-    `bundle exec asciidoctor-pdf progit.asc 2>/dev/null`
+    exec_or_raise("asciidoctor-pdf-cjk-kai_gen_gothic-install")
+    exec_or_raise("bundle exec asciidoctor-pdf -r asciidoctor-pdf-cjk -r asciidoctor-pdf-cjk-kai_gen_gothic -a pdf-style=KaiGenGothicJP progit.asc")
     puts " -- PDF output at progit.pdf"
   end
 
@@ -148,7 +157,7 @@ namespace :book do
         content = File.read (filename)
         new_contents = content.gsub(/include::(.*?)asc/) {|match|
           "include::book/#{num}-#{title}/#{$1}asc"}
-        `git rm #{filename}`
+        `git rm -f #{filename}`
         File.open("#{chap}.asc", "w") {|file|
           file.puts "[##{chap}]\n"
           file.puts new_contents }