Remove trailing whitespace

Author: chloerei

Rakefile

@@ -10,19 +10,19 @@ namespace :book do
   desc 'build basic book formats'
   task :build => :prebuild do
     puts "Converting to HTML..."
-    `bundle exec asciidoctor progit.asc`
+    `bundle exec asciidoctor -r ./config.rb progit.asc`
     puts " -- HTML output at progit.html"
 
     puts "Converting to EPub..."
-    `bundle exec asciidoctor-epub3 progit.asc`
+    `bundle exec asciidoctor-epub3 -r ./config.rb progit.asc`
     puts " -- Epub output at progit.epub"
 
     puts "Converting to Mobi (kf8)..."
-    `bundle exec asciidoctor-epub3 -a ebook-format=kf8 progit.asc`
+    `bundle exec asciidoctor-epub3 -r ./config.rb -a ebook-format=kf8 progit.asc`
     puts " -- Mobi output at progit.mobi"
 
     puts "Converting to PDF... (this one takes a while)"
-    `bundle exec asciidoctor-pdf -r asciidoctor-pdf-cjk-kai_gen_gothic -a pdf-style=KaiGenGothicCN progit.asc 2>/dev/null`
+    `bundle exec asciidoctor-pdf -r ./config.rb -a pdf-style=KaiGenGothicCN progit.asc 2>/dev/null`
     puts " -- PDF  output at progit.pdf"
   end
 end

config.rb

@@ -0,0 +1,23 @@
+Bundler.require(:default)
+
+class TrailingTreeprocessor < Asciidoctor::Extensions::Treeprocessor
+  def process document
+    return unless document.blocks?
+    process_blocks document
+    nil
+  end
+
+  def process_blocks node
+    node.blocks.each_with_index do |block, index|
+      if block.context == :paragraph
+        node.blocks[index] = create_paragraph block.document, block.content.gsub("\n", ''), block.attributes
+      else
+        process_blocks block
+      end
+    end
+  end
+end
+
+Asciidoctor::Extensions.register do
+  treeprocessor TrailingTreeprocessor
+end