Gemfile

# gem install bundler
# bundle install
source 'https://rubygems.org'
gem 'asciidoctor', '~>1.5.1'
gem 'haml', '~>4.0.0'
gem 'tilt', '~>2.0.0'
gem 'slim', '~>2.0.0'
#gem 'thread_safe', '~> 0.1.3'
gem 'asciidoctor-pdf', '~>1.5.0.alpha.6'
#gem 'asciidoctor-pdf', :git => 'git@github.com:asciidoctor/asciidoctor-pdf.git'
gem 'coderay', '1.1.0'
##gem 'thread-safe', '0.2.0'

# guarding
gem 'guard'
gem 'guard-shell'
gem 'guard-livereload'