Use bundle

Author: marocchino

Gemfile

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+source "https://rubygems.org"
+ruby '2.1.1' unless ENV['DEV']
+
+gem 'rake',   '~> 10.0'
+gem 'jekyll', '>= 1.0.2'
+gem 'kramdown'
+
+gem 'rack-jekyll'
+gem 'rack-rewrite'
+gem 'rack-protection'

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    blankslate (2.1.2.4)
+    classifier (1.3.4)
+      fast-stemmer (>= 1.0.0)
+    colorator (0.1)
+    commander (4.1.6)
+      highline (~> 1.6.11)
+    fast-stemmer (1.0.2)
+    ffi (1.9.3)
+    highline (1.6.21)
+    jekyll (1.5.0)
+      classifier (~> 1.3)
+      colorator (~> 0.1)
+      commander (~> 4.1.3)
+      liquid (~> 2.5.5)
+      listen (~> 1.3)
+      maruku (= 0.7.0)
+      pygments.rb (~> 0.5.0)
+      redcarpet (~> 2.3.0)
+      safe_yaml (~> 1.0)
+      toml (~> 0.1.0)
+    kramdown (1.3.3)
+    liquid (2.5.5)
+    listen (1.3.1)
+      rb-fsevent (>= 0.9.3)
+      rb-inotify (>= 0.9)
+      rb-kqueue (>= 0.2)
+    maruku (0.7.0)
+    parslet (1.5.0)
+      blankslate (~> 2.0)
+    posix-spawn (0.3.8)
+    pygments.rb (0.5.4)
+      posix-spawn (~> 0.3.6)
+      yajl-ruby (~> 1.1.0)
+    rack (1.5.2)
+    rack-jekyll (0.4.1)
+      jekyll (>= 0.12.0, < 2.0)
+      rack (~> 1.5.0)
+    rack-protection (1.5.2)
+      rack
+    rack-rewrite (1.5.0)
+    rake (10.2.1)
+    rb-fsevent (0.9.4)
+    rb-inotify (0.9.3)
+      ffi (>= 0.5.0)
+    rb-kqueue (0.2.2)
+      ffi (>= 0.5.0)
+    redcarpet (2.3.0)
+    safe_yaml (1.0.1)
+    toml (0.1.1)
+      parslet (~> 1.5.0)
+    yajl-ruby (1.1.0)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  jekyll (>= 1.0.2)
+  kramdown
+  rack-jekyll
+  rack-protection
+  rack-rewrite
+  rake (~> 10.0)

Rakefile

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+# encoding: utf-8
+
+require 'rubygems'
+
+begin
+  require 'bundler/setup'
+rescue LoadError => e
+  warn e.message
+  warn "Run `gem install bundler` to install Bundler"
+  exit -1
+end
+
+HOST = 'www.ruby-lang.org'
+LANGUAGES = %w[bg de en es fr id it ja ko pl pt ru tr vi zh_cn zh_tw]
+
+task :default => [:generate]
+
+desc "Generates the Jekyll site"
+task :generate do
+  require 'jekyll'
+  # workaround for LANG=C environment
+  module Jekyll::Convertible
+    Encoding.default_external = Encoding::UTF_8
+  end
+
+  options = Jekyll.configuration({'auto' => false, 'server' => false})
+  puts "Building site: #{options['source']} -> #{options['destination']}"
+  $stdout.flush
+  Jekyll::Site.new(options).process
+end
+
+desc "Generates the Jekyll site and starts local server"
+task :preview do
+  sh 'jekyll serve --watch'
+end