Ship jekyll-docs properly

jekyll-docs/.gitignore

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+jekyll
+site
+Gemfile.lock

jekyll-docs/Gemfile

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+source 'https://rubygems.org'
+gemspec

jekyll-docs/Rakefile

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+require "bundler/gem_tasks"
+task :build => :init
+task :default => :init
+
+def jekyll_version
+  ENV.fetch('JEKYLL_VERSION')
+end
+
+task :init do
+  sh "git clone git://github.com/jekyll/jekyll.git jekyll" unless Dir.exist? "jekyll/.git"
+  Dir.chdir("jekyll") { sh "git checkout v#{jekyll_version}" }
+  rm_rf "site"
+  cp_r "jekyll/site", "site"
+end
+
+task :teardown do
+  rm_rf "site"
+  rm_rf "jekyll"
+end

jekyll-docs/jekyll-docs.gemspec

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+# coding: utf-8
+require File.expand_path('../../lib/jekyll/version', __FILE__)
+
+Gem::Specification.new do |spec|
+  spec.name          = 'jekyll-docs'
+  spec.version       = ENV.fetch('JEKYLL_VERSION')
+  spec.authors       = ['Parker Moore']
+  spec.email         = ['parkrmoore@gmail.com']
+  spec.summary       = %q{Offline usage documentation for Jekyll.}
+  spec.homepage      = 'http://jekyllrb.com'
+  spec.license       = 'MIT'
+
+  spec.files         = `git ls-files -z`.split("\x0").grep(%r{^site/})
+  spec.files << "lib/jekyll-docs.rb"
+  spec.require_paths = ['lib']
+
+  spec.add_dependency 'jekyll', Jekyll::VERSION
+
+  spec.add_development_dependency 'bundler', '~> 1.7'
+  spec.add_development_dependency 'rake', '~> 10.0'
+end

jekyll-docs/lib/jekyll-docs.rb

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+require 'rubygems'
+require 'jekyll'
+
+module JekyllDocs
+  class DocsCommand < Jekyll::Command
+    class << self
+      def init_with_program(prog)
+        prog.command(:docs) do |cmd|
+          cmd.description "Start a local server for the Jekyll documentation"
+          cmd.syntax "docs [options]"
+          cmd.alias :d
+
+          cmd.option "port", "-P", "--port", "Port to listen on."
+
+          cmd.action do |_, opts|
+            JekyllDocs::DocsCommand.process(opts)
+          end
+        end
+      end
+
+      def process(opts)
+        Dir.mktmpdir do |dest_dir|
+          Jekyll::Commands::Serve.process(opts.merge({
+            "serving"     => true,
+            "watch"       => false,
+            "config"      => File.expand_path("../../site/_config.yml", __FILE__),
+            "source"      => File.expand_path("../../site/", __FILE__),
+            "destination" => dest_dir
+          }))
+        end
+      end
+    end
+  end
+end