Rakefile to manage jekyll commands

Rakefile

desc 'Begin a new post'
task :post do   
  ROOT_DIR = File.dirname(__FILE__)

  title = ARGV[1]
  tags = ARGV[2 ]

  unless title
    puts %{Usage: rake post "The Post Title"}
    exit(-1)
  end

  datetime = Time.now.strftime('%Y-%m-%d')  # 30 minutes from now.
  slug = title.strip.downcase.gsub(/ /, '-')

  path = "#{ROOT_DIR}/_posts/#{datetime}-#{slug}.markdown"

  header = <<-END
---
layout: post
title: #{title}
date: #{Time.now}
excerpt: 
tag: #{tags}

---

END

  File.open(path, 'w') {|f| f << header }
  system("subl", path)    
end


desc 'build static files'
task :build do
  `rm -rf _site && jekyll`
end

desc 'preview local blogs'
task :preview do
  `open "http://localhost:4000"`
end

desc 'start jekyll server'
task :server do
  `jekyll --server 4000 --auto`
end

desc 'deploy on the server'
task :deploy do
  `ssh -t webuser@xxx.xxx.xxx.xxx 'cd /home/webuser/www/gchen.cn && git pull'`
end