Rakefile

require "rubygems"
require "rake"
require 'time'

SOURCE = "."
CONFIG = {
  'layouts' => File.join(SOURCE, "_layouts"),
  'posts' => File.join(SOURCE, "_posts"),
  'post_ext' => "md",
}

desc "Generate Jekyll site"
task :generate do
  puts "Generating site with Jekyll..."
  exec(<<-CMD)
    set -e
    jekyll --no-auto --pygments;
    sass --update _sass:_site/css -f -r ./_sass/bourbon/lib/bourbon.rb;
    git checkout gh-pages;
    cp -r _site/* .;
    rm -Rf _site;
    rm -Rf .sass-cache;
    rm -Rf _cache;
    git add .;
    git commit -m "updating gh-pages";
    git checkout master;
  CMD
end # task :generate

task :default => [:watch]

desc "Watch the site and regenerate when it changes"
task :watch do
  puts "Starting to watch source with Jekyll and Sass..."
  system "sass --update _sass:css -f -l -r ./_sass/bourbon/lib/bourbon.rb"
  jekyllPid = Process.spawn("jekyll --auto --server")
  sassPid = Process.spawn("sass --watch _sass:css -l -r ./_sass/bourbon/lib/bourbon.rb")

  trap("INT") {
    [jekyllPid, sassPid].each { |pid| Process.kill(9, pid) rescue Errno::ESRCH }
    exit 0
  }

  [jekyllPid, sassPid].each { |pid| Process.wait(pid) }
end # task :watch

desc "Publish gh-pages to the appropriate repo/branch"
task :publish do
  exec(<<-CMD)
    set -e
    git push origin gh-pages:gh-pages
  CMD
end

# Usage: rake post title="A Title" [date="2012-02-09"]
desc "Begin a new post in #{CONFIG['posts']}"
task :post do
  abort("rake aborted: '#{CONFIG['posts']}' directory not found.") unless FileTest.directory?(CONFIG['posts'])
  title = ENV["title"] || "new-post"
  slug = title.downcase.strip.gsub(' ', '-').gsub(/[^\w-]/, '')
  begin
    date = (ENV['date'] ? Time.parse(ENV['date']) : Time.now).strftime('%Y-%m-%d')
  rescue Exception => e
    puts "Error - date format must be YYYY-MM-DD, please check you typed it correctly!"
    exit -1
  end
  filename = File.join(CONFIG['posts'], "#{date}-#{slug}.#{CONFIG['post_ext']}")
  if File.exist?(filename)
    abort("rake aborted!") if ask("#{filename} already exists. Do you want to overwrite?", ['y', 'n']) == 'n'
  end

  puts "Creating new post: #{filename}"
  open(filename, 'w') do |post|
    post.puts "---"
    post.puts "layout: post"
    post.puts "title: \"#{title.gsub(/-/,' ')}\""
    post.puts "---"
  end
end # task :post

def ask(message, valid_options)
  if valid_options
    answer = get_stdin("#{message} #{valid_options.to_s.gsub(/"/, '').gsub(/, /,'/')} ") while !valid_options.include?(answer)
  else
    answer = get_stdin(message)
  end
  answer
end

def get_stdin(message)
  print message
  STDIN.gets.chomp
end