Rake task I use for starting a new article for Production Ready

Rakefile

require "stringex"

desc "Create a new letter"
task :new_letter, :title do |t, args|
  title = args[:title] || "New Letter"
  num = File::basename(Dir['letters/*'].last)[0,3].to_i + 1
  filename = "letters/%03d-%s.md" % [num, title.to_url]
  date = Time.now.strftime("%Y-%m-%d")

  puts "==> Creating new letter: #{filename}"
  content = <<EOS
---
title: "#{title.to_html(true)}"
subtitle:
date: #{date}
tags: []
medium:
photo:
mentions:
---

Add awesome content here.
EOS
  File.write(filename, content)

  git "checkout", "-b", title.to_url
  git "add", filename
  git "commit", "-m", "Add draft: #{title}"

  open_in_editor(filename)
end

def open_in_editor(filename)
  sh "open", "-a", "/Applications/Byword.app", filename
end

def git(*args)
  sh "git", *args
end