Rakefile to write a Jekyll post easily.

Rakefile

require 'yaml'
require 'time'
require 'fileutils'
require 'uuidtools'

CONFIG_YML = File.expand_path('../_config.yml', __FILE__)
CONFIG = YAML.load(File.read(CONFIG_YML, encoding: 'UTF-8'))

SOURCE_DIR = File.expand_path(CONFIG['source'] || File.dirname(__FILE__))

desc 'Write a post'
task :write do
  begin
    print 'Title: '
    title = STDIN.gets.chop
  end while title == ''
  slug = title.gsub(/\s+/, '-').gsub(/[^\w-]+/, '').downcase

  date = nil
  print 'Date (yyyy-mm-dd, optional): '
  input = STDIN.gets.chop
  unless input.empty?
    begin
      date = Time.iso8601(input)
    rescue ArgumentError
      puts 'The date format is invalid. Use current date instead.'
    end
  end
  date = Time.now if date.nil?

  post_dir = File.join(SOURCE_DIR, '_posts')
  FileUtils.mkdir_p post_dir

  path = "#{post_dir}/#{date.strftime('%Y-%m-%d')}-#{slug}.markdown"
  abort "#{path} already exists" if File.exist?(path)
  File.write(path, <<-EOS, encoding: 'UTF-8')
---
layout: post
uuid: #{UUIDTools::UUID.random_create.to_s}
title: #{title}
tags:
---
  EOS

  if ENV['EDITOR']
    system(ENV['EDITOR'], path)
  else
    puts "Edit '#{pat}'"
  end
end