Porting a Rakefile for creating markdown (.md) pages with canned front-matter to Grunt's mkdirp plug-in

Rakefile

require "rubygems"
require "rake"
require "safe_yaml"

SOURCE = "."

# Creates a new markdown (.md) page in the root with predefined front-matter
# Spaces, duplicate names, and file extensions other than .md are not supported
# Run: $ rake new page=about

desc "Create a new page"
task :new do
  name = ENV["page"] || "new-page.md"
  filename = File.join(SOURCE, "#{name}\.md")
  title = File.basename(filename, File.extname(filename)).gsub(/\b\w/){$&.capitalize}
  tag = File.basename(filename, File.extname(filename)).gsub(/\b\w/){$&.downcase}
  if File.exist?(filename)
    abort("rake aborted!") if ask("#{filename} already exists. Do you want to overwrite?", ["y", "n"]) == "n"
  end

  mkdir_p File.dirname(filename)
  puts "Creating new page: #{filename}"
  open(filename, "w") do |post|
    post.puts "---"
    post.puts "layout: default"
    post.puts "title: #{title}"
    post.puts "intro: ""Add a short intro to describe this page"
    post.puts "tag: #{tag}"
    post.puts "baseurl: \"../\""
    post.puts "---"
  end
end