Read the categories of a directory of Jekyll/Octopress markdown posts and write those categories as OpenMeta tags

cats2tags.rb

#!/usr/bin/ruby

# By Neal Sheeran www.nealsheeran.com
#
# Script to read the categories of all Jekyll/Octopress markdown
# posts in a directory and write those categories to the file 
# as OpenMeta tags. 
#
# Currently only allows for single-word tags: 'web design'
# will be written as two separate tags - 'web' and 'design'
# 
# YAML categories should be in the form:
# categories: [blog, design, typography]
#
# Big Thanks to Brett Terpstra (@tscoff) for his assistance.
#
# Set ARCHIVE to a correct directory (and extension)

require 'yaml'

archive = "#{ENV['HOME']}/Dropbox/Archive/OctopressPosts/*.markdown"

Dir.glob(archive) do |post|
  readin = YAML.load_file(post)
  title = readin['title']
  tags = readin['categories'].join(', ')
  
  %x{/usr/local/bin/openmeta -a #{tags} -p #{post}}
    
  puts "#{title}: #{tags}" # For possible output when used on command line
end