"Single File" version of cats2tags.rb. Takes a single Octopress/Jekyll markdown file as an argument. Reads "categories" from YAML and applies those as OpenMeta tags. Run with a Hazel rule.

tags2.rb

#!/usr/bin/ruby

# By Neal Sheeran www.nealsheeran.com
#
# Single version of cats2tags.rb 
# Receives a file name (Octopress markdown file)
# as an argument and processes the YAML frontmatter.
# The categories are written to the file as OpenMeta tags.
#
# Hazel is used to execute this script on a folder of markdown files:
#  IF ALL
#    Date Last Modified is after Date Last Matched
#    Extension is 'markdown'
#  Do:
#    Run shell script (embedded):  "ruby tags2.rb $1"

require 'yaml'

post = ARGV[0]

readin = YAML.load_file(post)
title = readin['title']
tags = readin['categories'].join(', ')

%x{/usr/local/bin/openmeta -a #{tags} -p #{post}}

# For testing /  command-line use 
puts "#{post} = #{title}: #{tags}"