Ruby script to convert Greymatter blog entries to Jekyll post format

gm2jekyll.rb

#!/usr/bin/env ruby
source_dir = ARGV[0]
dest_dir = ARGV[1]

def get_timestamp(components)
    month = components[0].to_i
    day = components[1].to_i
    year = components[2].to_i
    hour = components[3].to_i
    minute = components[4].to_i
    second = components[5].to_i
    ampm = components[6]
    if ampm == 'AM' and hour == 12
        hour = 0
    elsif ampm == 'PM' and hour < 12
        hour = hour + 12
    end
    Time.local(year, month, day, hour, minute, second)    
end

Dir.glob(File.join(source_dir, '*.cgi')).each do |file|
    content = File.readlines(file)
    
    # grab the post metadata
    metadata = content[0].split('|')
    title = metadata[2]
    timestamp = get_timestamp(metadata[4..10])
    puts "#{file} - #{timestamp.strftime('%Y-%m-%d %H:%M:%S')}: #{title}"
    
    # parse the rest of the file
    in_comments = false
    post_lines = []
    comment_lines = []
    content[2..-1].each do |line|
        if line=="\n"
            in_comments = true
        elsif in_comments
            comment_lines << line
        else
            post_lines << line
        end
    end

    jekyll_file = "#{timestamp.strftime('%Y-%m-%d-')}#{title.gsub(/\W/, '-')}".gsub(/-+/,'-').chomp('-')
    jekyll_file = jekyll_file + '.markdown'
    jekyll_path = File.join(dest_dir, jekyll_file)
    File.open(jekyll_path, 'w') do |file|
      file.write("---\n")
      file.write("layout: post\n")
      file.write("title:  \"#{title}\"\n")
      file.write("date:   #{timestamp.strftime('%Y-%m-%d %H:%M:%S')}\n")
      file.write("categories: \n")
      file.write("---\n")
      post_lines.each do |line|
          line.split('|*|').each do |subline|
              file.write(subline.gsub("<p>","").gsub("</p>",""))
              file.write("\n")
          end
      end
    end
end