samhuri.net/bin/harp2swift

#!/usr/bin/env ruby -w
# encoding: utf-8

require 'rubygems'
require 'time'
require 'bundler/setup'
require 'builder'
require 'json'
require 'rdiscount'
require 'mustache'

class Hash
  def compact
    h = {}
    each_pair do |k, v|
      h[k] = v unless v.nil?
    end
    h
  end
end

def main
  dir = ARGV.shift.to_s
  unless File.directory? dir
    puts 'usage: harp2swift <dir>'
    exit 1
  end
  b = Blag.new dir
  b.migrate!
end

class Blag

  def initialize dir
    @dir = dir
  end

  def migrate!
    migrate_posts
  end

  def migrate_posts
    Dir[File.join(@dir, 'posts/*/*')].sort.map do |dir|
      next unless File.directory?(dir) && dir =~ /\/\d\d$/
      year, month = dir.split('/')[-2..-1]
      data_json = File.read File.join(dir, '_data.json') rescue nil
      next unless data_json
      data = JSON.parse data_json
      data.each do |slug, post|
        post_path = File.join dir, "#{slug}.md"
        plain_md = File.read post_path
        if plain_md[0, 3] == '---'
          puts ">>>> Skipping #{post_path} which already has metadata"
          next
        end
        author = post['author'] && post['author'] != "" ? post['author'] : 'Sami Samhuri'
        headers = {
          'Title' => post['title'],
          'Author' => author,
          'Date' => post['date'],
          'Timestamp' => post['timestamp'],
          'Tags' => post['tags'].join(', '),
        }
        if post['link']
          headers['Link'] = post['link']
        end
        header_string = headers.map { |name, value| "#{name}: #{value}" }.join("\n")
        fancy_md = <<-EOT
---
#{header_string}
---

#{plain_md}
        EOT
        File.write post_path, fancy_md
        puts ">>>> Migrated #{post_path}"
      end
    end
  end # def migrate_posts

end # class Blag

main if $0 == __FILE__