posterous-post.rb

#!/usr/bin/env ruby
#
# This is a simple script that allows you to post to Posterous from files on
# your computer. Currently accepted formats are HTML and markdown.
#
# USAGE
#
#   posterous-post my-post.mkd
#
# CONFIGURATION
#
# Create a file called .posterousrc in your home directory. This file should
# be in YAML format and have at least the keys 'email' and 'password', which
# are the email and password you use to log in to Posterous. You can also add
# the 'site_id' key, which tells Posterous to post to a site other than your
# personal blog.
#
# YAML FRONT MATTER
#
# Posts are given metadata using YAML front matter. This idea is taken from the
# Jekyll blog engine and it works the same way. You can read about it here:
#
# http://wiki.github.com/mojombo/jekyll/yaml-front-matter
#
# The following keys are available; all are optional: title, autopost, private,
# date, source, source_link
#
# UPDATING POSTS
#
# The first time you create a post, the file is updated with the post's ID in
# the YAML front matter. So, be sure to reload the file before editing it. If
# you then post the file again, it will update the blog post rather than
# creating a new one.
#
# DEPENDENCIES
#
# * Ruby
# * Rubygems
# * Nokogiri
# * RDiscount
#
require 'rubygems'
require 'net/http'
require 'date'
require 'rdiscount'
require 'nokogiri'

NEW_POST_URI = URI.parse("http://posterous.com/api/newpost")
UPDATE_POST_URI = URI.parse("http://posterous.com/api/updatepost")

config = File.open(File.join(ENV['HOME'], '.posterousrc')) do |file|
  YAML.load(file)
end

filename = ARGV[0]
post_meta, post_body = File.open(filename) do |file|
  post_meta_yaml = ''
  if file.gets =~ /^---\s*/
    while (line = file.gets) !~ /^---\s*/
      post_meta_yaml << line
    end
  else
    file.rewind
  end
  [YAML.load(post_meta_yaml), file.read]
end

post_meta ||= {}

new_post = !post_meta.has_key?('post_id')
uri = new_post ? NEW_POST_URI : UPDATE_POST_URI

request = Net::HTTP::Post.new(uri.path)
request.basic_auth(config['email'], config['password'])
form_data = {}
form_data['title'] = post_meta['title'] if post_meta['title']
form_data['body'] =
  case File.extname(filename)
  when '.mkd', '.markdown'
    RDiscount.new(post_body).to_html
  when '.html'
    post_body
  else
    abort "Didn't recognize extension #{File.extname(filename)}"
  end
if new_post
  form_data['site_id'] = config['site_id'] if config['site_id']
  form_data['autopost'] = post_meta['autopost'] ? 1 : 0
  form_data['private'] = post_meta['private'] ? 1 : 0
  form_data['date'] = Time.parse(post_meta['date']).utc.xmlschema if post_meta['date']
  form_data['source'] = post_meta['source'] if post_meta['source']
  form_data['sourceLink'] = post_meta['source_link'] if post_meta['source_link']
else
  form_data['post_id'] = post_meta['post_id']
end

request.set_form_data(form_data)
response = Net::HTTP.new(uri.host, uri.port).start do |http|
  http.request(request)
end
response_xml = Nokogiri::XML(response.body)

if response.code_type == Net::HTTPOK
  post_url = response_xml.xpath('rsp/post/longurl').text
  if new_post
    File.open(filename, 'w') do |file|
      post_meta['post_id'] = response_xml.xpath('rsp/post/id').text.to_i
      file.puts(YAML.dump(post_meta))
      file.puts('---')
      file.puts(post_body)
    end
    puts "Created post #{post_meta['title'].inspect} at #{post_url}"
  else
    puts "Updated post #{post_meta['title'].inspect} at #{post_url}"
  end
else
  abort(response_xml.xpath('rsp/err').attr('msg').text)
end