download images from links in your posts, and update with new links

update_blog_images_link.rb

# encoding: utf-8

require 'open-uri'
require 'iconv'

dir = Dir.getwd.to_s
puts dir
entries = Dir.entries(dir + '/_posts')
ic = Iconv.new('UTF-8//IGNORE', 'UTF-8')
your_own_domain = "http://fengqijun.me"
puts "starting download images..."
images_file_hash = Hash.new
entries.each do |e|
	file_path = dir + '/_posts/' + e.to_s
	unless File.directory?(file_path)
		file = File.open(file_path)
		contents = ic.iconv(file.read)
		file.close
		contents.scan(Regexp.new(your_own_domain + '(.*?)\.(jpg|jpeg|png)')).each do |src|
			image_url = your_own_domain + "#{src[0]}.#{src[1]}"

			images_file_hash[image_url] = file_path
			comps = image_url.split('/');
			dir_path = dir + '/_posts/' + comps[-3] + '-' + comps[-2]
			if not File.directory?(dir_path)
				Dir.mkdir(dir_path, 0777)
			end
			index = image_url.rindex('/')

			puts "saving to #{dir_path}"
			File.open(dir_path + '/' + comps[-1], "wb") do |saved_file|
				open(image_url, 'rb') do |read_file|
					saved_file.write(read_file.read)
				end
			end
		end
	end
end

images_file_hash.each do |image_url, file_path|
	new_image_url = image_url.sub('2012/', '2012-').sub('fengqijun.me/wp-content/uploads', 'images.fengqijun.me')
	puts new_image_url
	file = File.open(file_path, "r")
	contents = ic.iconv(file.read)
	file.close
	puts new_image_url
	contents = contents.gsub(image_url, new_image_url)
	new_file = File.open(file_path, "w+")
	new_file.write(contents);
	new_file.close
end