image.rb

require "open-uri"

# Pull images from markdown files

class Image
  class << self
    def download
      links.each do |link|
        filename = link.split("/")[-1]
        remote_file = open(link)
        IO.copy_stream(remote_file, "./image/#{filename}")
      end
    end

    def links
      result = []
      regex = /\(.*\)/
      markdown_image_links.each do |md_link|
        match = regex.match(md_link)
        result << match[0][1..-2]
      end
      result
    end

    def markdown_image_links
      result = []
      markdown_files.each do |file|
        result |= File.readlines(file).select { |line| line =~ /(!\[.*?\]\()(.+?)(\))/ }
      end
      result
    end

    def markdown_files
      Dir["./**/*.md"]
    end
  end
end