covert.rb

# encoding: utf-8

str = ''
File.open("tasks.md", 'r') do |f|
  str = f.read
end

str = str.gsub(/^###\s?(.*?)\s?$/, "<h3>\\1</h3>\n").
  gsub(/^任务：\s?(.*?)\n$/, "<div>\n<h3>\\1</h3>\n<ul>").
  gsub(/^\-\s+视频：\s?(.*?)$/, "</ul>\n<a href='\\1'>视频</a>\n</div>\n").
  gsub(/^\-\s?(.*?)$/, "<li>\\1</li>")
  
File.open("result.html", 'w') do |f|
  f.write(str)
end