Redmine

# Taken from http://stackoverflow.com/questions/9782121/how-to-convert-existing-redmine-wiki-from-textile-to-markdown

# Modified to be compatible with newer Pandoc versions with "markdown_strict" format

task :convert_textile_to_markdown => :environment do

  require 'tempfile'

  WikiContent.all.each do |wiki|

    ([wiki] + wiki.versions).each do |version|

      textile = version.text

      src = Tempfile.new('textile')

      src.write(textile)

      src.close

      dst = Tempfile.new('markdown')

      dst.close

      command = [

        "pandoc",

        "--no-wrap",

        "--smart",

        "-f",

        "textile",

        "-t",

        "markdown_strict",

        src.path,

        "-o",

        dst.path,

      ]

      system(*command) or raise "pandoc failed"

      dst.open

      markdown = dst.read

      # remove the \ pandoc puts before * and > at begining of lines

      markdown.gsub!(/^((\\[*>])+)/) { $1.gsub("\\", "") }

      # add a blank line before lists

      markdown.gsub!(/^([^*].*)\n\*/, "\\1\n\n*")

      version.update_attribute(:text, markdown)

    end

  end

end