#! /usr/bin/env ruby
# coding: utf-8

class Tefil::MdToFswiki < Tefil::TextFilterBase
  #def initialize(options)
  #  super(options)
  #end

  def process_stream(in_io, out_io)

    in_io.readlines.each do |line|
      # 行頭処理
      case
      when line.sub!(/^\#\#\#/  , '') then type = :head3
      when line.sub!(/^\#\#/    , '') then type = :head2
      when line.sub!(/^\#/      , '') then type = :head1
      when line.sub!(/^      \*/, '') then type = :item4
      when line.sub!(/^    \*/  , '') then type = :item3
      when line.sub!(/^  \*/    , '') then type = :item2
      when line.sub!(/^\*/      , '') then type = :item1
      when line.sub!(/^      0./, '') then type = :enum4
      when line.sub!(/^    0./  , '') then type = :enum3
      when line.sub!(/^  0./    , '') then type = :enum2
      when line.sub!(/^0./      , '') then type = :enum1
      when line.sub!(/^    /    , '') then type = :pre
      when line.sub!(/^---/     , '') then type = :hline
      else                                 type = :plain
      end

      # 行中要素の処理
      line.gsub!('**', "'''")
      line.gsub!('*' , "''"  )
      if /\[(.*)\]\((.*)\)/ =~ line # 複数ある場合は非対応。
        str = $1
        url = $2
        line.sub!(/\[(.*)\]\((.*)\)/, "\[#{str}|#{url}\]")
      end

      case
      when type == :head3 then line.sub!(/^/, '!'     )
      when type == :head2 then line.sub!(/^/, '!!'    )
      when type == :head1 then line.sub!(/^/, '!!!'   )
      when type == :item4 then line.sub!(/^/, '****'  )
      when type == :item3 then line.sub!(/^/, '***'   )
      when type == :item2 then line.sub!(/^/, '**'    )
      when type == :item1 then line.sub!(/^/, '*'     )
      when type == :enum4 then line.sub!(/^/, '++++'  )
      when type == :enum3 then line.sub!(/^/, '+++'   )
      when type == :enum2 then line.sub!(/^/, '++'    )
      when type == :enum1 then line.sub!(/^/, '+'     )
      when type == :pre   then line.sub!(/^/, ' '     )
      when type == :hline then line.sub!(/^/, '----'  )
      else # type == :pain  then  'do nothing'
      end

      # 出力
      out_io.puts line
    end
  end
end