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# redMine - project management software

# Copyright (C) 2006-2007  Jean-Philippe Lang

#

# This program is free software; you can redistribute it and/or

# modify it under the terms of the GNU General Public License

# as published by the Free Software Foundation; either version 2

# of the License, or (at your option) any later version.

# 

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

# 

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

module WikiHelper

  def wiki_page_options_for_select(pages, selected = nil, parent = nil, level = 0)

    s = ''

    pages.select {|p| p.parent == parent}.each do |page|

      attrs = "value='#{page.id}'"

      attrs << " selected='selected'" if selected == page

      indent = (level > 0) ? (' ' * level * 2 + '» ') : nil

      s << "<option #{attrs}>#{indent}#{h page.pretty_title}</option>\n" + 

             wiki_page_options_for_select(pages, selected, page, level + 1)

    end

    s

  end

  def html_diff(wdiff)

    words = wdiff.words.collect{|word| h(word)}

    words_add = 0

    words_del = 0

    dels = 0

    del_off = 0

    wdiff.diff.diffs.each do |diff|

      add_at = nil

      add_to = nil

      del_at = nil

      deleted = ""            

      diff.each do |change|

        pos = change[1]

        if change[0] == "+"

          add_at = pos + dels unless add_at

          add_to = pos + dels

          words_add += 1

        else

          del_at = pos unless del_at

          deleted << ' ' + h(change[2])

          words_del         += 1

        end

      end

      if add_at

        words[add_at] = '<span class="diff_in">' + words[add_at]

        words[add_to] = words[add_to] + '</span>'

      end

      if del_at

        words.insert del_at - del_off + dels + words_add, '<span class="diff_out">' + deleted + '</span>'

        dels += 1

        del_off += words_del

        words_del = 0

      end

    end

    simple_format_without_paragraph(words.join(' '))

  end

end