#
# autopagerize.rb - tDiary plugin
#
# add <link rel="prev"> and <link rel="next"> tags for AutoPagerize
#
# Copyright (C) 2008 MATSUI Shinsuke <poppen@karashi.org>
# You can redistribute it and/or modify it under GPL2.
#

#
# HTML header
#
def index_page_tag
	result = ''
	if @index_page and @index_page.size > 0 then
		result << %Q[<link rel="index" title="#{h navi_index}" href="#{h @index_page}">\n\t]
	end

	case @mode
	when 'day'
		if @prev_day then
			result << %Q[<link rel="next" title="#{navi_prev_diary( Time::local(*@prev_day.scan(/^(\d{4})(\d\d)(\d\d)$/)[0]) )}" href="#{h @index}#{anchor @prev_day}">\n\t]
		end
		if @next_day then
			result << %Q[<link rel="prev" title="#{navi_next_diary( Time::local(*@next_day.scan(/^(\d{4})(\d\d)(\d\d)$/)[0]) )}" href="#{h @index}#{anchor @next_day}">\n\t]
		end
	when 'nyear'
		if @prev_day then
			result << %Q[<link rel="next" title="#{navi_prev_nyear( Time::local(*@prev_day.scan(/^(\d{4})(\d\d)(\d\d)$/)[0]) )}" href="#{h @index}#{anchor @prev_day[4,4]}">\n\t]
		end
		if @next_day then
			result << %Q[<link rel="prev" title="#{h navi_next_nyear( Time::local(*@next_day.scan(/^(\d{4})(\d\d)(\d\d)$/)[0]) )}" href="#{h @index}#{anchor @next_day[4,4]}">\n\t]
		end
	when 'month'
		unless (months = _create_month).empty? then
			prev_month = months['prev_month']
			next_month = months['next_month']
			if prev_month then
				result << %Q[<link rel="next" title="#{h navi_prev_month}" href="#{h @index}#{anchor( prev_month )}">\n\t]
			end
			if next_month then
				result << %Q[<link rel="prev" title="#{h navi_next_month}" href="#{h @index}#{anchor( next_month )}">\n\t]
			end
		end
	when 'latest'
		if @conf['ndays.prev'] then
			result << %Q[<link rel="next" title="#{h navi_prev_ndays}" href="#{h @index}#{anchor( @conf['ndays.prev'] + '-' + @conf.latest_limit.to_s )}">\n\t]
		end
		if @conf['ndays.next'] then
			result << %Q[<link rel="prev" title="#{h navi_next_ndays}" href="#{h @index}#{anchor( @conf['ndays.next'] + '-' + @conf.latest_limit.to_s )}">\n\t]
		end
	end
	result << %Q[<link rel="start" title="#{navi_latest}" href="#{h @index}">\n\t]
	result.chop.chop
end

def _create_month
	result = {}
	ym = []
	@years.keys.each do |y|
		ym += @years[y].collect {|m| y + m}
	end
	ym.sort!
	now = @date.strftime( '%Y%m' )
	return '' unless ym.index( now )
	result['prev_month'] = ym.index( now ) == 0 ? nil : ym[ym.index( now )-1]
	result['next_month'] = ym[ym.index( now )+1]
	result
end

# Local Variables:
# mode: ruby
# indent-tabs-mode: t
# tab-width: 3
# ruby-indent-level: 3
# End:
# vi: ts=3 sw=3