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module Jekyll
class PrevNextTag < Liquid::Tag
def initialize(tag_name, text, tokens)
super
@tag = tag_name
@text = text
end
def render(context)
page = context['page']
other_page = case @tag
when "link_to_prev_page" then find_prev(page)
when "link_to_next_page" then find_next(page)
else nil
end
if other_page
%Q{<a href="#{other_page['url']}">#{@text} #{other_page['title']}</a>}
else
""
end
end
private
def find_prev(obj)
n = obj.previous
loop do
if n && n['lang'] != obj['lang']
n = n.previous
else
break
end
end
return n
end
def find_next(obj)
n = obj.next
loop do
if n && n['lang'] != obj['lang']
n = n.next
else
break
end
end
return n
end
end
end
Liquid::Template.register_tag('link_to_next_page', Jekyll::PrevNextTag)
Liquid::Template.register_tag('link_to_prev_page', Jekyll::PrevNextTag)
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