/
pager.rb
45 lines (38 loc) · 1.39 KB
/
pager.rb
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module Jekyll
class Pager
attr_reader :page, :per_page, :posts, :total_posts, :total_pages, :previous_page, :next_page
def self.calculate_pages(all_posts, per_page)
num_pages = all_posts.size / per_page.to_i
num_pages.abs + 1 if all_posts.size % per_page.to_i != 0
num_pages
end
def self.pagination_enabled?(config, file)
file == 'index.html' && !config['paginate'].nil?
end
def initialize(config, page, all_posts, num_pages = nil)
@page = page
@per_page = config['paginate'].to_i
@total_pages = num_pages || Pager.calculate_pages(all_posts, @per_page)
if @page > @total_pages
raise RuntimeError, "page number can't be greater than total pages: #{@page} > #{@total_pages}"
end
init = (@page - 1) * @per_page
offset = (init + @per_page - 1) >= all_posts.size ? all_posts.size : (init + @per_page - 1)
@total_posts = all_posts.size
@posts = all_posts[init..offset]
@previous_page = @page != 1 ? @page - 1 : nil
@next_page = @page != @total_pages ? @page + 1 : nil
end
def to_hash
{
'page' => page,
'per_page' => per_page,
'posts' => posts,
'total_posts' => total_posts,
'total_pages' => total_pages,
'previous_page' => previous_page,
'next_page' => next_page
}
end
end
end