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121 lines
4.0 KiB
121 lines
4.0 KiB
module Jekyll
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class Pagination < Generator
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# This generator is safe from arbitrary code execution.
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safe true
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# Generate paginated pages if necessary.
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#
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# site - The Site.
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#
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# Returns nothing.
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def generate(site)
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site.pages.dup.each do |page|
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paginate(site, page) if Pager.pagination_enabled?(site.config, page)
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end
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end
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# Paginates the blog's posts. Renders the index.html file into paginated
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# directories, e.g.: page2/index.html, page3/index.html, etc and adds more
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# site-wide data.
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#
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# site - The Site.
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# page - The index.html Page that requires pagination.
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#
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# {"paginator" => { "page" => <Number>,
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# "per_page" => <Number>,
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# "posts" => [<Post>],
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# "total_posts" => <Number>,
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# "total_pages" => <Number>,
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# "previous_page" => <Number>,
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# "next_page" => <Number> }}
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def paginate(site, page)
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all_posts = site.site_payload['site']['posts']
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pages = Pager.calculate_pages(all_posts, site.config['paginate'].to_i)
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page_dir = page.destination('').sub(/\/[^\/]+$/, '')
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page_dir_config = site.config['pagination_dir']
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dir = ((page_dir_config || page_dir) + '/').sub(/^\/+/, '')
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(1..pages).each do |num_page|
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pager = Pager.new(site.config, num_page, all_posts, pages, page_dir+'/', '/'+dir)
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if num_page > 1
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newpage = Page.new(site, site.source, page_dir, page.name)
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newpage.pager = pager
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newpage.dir = File.join(page.dir, "#{dir}page/#{num_page}")
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site.pages << newpage
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else
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page.pager = pager
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end
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end
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end
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end
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class Pager
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attr_reader :page, :per_page, :posts, :total_posts, :total_pages, :previous_page, :next_page
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# Calculate the number of pages.
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#
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# all_posts - The Array of all Posts.
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# per_page - The Integer of entries per page.
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#
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# Returns the Integer number of pages.
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def self.calculate_pages(all_posts, per_page)
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(all_posts.size.to_f / per_page.to_i).ceil
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end
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# Determine if pagination is enabled for a given file.
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#
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# config - The configuration Hash.
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# file - The String filename of the file.
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#
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# Returns true if pagination is enabled, false otherwise.
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def self.pagination_enabled?(config, file)
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file.name == 'index.html' && !config['paginate'].nil? && file.content =~ /paginator\./
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end
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# Initialize a new Pager.
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#
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# config - The Hash configuration of the site.
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# page - The Integer page number.
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# all_posts - The Array of all the site's Posts.
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# num_pages - The Integer number of pages or nil if you'd like the number
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# of pages calculated.
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def initialize(config, page, all_posts, num_pages = nil, index_dir, pagination_dir)
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@page = page
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@per_page = config['paginate'].to_i
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@page_dir = pagination_dir + 'page/'
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@total_pages = num_pages || Pager.calculate_pages(all_posts, @per_page)
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@previous_page = nil
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if @page > @total_pages
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raise RuntimeError, "page number can't be greater than total pages: #{@page} > #{@total_pages}"
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end
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init = (@page - 1) * @per_page
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offset = (init + @per_page - 1) >= all_posts.size ? all_posts.size : (init + @per_page - 1)
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@total_posts = all_posts.size
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@posts = all_posts[init..offset]
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@previous_page = @page != 1 ? @page_dir + (@page - 1).to_s + '/' : nil
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@previous_page = index_dir if @page - 1 == 1
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@next_page = @page != @total_pages ? @page_dir + (@page + 1).to_s + '/' : nil
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end
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# Convert this Pager's data to a Hash suitable for use by Liquid.
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#
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# Returns the Hash representation of this Pager.
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def to_liquid
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{
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'page' => page,
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'per_page' => per_page,
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'posts' => posts,
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'total_posts' => total_posts,
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'total_pages' => total_pages,
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'previous_page' => previous_page,
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'next_page' => next_page
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}
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end
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end
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end
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