46 lines
1.4 KiB
Ruby
46 lines
1.4 KiB
Ruby
module Jekyll
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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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def self.calculate_pages(all_posts, per_page)
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num_pages = all_posts.size / per_page.to_i
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num_pages = num_pages + 1 if all_posts.size % per_page.to_i != 0
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num_pages
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end
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def self.pagination_enabled?(config, file)
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file == 'index.html' && !config['paginate'].nil?
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end
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def initialize(config, page, all_posts, num_pages = nil)
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@page = page
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@per_page = config['paginate'].to_i
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@total_pages = num_pages || Pager.calculate_pages(all_posts, @per_page)
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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 - 1 : nil
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@next_page = @page != @total_pages ? @page + 1 : nil
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end
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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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