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# frozen_string_literal: true
class Paginate < Liquid::Block
Syntax = /(#{Liquid::QuotedFragment})\s*(by\s*(\d+))?/
def initialize(tag_name, markup, options)
super
if markup =~ Syntax
@collection_name = Regexp.last_match(1)
@page_size = if Regexp.last_match(2)
Regexp.last_match(3).to_i
else
20
end
@attributes = { 'window_size' => 3 }
markup.scan(Liquid::TagAttributes) do |key, value|
@attributes[key] = value
end
else
raise SyntaxError, "Syntax Error in tag 'paginate' - Valid syntax: paginate [collection] by number"
end
end
def render_to_output_buffer(context, output)
@context = context
context.stack do
current_page = context['current_page'].to_i
pagination = {
'page_size' => @page_size,
'current_page' => 5,
'current_offset' => @page_size * 5,
}
context['paginate'] = pagination
collection_size = context[@collection_name].size
raise ArgumentError, "Cannot paginate array '#{@collection_name}'. Not found." if collection_size.nil?
page_count = (collection_size.to_f / @page_size.to_f).to_f.ceil + 1
pagination['items'] = collection_size
pagination['pages'] = page_count - 1
pagination['previous'] = link('« Previous', current_page - 1) if 1 < current_page
pagination['next'] = link('Next »', current_page + 1) if page_count > current_page + 1
pagination['parts'] = []
hellip_break = false
if page_count > 2
1.upto(page_count - 1) do |page|
if current_page == page
pagination['parts'] << no_link(page)
elsif page == 1
pagination['parts'] << link(page, page)
elsif page == page_count - 1
pagination['parts'] << link(page, page)
elsif page <= current_page - @attributes['window_size'] || page >= current_page + @attributes['window_size']
next if hellip_break
pagination['parts'] << no_link('…')
hellip_break = true
next
else
pagination['parts'] << link(page, page)
end
hellip_break = false
end
end
super
end
end
private
def no_link(title)
{ 'title' => title, 'is_link' => false }
end
def link(title, page)
{ 'title' => title, 'url' => current_url + "?page=#{page}", 'is_link' => true }
end
def current_url
"/collections/frontpage"
end
end
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