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# Paginate a collection | |
# | |
# Usage: | |
# | |
# {% paginate contents.projects by 5 %} | |
# {% for project in paginate.collection %} | |
# {{ project.name }} | |
# {% endfor %} | |
# {% endpaginate %} | |
# | |
class Paginate < ::Liquid::Block | |
Syntax = /(#{::Liquid::Expression}+)\s+by\s+([0-9]+)/ | |
def initialize(tag_name, markup, tokens) | |
if markup =~ Syntax | |
@collection_name = $1 | |
@per_page = $2.to_i | |
else | |
raise ::Liquid::SyntaxError.new("Syntax Error in 'paginate' - Valid syntax: paginate <collection> by <number>") | |
end | |
super | |
end | |
def render(context) | |
context.stack do | |
collection = context[@collection_name] | |
params = context.registers[:controller].params.clone | |
raise ::Liquid::ArgumentError.new("Cannot paginate array '#{@collection_name}'. Not found.") if collection.nil? | |
pagination = collection.send(:paginate, { | |
:include => [:images, :master], | |
:page => params[:page], | |
:per_page => @per_page }) | |
context[@collection_name] = pagination | |
page_count, current_page = pagination.total_pages, pagination.current_page | |
path = context.registers[:controller].request.path | |
params.delete(:page) if params[:page] | |
params.delete(:action) if params[:action] | |
params.delete(:controller) if params[:controller] | |
params.delete(:id) if params[:id] | |
params.delete(:store_name) if params[:store_name] | |
pagination_context = {} | |
pagination_context['previous'] = link("« #{I18n.t('previous')}", current_page - 1, path, params) if pagination.previous_page | |
pagination_context['next'] = link("#{I18n.t('next')} »", current_page + 1, path, params) if pagination.next_page | |
pagination_context['parts'] = [] | |
hellip_break = false | |
if page_count > 1 | |
1.upto(page_count) do |page| | |
if current_page == page | |
pagination_context['parts'] << no_link(page) | |
elsif page == 1 | |
pagination_context['parts'] << link(page, page, path, params) | |
elsif page == page_count - 1 | |
pagination_context['parts'] << link(page, page, path, params) | |
elsif page <= current_page - window_size or page >= current_page + window_size | |
next if hellip_break | |
pagination_context['parts'] << no_link('…') | |
hellip_break = true | |
next | |
else | |
pagination_context['parts'] << link(page, page, path, params) | |
end | |
hellip_break = false | |
end | |
end | |
context['paginate'] = pagination_context | |
render_all(@nodelist, context) | |
end | |
end | |
private | |
def window_size | |
3 | |
end | |
def no_link(title) | |
{ 'title' => title, 'is_link' => false, 'hellip_break' => title == '…' } | |
end | |
def link(title, page, path, params = {}) | |
params[:page] = page | |
{ 'title' => title, 'url' => "#{path}?#{params.to_query}", 'is_link' => true} | |
end | |
end |
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