From d51abbfe635b60ac97c698a62add330821c21645 Mon Sep 17 00:00:00 2001
From: Harald Eilertsen <haraldei@anduin.net>
Date: Wed, 4 Oct 2017 20:23:52 +0200
Subject: Add multi paginate plugin.

Inspired by https://github.com/fadhilnapis/jekyll-multi-paginate,
but completely rewritten for our needs.
---
 blog/_plugins/multi-paginate.rb | 46 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 blog/_plugins/multi-paginate.rb

diff --git a/blog/_plugins/multi-paginate.rb b/blog/_plugins/multi-paginate.rb
new file mode 100644
index 0000000..9978116
--- /dev/null
+++ b/blog/_plugins/multi-paginate.rb
@@ -0,0 +1,46 @@
+module Jekyll
+  class Paginate < Page
+    attr_accessor :pagination, :page_num
+    
+    def initialize(site, pagepath, pagination)
+      super(site, site.source, File.dirname(pagepath), File.basename(pagepath))
+      @pagination = pagination
+      @page_num = @pagination['num']
+      
+      self.data['pagination']=pagination
+      self.data.delete "paginate"
+    end
+
+    def url
+      orig = super
+      orig = File.join(orig, @page_num.to_s) if @page_num > 0
+      File.join(orig, 'index.html')
+    end
+  end
+
+  class MultiPaginateGenerator < Generator
+    safe true
+
+    def generate(site)
+      # We're only interested in pages with `paginate`set
+      paginate_pages = site.pages.reject { |page| page.data['paginate'].nil? }
+      paginate_pages.each do |page|
+        posts_per_page = page.data['paginate'].to_i
+        lang = page.data['lang']
+        posts_in_lang = site.posts.docs
+                          .reject { |post| post.data['lang'] != lang }
+                          .reverse
+        
+        num_pages = (posts_in_lang.length.to_f / posts_per_page.to_f).ceil
+        num_pages.times do |i|
+          page_posts = posts_in_lang.slice(i * posts_per_page, posts_per_page)
+          pagination = {
+            'posts' => page_posts,
+            'num' => i,
+          }
+          site.pages << Paginate.new(site, page.path, pagination)
+        end
+      end
+    end
+  end
+end
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