3 files changed, 154 insertions, 0 deletions
diff --git a/_plugins/filters.rb b/_plugins/filters.rb
new file mode 100644
index 0000000..78eb04f
--- /dev/null
+++ b/_plugins/filters.rb
@@ -0,0 +1,25 @@
+module Filters
+	def datefmt(input)
+		return input.strftime("%F")
+	end
+
+	def sentence_join(items, fallback = "")
+		return fallback if items == nil or items.length == 0
+		return "#{items[0]}" if items.length == 1
+		return "#{items[0..-2].join(", ")} and #{items[-1]}"
+	end
+
+	def plural(num, counter)
+		return "#{num} #{counter}#{num == 1 ? '' : 's'}"
+	end
+
+	def post_sort(posts, sort_by)
+		# date (reverse chronological)
+		return posts.sort_by{ |post| -post.data['date'].to_i } if sort_by == "date"
+		# title (case insensitive)
+		return posts.sort_by{ |post| post.data['title'].downcase } if sort_by == "title"
+	end
+end
+
+Liquid::Template.register_filter(Filters)
+
diff --git a/_plugins/meta.rb b/_plugins/meta.rb
new file mode 100644
index 0000000..0e25871
--- /dev/null
+++ b/_plugins/meta.rb
@@ -0,0 +1,67 @@
+class Meta < Jekyll::Generator
+	def generate(site)
+		# convert yaml @0123456789 (unix timestamps) into ruby Date
+		site.data = parse_unix_dates(site.data)
+
+		posts = site.collections['items']
+		for page in posts do
+			# convert generated page metadata and add directly to `page.meta` in liquid
+			page.data['meta'] = transform_data(site, page.data['slug'])
+
+			# set page.authors to author metadata from git+yaml
+			page.data['authors'] = site.data['authors'].filter do |author|
+				author['git'].intersect?(page.data['meta']['authors'])
+			end
+
+			# set page.date to generated date_initial
+			page.data['date'] = page.data['meta']['date']
+		end
+
+		# count tags on all posts
+		site.data['tags'] = count_tags(posts)
+	end
+
+	def parse_unix_dates(data)
+		# recurse deeper
+		return data.transform_values { |val| parse_unix_dates(val) } if data.is_a? Hash
+		return data.map { |val| parse_unix_dates(val) } if data.is_a? Array
+
+		# convert strings matching regex
+		return Time.at(Integer(data[1..])) if data.is_a? String and data =~ /^@\d+$/
+
+		# base case
+		return data
+	end
+
+	def transform_data(site, slug)
+		data = site.data['post'][slug]
+		data['git_log'] = data['git_log'].sort { |c| c['date'].to_i }
+
+		git_log = data['git_log'].filter do |commit|
+			!site.data['git']['ignore_commits'].include?(commit['hash'])
+		end
+
+		data['authors'] = git_log.map{ |c| c['author'] }.uniq
+		data['date_initial'] = git_log.first['date']
+		data['date'] = git_log.last['date']
+		data['edits'] = git_log.length - 1 # original commit is not an edit
+		return data
+	end
+
+	def count_tags(posts)
+		tags = {}
+
+		# tally tags
+		for post in posts do
+			for tag in post.data['tags'] do
+				tags[tag] = tags.fetch(tag, 0) + 1
+			end
+		end
+
+		# sort by post count descending
+		tags = tags.sort_by {|key,value| -value}
+
+		return tags
+	end
+end
+
diff --git a/_plugins/toc.rb b/_plugins/toc.rb
new file mode 100644
index 0000000..09ef946
--- /dev/null
+++ b/_plugins/toc.rb
@@ -0,0 +1,62 @@
+require 'nokogiri'
+
+class TOC < Liquid::Tag
+	def render context
+		# load HTML into nokogiri
+		html = context.registers[:page]['content']
+		doc = Nokogiri::HTML(html)
+
+		# enumerate over all h1-4 headings
+		@els = doc.css("h1, h2, h3, h4")
+		toc = output_toc()
+		return '' if toc.empty?
+		return '<aside id="toc" class="plainlink">%s</aside>' % [ toc ]
+	end
+
+	def output_toc
+		# empty toc (this check prevents crash)
+		return "" if @els.length == 0
+
+		output = '<ul>'
+
+		current_level = el_level(@els[0])
+
+		while @els.length > 0
+			el = @els[0]
+			el_next = @els[1]
+			level = el_level(el)
+			level_next = el_level(el_next || el) # || el to prevent crash on end of list
+
+			if level >= level_next
+				output += '<li>'
+			else
+				output += '<li class="stub"><details>'
+				output += '<summary>'
+			end
+
+			output += '<a href="#%s">%s</a>' % [ el['id'], el.inner_html ]
+			@els.shift()
+
+			if level >= level_next
+				output += '</li>'
+			else
+				output += '</summary>'
+				output += output_toc
+				output += '</details></li>'
+			end
+
+			break if level_next < level
+		end
+
+		output += '</ul>'
+
+		return output
+	end
+
+	def el_level el
+		return Integer(el.name[1..])
+	end
+end
+
+Liquid::Template.register_tag('toc', TOC)
+