1 files changed, 67 insertions, 0 deletions
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
+