1 files changed, 38 insertions, 0 deletions
diff --git a/_plugins/authors.rb b/_plugins/authors.rb
new file mode 100644
index 0000000..a2e0a53
--- /dev/null
+++ b/_plugins/authors.rb
@@ -0,0 +1,38 @@
+require 'set'
+
+module Jekyll
+	class FormatAuthors < Liquid::Tag
+		def initialize(tag_name, input, tokens)
+			super
+			@args = input.split(" ").map { |arg| arg.strip() }
+		end
+
+		def transform_authors(author_meta, git_authors)
+			authors = Set[]
+			for substitute in author_meta do
+				for name in substitute['git'] do
+					if git_authors.include?(name)
+						authors.add(substitute['name'])
+					end
+				end
+			end
+			return authors.to_a()
+		end
+
+		def join_names(authors)
+			return "nobody?" if authors.length == 0
+			return "#{authors[0]}" if authors.length == 1
+			return "#{authors[0..-2].join(", ")} and #{authors[-1]}"
+		end
+
+		def render(context)
+			author_meta = context[@args[0]]
+			git_authors = context[@args[1]]
+			authors = transform_authors(author_meta, git_authors)
+			return join_names(authors)
+		end
+	end
+end
+
+Liquid::Template.register_tag('fmt_authors', Jekyll::FormatAuthors)
+