Add bin and edit workflow

bin/gems/rouge-4.5.1/lib/rouge/lexers/literate_haskell.rb

@@ -0,0 +1,37 @@
+# -*- coding: utf-8 -*- #
+# frozen_string_literal: true
+
+module Rouge
+  module Lexers
+    class LiterateHaskell < RegexLexer
+      title "Literate Haskell"
+      desc 'Literate haskell'
+      tag 'literate_haskell'
+      aliases 'lithaskell', 'lhaskell', 'lhs'
+      filenames '*.lhs'
+      mimetypes 'text/x-literate-haskell'
+
+      def haskell
+        @haskell ||= Haskell.new(options)
+      end
+
+      start { haskell.reset! }
+
+      # TODO: support TeX versions as well.
+      state :root do
+        rule %r/\s*?\n(?=>)/, Text, :code
+        rule %r/.*?\n/, Text
+        rule %r/.+\z/, Text
+      end
+
+      state :code do
+        rule %r/(>)( .*?(\n|\z))/ do |m|
+          token Name::Label, m[1]
+          delegate haskell, m[2]
+        end
+
+        rule %r/\s*\n(?=\s*[^>])/, Text, :pop!
+      end
+    end
+  end
+end