Add support for eRuby

http://www2a.biglobe.ne.jp/~seki/ruby/erb.html

rc/filetype/eruby.kak

@@ -0,0 +1,26 @@
+# eRuby
+# http://www2a.biglobe.ne.jp/~seki/ruby/erb.html
+
+hook global BufCreate '.*\.html\.erb' %{
+  set-option buffer filetype eruby
+}
+
+hook global WinSetOption filetype=eruby %{
+  require-module eruby
+  add-highlighter window/eruby ref eruby
+  hook -group eruby window InsertChar '\n' html-indent-on-new-line
+  hook -always -once window WinSetOption filetype=.* %{
+    remove-highlighter window/eruby
+    remove-hooks window eruby
+  }
+}
+
+provide-module eruby %{
+  require-module ruby
+  require-module html
+  add-highlighter shared/eruby regions
+  add-highlighter shared/eruby/html default-region ref html
+  add-highlighter shared/eruby/simple-expression-tag region '<%=' '%>' ref ruby
+  add-highlighter shared/eruby/simple-execution-tag region '<%' '%>' ref ruby
+  add-highlighter shared/eruby/simple-comment-tag region '<%#' '%>' fill comment
+}