admin(major): add YAMLField for attributes, add codemirror editor

passbook/admin/static/codemirror/mode/ruby/test.js

@@ -0,0 +1,23 @@
+// CodeMirror, copyright (c) by Marijn Haverbeke and others
+// Distributed under an MIT license: https://codemirror.net/LICENSE
+
+(function() {
+  var mode = CodeMirror.getMode({indentUnit: 2}, "ruby");
+  function MT(name) { test.mode(name, mode, Array.prototype.slice.call(arguments, 1)); }
+
+  MT("divide_equal_operator",
+     "[variable bar] [operator /=] [variable foo]");
+
+  MT("divide_equal_operator_no_spacing",
+     "[variable foo][operator /=][number 42]");
+
+  MT("complex_regexp",
+     "[keyword if] [variable cr] [operator =~] [string-2 /(?: \\( #{][tag RE_NOT][string-2 }\\( | #{][tag RE_NOT_PAR_OR][string-2 }* #{][tag RE_OPA_OR][string-2 } )/][variable x]")
+
+  MT("indented_heredoc",
+     "[keyword def] [def x]",
+     "  [variable y] [operator =] [string <<-FOO]",
+     "[string     bar]",
+     "[string   FOO]",
+     "[keyword end]")
+})();