text: // TODO number prefixes
  (function() {
    // Really primitive kill-ring implementation.
    var killRing = [];
    function addToRing(str) {
      killRing.push(str);
      if (killRing.length > 50) killRing.shift();
    }
    function getFromRing() { return killRing[killRing.length - 1] || ""; }
    function popFromRing() { if (killRing.length > 1) killRing.pop(); return getFromRing(); }
  
    CodeMirror.keyMap.emacs = {
      "Ctrl-X": function(cm) {cm.setOption("keyMap", "emacs-Ctrl-X");},
      "Ctrl-W": function(cm) {addToRing(cm.getSelection()); cm.replaceSelection("");},
      "Ctrl-Alt-W": function(cm) {addToRing(cm.getSelection()); cm.replaceSelection("");},
      "Alt-W": function(cm) {addToRing(cm.getSelection());},
      "Ctrl-Y": function(cm) {cm.replaceSelection(getFromRing());},
      "Alt-Y": function(cm) {cm.replaceSelection(popFromRing());},
      "Ctrl-/": "undo", "Shift-Ctrl--": "undo", "Shift-Alt-,": "goDocStart", "Shift-Alt-.": "goDocEnd",
      "Ctrl-S": "findNext", "Ctrl-R": "findPrev", "Ctrl-G": "clearSearch", "Shift-Alt-5": "replace",
      "Ctrl-Z": "undo", "Cmd-Z": "undo", "Alt-/": "autocomplete",
      fallthrough: ["basic", "emacsy"]
    };
  
    CodeMirror.keyMap["emacs-Ctrl-X"] = {
      "Ctrl-S": "save", "Ctrl-W": "save", "S": "saveAll", "F": "open", "U": "undo", "K": "close",
      auto: "emacs", nofallthrough: true
    };
  })();
  