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✏️ Editing: rulers.js

// CodeMirror, copyright (c) by Marijn Haverbeke and others
// Distributed under an MIT license: https://codemirror.net/LICENSE

(function(mod) {
  if (typeof exports == "object" && typeof module == "object") // CommonJS
    mod(require("../../lib/codemirror"));
  else if (typeof define == "function" && define.amd) // AMD
    define(["../../lib/codemirror"], mod);
  else // Plain browser env
    mod(CodeMirror);
})(function(CodeMirror) {
  "use strict";

CodeMirror.defineOption("rulers", false, function(cm, val) {
    if (cm.state.rulerDiv) {
      cm.state.rulerDiv.parentElement.removeChild(cm.state.rulerDiv)
      cm.state.rulerDiv = null
      cm.off("refresh", drawRulers)
    }
    if (val && val.length) {
      cm.state.rulerDiv = cm.display.lineSpace.parentElement.insertBefore(document.createElement("div"), cm.display.lineSpace)
      cm.state.rulerDiv.className = "CodeMirror-rulers"
      drawRulers(cm)
      cm.on("refresh", drawRulers)
    }
  });

MR SKB