Update MD018/MD019/MD020/MD021 to report fixInfo for violations.

lib/md019.js

@@ -2,20 +2,37 @@
 
 "use strict";
 
-const { addErrorContext, atxHeadingSpaceRe, filterTokens, headingStyleFor,
-  rangeFromRegExp } = require("../helpers");
+const { addErrorContext, filterTokens, headingStyleFor } =
+  require("../helpers");
 
 module.exports = {
   "names": [ "MD019", "no-multiple-space-atx" ],
   "description": "Multiple spaces after hash on atx style heading",
   "tags": [ "headings", "headers", "atx", "spaces" ],
   "function": function MD019(params, onError) {
-    filterTokens(params, "heading_open", function forToken(token) {
-      if ((headingStyleFor(token) === "atx") &&
-          /^#+\s\s/.test(token.line)) {
-        addErrorContext(onError, token.lineNumber, token.line.trim(),
-          null, null,
-          rangeFromRegExp(token.line, atxHeadingSpaceRe));
+    filterTokens(params, "heading_open", (token) => {
+      if (headingStyleFor(token) === "atx") {
+        const { line, lineNumber } = token;
+        const match = /^(#+)(\s{2,})/.exec(line);
+        if (match) {
+          const [
+            ,
+            { "length": hashLength },
+            { "length": spacesLength }
+          ] = match;
+          addErrorContext(
+            onError,
+            lineNumber,
+            line.trim(),
+            null,
+            null,
+            [ 1, hashLength + spacesLength + 1 ],
+            {
+              "editColumn": hashLength + 1,
+              "deleteCount": spacesLength - 1
+            }
+          );
+        }
       }
     });
   }