Update MD026/MD030 to report fixInfo for violations.

lib/md030.js

@@ -2,8 +2,7 @@
 
 "use strict";
 
-const { addErrorDetailIf, listItemMarkerRe, rangeFromRegExp } =
-  require("../helpers");
+const { addErrorDetailIf } = require("../helpers");
 const { flattenedLists } = require("./cache");
 
 module.exports = {
@@ -22,10 +21,27 @@ module.exports = {
         (allSingle ? ulSingle : ulMulti) :
         (allSingle ? olSingle : olMulti);
       list.items.forEach((item) => {
-        const match = /^[\s>]*\S+(\s+)/.exec(item.line);
-        addErrorDetailIf(onError, item.lineNumber,
-          expectedSpaces, (match ? match[1].length : 0), null, null,
-          rangeFromRegExp(item.line, listItemMarkerRe));
+        const { line, lineNumber } = item;
+        const match = /^[\s>]*\S+(\s*)/.exec(line);
+        const [ { "length": matchLength }, { "length": actualSpaces } ] = match;
+        let fixInfo = null;
+        if ((expectedSpaces !== actualSpaces) && (line.length > matchLength)) {
+          fixInfo = {
+            "editColumn": matchLength - actualSpaces + 1,
+            "deleteCount": actualSpaces,
+            "insertText": "".padEnd(expectedSpaces)
+          };
+        }
+        addErrorDetailIf(
+          onError,
+          lineNumber,
+          expectedSpaces,
+          actualSpaces,
+          null,
+          null,
+          [ 1, matchLength ],
+          fixInfo
+        );
       });
     });
   }