Add infrastructure for rules to include fix information when logging violations, update MD047 (refs #80).

lib/markdownlint.js

@@ -381,7 +381,8 @@ function lintContent(
         "lineNumber": errorInfo.lineNumber + frontMatterLines.length,
         "detail": errorInfo.detail || null,
         "context": errorInfo.context || null,
-        "range": errorInfo.range || null
+        "range": errorInfo.range || null,
+        "fixInfo": errorInfo.fixInfo || null
       });
     }
     // Call (possibly external) rule function
@@ -423,6 +424,9 @@ function lintContent(
           errorObject.errorDetail = error.detail;
           errorObject.errorContext = error.context;
           errorObject.errorRange = error.range;
+          if (resultVersion === 3) {
+            errorObject.fixInfo = error.fixInfo;
+          }
           return errorObject;
         });
       if (filteredErrors.length) {

lib/md047.js

@@ -12,7 +12,17 @@ module.exports = {
     const lastLineNumber = params.lines.length;
     const lastLine = params.lines[lastLineNumber - 1];
     if (!isBlankLine(lastLine)) {
-      addError(onError, lastLineNumber);
+      addError(
+        onError,
+        lastLineNumber,
+        null,
+        null,
+        null,
+        {
+          "insertText": "\n",
+          "editColumn": lastLine.length + 1
+        }
+      );
     }
   }
 };