Add support for delta line numbers to test scenario tagging syntax: {MD000:+3}.

test/markdownlint-test-scenarios.js

@@ -37,18 +37,25 @@ function createTestForFile(file) {
               error.ruleInformation.replace(/v\d+\.\d+\.\d+/, "v0.0.0");
         }
         // Match identified issues by MD### markers
-        const marker = /\{(MD\d+)(?::(\d+))?\}/g;
+        const marker = /\{(MD\d+)(?::([-+]?)(\d+))?\}/g;
         const lines = content.split(helpers.newLineRe);
         const expected = {};
         // @ts-ignore
         for (const [ index, line ] of lines.entries()) {
           let match = null;
           while ((match = marker.exec(line))) {
-            const rule = match[1];
+            const [ , rule, delta, value ] = match;
+            let lineNumber = index + 1;
+            if (value) {
+              const valueInt = Number.parseInt(value, 10);
+              if (delta) {
+                lineNumber += ((delta === "+") ? 1 : -1) * valueInt;
+              } else {
+                lineNumber = valueInt;
+              }
+            }
             // eslint-disable-next-line no-multi-assign
             const indices = expected[rule] = expected[rule] || [];
-            const lineNumber =
-              match[2] ? Number.parseInt(match[2], 10) : index + 1;
             if (!indices.includes(lineNumber)) {
               indices.push(lineNumber);
             }

test/proper-names-no-code.md

@@ -16,7 +16,7 @@ Execute `via the node.js engine`
     node.js is runtime
 
 ```js
-javascript is code {MD046:18}
+javascript is code {MD046:-1}
 node.js is runtime
 ```
 

test/proper-names-urls.md

@@ -50,7 +50,7 @@ Text [https://example.com/directory/text.file](https://example.com/directory/tex
 Text [https://example.com/directory/text%20text.file](https://example.com/directory/text%20text.file) text
 Text [https://example.com/directory/text%20text.file](https://example.com/directory/text%20text.file) text
 
-{MD044:55}
+{MD044:+2}
 
 <!-- markdownlint-configure-file {
   "proper-names": {

test/proper-names.md

@@ -50,7 +50,7 @@ HTML <u>javascript</u> {MD044}
     node.js is runtime {MD044}
 
 ```javascript
-javascript is code {MD044} {MD046:52}
+javascript is code {MD044} {MD046:-1}
 node.js is runtime {MD044}
 ```
 
@@ -92,7 +92,7 @@ Text referencing mULTIPLEcASE name.
 <img src="img/javascript/image.png" alt="Description" error="{MD044}">
 
 <script type="text/javascript">
-{MD044:94}
+{MD044:-1}
 javascript {MD044}
 </script>
 
@@ -118,7 +118,7 @@ javascript {MD044}
   javascript {MD044}
 </div>
 
-{MD044:107} {MD044:109} {MD044:112} {MD044:117}
+{MD044:-14} {MD044:-12} {MD044:-9} {MD044:-4}
 
 <!-- markdownlint-configure-file {
   "no-inline-html": false,

test/snapshots/markdownlint-test-scenarios.js.md

@@ -41815,7 +41815,7 @@ Generated by [AVA](https://avajs.dev).
           node.js is runtime␊
       ␊
       \`\`\`js␊
-      javascript is code {MD046:18}␊
+      javascript is code {MD046:-1}␊
       node.js is runtime␊
       \`\`\`␊
       ␊
@@ -42649,7 +42649,7 @@ Generated by [AVA](https://avajs.dev).
       Text [https://example.com/directory/text%20text.file](https://example.com/directory/text%20text.file) text␊
       Text [https://example.com/directory/text%20text.file](https://example.com/directory/text%20text.file) text␊
       ␊
-      {MD044:55}␊
+      {MD044:+2}␊
       ␊
       <!-- markdownlint-configure-FILE {␊
         "proper-names": {␊
@@ -43560,7 +43560,7 @@ Generated by [AVA](https://avajs.dev).
           Node.js is runtime {MD044}␊
       ␊
       \`\`\`javascript␊
-      JavaScript is code {MD044} {MD046:52}␊
+      JavaScript is code {MD044} {MD046:-1}␊
       Node.js is runtime {MD044}␊
       \`\`\`␊
       ␊
@@ -43602,7 +43602,7 @@ Generated by [AVA](https://avajs.dev).
       <img src="img/JavaScript/image.png" alt="Description" error="{MD044}">␊
       ␊
       <script type="text/JavaScript">␊
-      {MD044:94}␊
+      {MD044:-1}␊
       JavaScript {MD044}␊
       </script>␊
       ␊
@@ -43628,7 +43628,7 @@ Generated by [AVA](https://avajs.dev).
         JavaScript {MD044}␊
       </div>␊
       ␊
-      {MD044:107} {MD044:109} {MD044:112} {MD044:117}␊
+      {MD044:-14} {MD044:-12} {MD044:-9} {MD044:-4}␊
       ␊
       <!-- markdownlint-configure-file {␊
         "no-inline-html": false,␊