Update MD013/line-length to permit long link/image reference definitions in all modes because they can not be easily split.

demo/markdownlint-browser.js

@@ -764,6 +764,7 @@ function getReferenceLinkImageData(lineMetadata) {
     const shortcuts = new Set();
     const definitions = new Map();
     const duplicateDefinitions = [];
+    const definitionLineIndices = [];
     // Define helper functions
     const normalizeLabel = (s) => s.toLowerCase().trim().replace(/\s+/g, " ");
     const exclusions = [];
@@ -804,6 +805,11 @@ function getReferenceLinkImageData(lineMetadata) {
                 }
                 const labelLength = linkReferenceDefinitionMatch[0].length;
                 exclusions.push([0, lineOffsets[lineIndex], labelLength]);
+                const hasDefinition = line.slice(labelLength).trim().length > 0;
+                definitionLineIndices.push(lineIndex);
+                if (!hasDefinition) {
+                    definitionLineIndices.push(lineIndex + 1);
+                }
             }
         }
     });
@@ -876,7 +882,8 @@ function getReferenceLinkImageData(lineMetadata) {
         references,
         shortcuts,
         definitions,
-        duplicateDefinitions
+        duplicateDefinitions,
+        definitionLineIndices
     };
 }
 module.exports.getReferenceLinkImageData = getReferenceLinkImageData;
@@ -2832,8 +2839,8 @@ module.exports = {
 "use strict";
 // @ts-check
 
-const { addErrorDetailIf, filterTokens, forEachHeading, forEachLine, includesSorted, linkReferenceDefinitionRe } = __webpack_require__(/*! ../helpers */ "../helpers/helpers.js");
-const { lineMetadata } = __webpack_require__(/*! ./cache */ "../lib/cache.js");
+const { addErrorDetailIf, filterTokens, forEachHeading, forEachLine, includesSorted } = __webpack_require__(/*! ../helpers */ "../helpers/helpers.js");
+const { lineMetadata, referenceLinkImageData } = __webpack_require__(/*! ./cache */ "../lib/cache.js");
 const longLineRePrefix = "^.{";
 const longLineRePostfixRelaxed = "}.*\\s.*$";
 const longLineRePostfixStrict = "}.+$";
@@ -2888,6 +2895,7 @@ module.exports = {
                 linkOnlyLineNumbers.push(token.lineNumber);
             }
         });
+        const { definitionLineIndices } = referenceLinkImageData();
         forEachLine(lineMetadata(), (line, lineIndex, inCode, onFence, inTable) => {
             const lineNumber = lineIndex + 1;
             const isHeading = includesSorted(headingLineNumbers, lineNumber);
@@ -2900,10 +2908,10 @@ module.exports = {
             if ((includeCodeBlocks || !inCode) &&
                 (includeTables || !inTable) &&
                 (includeHeadings || !isHeading) &&
+                !includesSorted(definitionLineIndices, lineIndex) &&
                 (strict ||
                     (!(stern && sternModeRe.test(line)) &&
-                        !includesSorted(linkOnlyLineNumbers, lineNumber) &&
-                        !linkReferenceDefinitionRe.test(line))) &&
+                        !includesSorted(linkOnlyLineNumbers, lineNumber))) &&
                 lengthRe.test(line)) {
                 addErrorDetailIf(onError, lineNumber, length, line.length, null, null, [length + 1, line.length - length]);
             }

doc-build/md013.md

@@ -7,11 +7,11 @@ up into multiple lines. To set a different maximum length for headings, use
 `code_block_line_length`
 
 This rule has an exception when there is no whitespace beyond the configured
-line length. This allows you to still include items such as long URLs without
-being forced to break them in the middle. To disable this exception, set the
-`strict` parameter to `true` to report an issue when any line is too long.
-To warn for lines that are too long and could be fixed but allow lines without
-spaces, set the `stern` parameter to `true`.
+line length. This allows you to include items such as long URLs without being
+forced to break them in the middle. To disable this exception, set the `strict`
+parameter to `true` and an issue will be reported when any line is too long. To
+warn for lines that are too long and could be fixed but allow long lines
+without spaces, set the `stern` parameter to `true`.
 
 For example (assuming normal behavior):
 
@@ -32,5 +32,9 @@ Code blocks are included in this rule by default since it is often a
 requirement for document readability, and tentatively compatible with code
 rules. Still, some languages do not lend themselves to short lines.
 
+Lines with link/image reference definitions are always exempted from this rule
+(even in `strict` mode) because there is generally no way to split such lines
+without breaking the URL.
+
 Rationale: Extremely long lines can be difficult to work with in some editors.
 More information: <https://cirosantilli.com/markdown-style-guide#line-wrapping>.

doc/Rules.md

@@ -557,11 +557,11 @@ up into multiple lines. To set a different maximum length for headings, use
 `code_block_line_length`
 
 This rule has an exception when there is no whitespace beyond the configured
-line length. This allows you to still include items such as long URLs without
-being forced to break them in the middle. To disable this exception, set the
-`strict` parameter to `true` to report an issue when any line is too long.
-To warn for lines that are too long and could be fixed but allow lines without
-spaces, set the `stern` parameter to `true`.
+line length. This allows you to include items such as long URLs without being
+forced to break them in the middle. To disable this exception, set the `strict`
+parameter to `true` and an issue will be reported when any line is too long. To
+warn for lines that are too long and could be fixed but allow long lines
+without spaces, set the `stern` parameter to `true`.
 
 For example (assuming normal behavior):
 
@@ -582,6 +582,10 @@ Code blocks are included in this rule by default since it is often a
 requirement for document readability, and tentatively compatible with code
 rules. Still, some languages do not lend themselves to short lines.
 
+Lines with link/image reference definitions are always exempted from this rule
+(even in `strict` mode) because there is generally no way to split such lines
+without breaking the URL.
+
 Rationale: Extremely long lines can be difficult to work with in some editors.
 More information: <https://cirosantilli.com/markdown-style-guide#line-wrapping>.
 

doc/md013.md

@@ -25,11 +25,11 @@ up into multiple lines. To set a different maximum length for headings, use
 `code_block_line_length`
 
 This rule has an exception when there is no whitespace beyond the configured
-line length. This allows you to still include items such as long URLs without
-being forced to break them in the middle. To disable this exception, set the
-`strict` parameter to `true` to report an issue when any line is too long.
-To warn for lines that are too long and could be fixed but allow lines without
-spaces, set the `stern` parameter to `true`.
+line length. This allows you to include items such as long URLs without being
+forced to break them in the middle. To disable this exception, set the `strict`
+parameter to `true` and an issue will be reported when any line is too long. To
+warn for lines that are too long and could be fixed but allow long lines
+without spaces, set the `stern` parameter to `true`.
 
 For example (assuming normal behavior):
 
@@ -50,5 +50,9 @@ Code blocks are included in this rule by default since it is often a
 requirement for document readability, and tentatively compatible with code
 rules. Still, some languages do not lend themselves to short lines.
 
+Lines with link/image reference definitions are always exempted from this rule
+(even in `strict` mode) because there is generally no way to split such lines
+without breaking the URL.
+
 Rationale: Extremely long lines can be difficult to work with in some editors.
 More information: <https://cirosantilli.com/markdown-style-guide#line-wrapping>.

helpers/helpers.js

@@ -797,6 +797,7 @@ function getReferenceLinkImageData(lineMetadata) {
   const shortcuts = new Set();
   const definitions = new Map();
   const duplicateDefinitions = [];
+  const definitionLineIndices = [];
   // Define helper functions
   const normalizeLabel = (s) => s.toLowerCase().trim().replace(/\s+/g, " ");
   const exclusions = [];
@@ -838,6 +839,11 @@ function getReferenceLinkImageData(lineMetadata) {
         }
         const labelLength = linkReferenceDefinitionMatch[0].length;
         exclusions.push([ 0, lineOffsets[lineIndex], labelLength ]);
+        const hasDefinition = line.slice(labelLength).trim().length > 0;
+        definitionLineIndices.push(lineIndex);
+        if (!hasDefinition) {
+          definitionLineIndices.push(lineIndex + 1);
+        }
       }
     }
   });
@@ -914,7 +920,8 @@ function getReferenceLinkImageData(lineMetadata) {
     references,
     shortcuts,
     definitions,
-    duplicateDefinitions
+    duplicateDefinitions,
+    definitionLineIndices
   };
 }
 module.exports.getReferenceLinkImageData = getReferenceLinkImageData;

lib/md013.js

@@ -3,8 +3,8 @@
 "use strict";
 
 const { addErrorDetailIf, filterTokens, forEachHeading, forEachLine,
-  includesSorted, linkReferenceDefinitionRe } = require("../helpers");
-const { lineMetadata } = require("./cache");
+  includesSorted } = require("../helpers");
+const { lineMetadata, referenceLinkImageData } = require("./cache");
 
 const longLineRePrefix = "^.{";
 const longLineRePostfixRelaxed = "}.*\\s.*$";
@@ -67,6 +67,7 @@ module.exports = {
         linkOnlyLineNumbers.push(token.lineNumber);
       }
     });
+    const { definitionLineIndices } = referenceLinkImageData();
     forEachLine(lineMetadata(), (line, lineIndex, inCode, onFence, inTable) => {
       const lineNumber = lineIndex + 1;
       const isHeading = includesSorted(headingLineNumbers, lineNumber);
@@ -79,10 +80,10 @@ module.exports = {
       if ((includeCodeBlocks || !inCode) &&
           (includeTables || !inTable) &&
           (includeHeadings || !isHeading) &&
+          !includesSorted(definitionLineIndices, lineIndex) &&
           (strict ||
            (!(stern && sternModeRe.test(line)) &&
-            !includesSorted(linkOnlyLineNumbers, lineNumber) &&
-            !linkReferenceDefinitionRe.test(line))) &&
+            !includesSorted(linkOnlyLineNumbers, lineNumber))) &&
           lengthRe.test(line)) {
         addErrorDetailIf(
           onError,

test/long-lines-long-reference-definitions-stern.md

@@ -0,0 +1,23 @@
+# Long Lines Long Reference Definitions Stern
+
+[Link][short-reference-definition]
+
+[Link][long-reference-definition]
+
+[Link][long-reference-definition-split]
+
+![Image][long-reference-definition-image]
+
+[short-reference-definition]: https://example.com/short
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-split]:
+  https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image
+<!-- markdownlint-disable-next-line link-image-reference-definitions -->
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long
+
+<!-- markdownlint-configure-file {
+  "line-length": {
+    "stern": true
+  }
+} -->

test/long-lines-long-reference-definitions-strict.md

@@ -0,0 +1,23 @@
+# Long Lines Long Reference Definitions Strict
+
+[Link][short-reference-definition]
+
+[Link][long-reference-definition]
+
+[Link][long-reference-definition-split]
+
+![Image][long-reference-definition-image]
+
+[short-reference-definition]: https://example.com/short
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-split]:
+  https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image
+<!-- markdownlint-disable-next-line link-image-reference-definitions -->
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long
+
+<!-- markdownlint-configure-file {
+  "line-length": {
+    "strict": true
+  }
+} -->

test/long-lines-long-reference-definitions.md

@@ -0,0 +1,17 @@
+# Long Lines Long Reference Definitions
+
+[Link][short-reference-definition]
+
+[Link][long-reference-definition]
+
+[Link][long-reference-definition-split]
+
+![Image][long-reference-definition-image]
+
+[short-reference-definition]: https://example.com/short
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-split]:
+  https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long
+[long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image
+<!-- markdownlint-disable-next-line link-image-reference-definitions -->
+[long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long

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

@@ -27784,6 +27784,96 @@ Generated by [AVA](https://avajs.dev).
       `,
     }
 
+## long-lines-long-reference-definitions-stern.md
+
+> Snapshot 1
+
+    {
+      errors: [],
+      fixed: `# Long Lines Long Reference Definitions Stern␊
+      ␊
+      [Link][short-reference-definition]␊
+      ␊
+      [Link][long-reference-definition]␊
+      ␊
+      [Link][long-reference-definition-split]␊
+      ␊
+      ![Image][long-reference-definition-image]␊
+      ␊
+      [short-reference-definition]: https://example.com/short␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-split]:␊
+        https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image␊
+      <!-- markdownlint-disable-next-line link-image-reference-definitions -->␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      ␊
+      <!-- markdownlint-configure-file {␊
+        "line-length": {␊
+          "stern": true␊
+        }␊
+      } -->␊
+      `,
+    }
+
+## long-lines-long-reference-definitions-strict.md
+
+> Snapshot 1
+
+    {
+      errors: [],
+      fixed: `# Long Lines Long Reference Definitions Strict␊
+      ␊
+      [Link][short-reference-definition]␊
+      ␊
+      [Link][long-reference-definition]␊
+      ␊
+      [Link][long-reference-definition-split]␊
+      ␊
+      ![Image][long-reference-definition-image]␊
+      ␊
+      [short-reference-definition]: https://example.com/short␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-split]:␊
+        https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image␊
+      <!-- markdownlint-disable-next-line link-image-reference-definitions -->␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      ␊
+      <!-- markdownlint-configure-file {␊
+        "line-length": {␊
+          "strict": true␊
+        }␊
+      } -->␊
+      `,
+    }
+
+## long-lines-long-reference-definitions.md
+
+> Snapshot 1
+
+    {
+      errors: [],
+      fixed: `# Long Lines Long Reference Definitions␊
+      ␊
+      [Link][short-reference-definition]␊
+      ␊
+      [Link][long-reference-definition]␊
+      ␊
+      [Link][long-reference-definition-split]␊
+      ␊
+      ![Image][long-reference-definition-image]␊
+      ␊
+      [short-reference-definition]: https://example.com/short␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-split]:␊
+        https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      [long-reference-definition-image]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long/image␊
+      <!-- markdownlint-disable-next-line link-image-reference-definitions -->␊
+      [long-reference-definition]: https://example.com/long/long/long/long/long/long/long/long/long/long/long/long/long␊
+      `,
+    }
+
 ## long-lines-short-code.md
 
 > Snapshot 1