Update MD013/line-length with new code_block_line_length parameter (fixes #184).

doc/Rules.md

@@ -443,14 +443,15 @@ Tags: line_length
 
 Aliases: line-length
 
-Parameters: line_length, heading_line_length, code_blocks, tables, headings, headers (number; default 80, boolean; default true)
+Parameters: line_length, heading_line_length, code_block_line_length, code_blocks, tables, headings, headers (number; default 80, boolean; default true)
 
 > If `headings` is not provided, `headers` (deprecated) will be used.
 
 This rule is triggered when there are lines that are longer than the
 configured `line_length` (default: 80 characters). To fix this, split the line
 up into multiple lines. To set a different maximum length for headings, use
-`heading_line_length`.
+`heading_line_length`. To set a different maximum length for code blocks, use
+`code_block_line_length`
 
 This rule has an exception where there is no whitespace beyond the configured
 line length. This allows you to still include items such as long URLs without

lib/md013.js

@@ -27,10 +27,13 @@ module.exports = {
   "function": function MD013(params, onError) {
     const lineLength = params.config.line_length || 80;
     const headingLineLength = params.config.heading_line_length || lineLength;
+    const codeLineLength = params.config.code_block_line_length || lineLength;
     const longLineRe =
       new RegExp(longLineRePrefix + lineLength + longLineRePostfix);
     const longHeadingLineRe =
       new RegExp(longLineRePrefix + headingLineLength + longLineRePostfix);
+    const longCodeLineRe =
+      new RegExp(longLineRePrefix + codeLineLength + longLineRePostfix);
     const codeBlocks = params.config.code_blocks;
     const includeCodeBlocks = (codeBlocks === undefined) ? true : !!codeBlocks;
     const tables = params.config.tables;
@@ -59,8 +62,12 @@ module.exports = {
     forEachLine(lineMetadata(), (line, lineIndex, inCode, onFence, inTable) => {
       const lineNumber = lineIndex + 1;
       const isHeading = includesSorted(headingLineNumbers, lineNumber);
-      const length = isHeading ? headingLineLength : lineLength;
-      const lengthRe = isHeading ? longHeadingLineRe : longLineRe;
+      const length = inCode ?
+        codeLineLength :
+        (isHeading ? headingLineLength : lineLength);
+      const lengthRe = inCode ?
+        longCodeLineRe :
+        (isHeading ? longHeadingLineRe : longLineRe);
       if ((includeCodeBlocks || !inCode) &&
           (includeTables || !inTable) &&
           (includeHeadings || !isHeading) &&

schema/build-config-schema.js

@@ -134,6 +134,11 @@ rules.forEach(function forRule(rule) {
           "type": "integer",
           "default": 80
         },
+        "code_block_line_length": {
+          "description": "Number of characters for code blocks",
+          "type": "integer",
+          "default": 80
+        },
         "code_blocks": {
           "description": "Include code blocks",
           "type": "boolean",

schema/markdownlint-config-schema.json

@@ -379,6 +379,11 @@
           "type": "integer",
           "default": 80
         },
+        "code_block_line_length": {
+          "description": "Number of characters for code blocks",
+          "type": "integer",
+          "default": 80
+        },
         "code_blocks": {
           "description": "Include code blocks",
           "type": "boolean",
@@ -420,6 +425,11 @@
           "type": "integer",
           "default": 80
         },
+        "code_block_line_length": {
+          "description": "Number of characters for code blocks",
+          "type": "integer",
+          "default": 80
+        },
         "code_blocks": {
           "description": "Include code blocks",
           "type": "boolean",

test/long-lines-short-code.json

@@ -0,0 +1,7 @@
+{
+  "default": true,
+  "MD013": {
+    "code_block_line_length": 30
+  },
+  "MD046": false
+}

test/long-lines-short-code.md

@@ -0,0 +1,25 @@
+# Long Lines, Short Code
+
+Text text text text text text text text text text text text text text text
+
+Text text text text text text text text text text text text text text text text text {MD013}
+
+Text
+
+    Code code code code
+
+Text
+
+    Code code code code code code code {MD013}
+
+Text
+
+```text
+Code code code code code
+```
+
+Text
+
+```text
+Code code code code code code code code {MD013}
+```