Remove maximum-line-length warnings on definitions

Closes GH-21.

doc/rules.md

@@ -661,7 +661,7 @@ Options: `boolean`, default: `false`.
   Options: `number`, default: `80`.
 
   Ignores nodes which cannot be wrapped, such as heasings, tables,
-  code, link, and images.
+  code, link, images, and definitions.
 
 ### no-auto-link-without-protocol
 

lib/rules/maximum-line-length.js

@@ -8,7 +8,7 @@
  *   Options: `number`, default: `80`.
  *
  *   Ignores nodes which cannot be wrapped, such as heasings, tables,
- *   code, link, and images.
+ *   code, link, images, and definitions.
  * @example
  *   <!-- Valid, when set to `40` -->
  *   Alpha bravo charlie delta echo.
@@ -53,10 +53,11 @@ var end = position.end;
  * @return {boolean} - Whether or not `node` should be
  *   ignored.
  */
-function isApplicable(node) {
+function isIgnored(node) {
     return node.type === 'heading' ||
         node.type === 'table' ||
-        node.type === 'code';
+        node.type === 'code' ||
+        node.type === 'definition';
 }
 
 /**
@@ -96,7 +97,7 @@ function maximumLineLength(ast, file, preferred, done) {
      */
 
     visit(ast, function (node) {
-        var applicable = isApplicable(node);
+        var applicable = isIgnored(node);
         var initial = applicable && start(node).line;
         var final = applicable && end(node).line;
 

mdast-lint.js

@@ -2654,7 +2654,7 @@ module.exports = maximumHeadingLength;
  *   Options: `number`, default: `80`.
  *
  *   Ignores nodes which cannot be wrapped, such as heasings, tables,
- *   code, link, and images.
+ *   code, link, images, and definitions.
  * @example
  *   <!-- Valid, when set to `40` -->
  *   Alpha bravo charlie delta echo.
@@ -2699,10 +2699,11 @@ var end = position.end;
  * @return {boolean} - Whether or not `node` should be
  *   ignored.
  */
-function isApplicable(node) {
+function isIgnored(node) {
     return node.type === 'heading' ||
         node.type === 'table' ||
-        node.type === 'code';
+        node.type === 'code' ||
+        node.type === 'definition';
 }
 
 /**
@@ -2742,7 +2743,7 @@ function maximumLineLength(ast, file, preferred, done) {
      */
 
     visit(ast, function (node) {
-        var applicable = isApplicable(node);
+        var applicable = isIgnored(node);
         var initial = applicable && start(node).line;
         var final = applicable && end(node).line;
 

test/fixtures/maximum-line-length-valid.md

@@ -18,3 +18,7 @@ This is also fine: <http://this-long-url-with-a-long-domain.co.uk/a-long-path?qu
 The following is also fine, because there is no white-space.
 
 <http://this-long-url-with-a-long-domain-is-invalid.co.uk/a-long-path?query=variables>.
+
+In addition, definitions are also fine:
+
+[foo]: <http://this-long-url-with-a-long-domain-is-invalid.co.uk/a-long-path?query=variables>