Add support for commonmark definition mode

Author: wooorm

lib/index.js

@@ -13,10 +13,11 @@ var footer = require('./footer');
 
 /* Factory to transform. */
 function factory(tree, options) {
-  var dangerous = (options || {}).allowDangerousHTML;
+  var settings = options || {};
+  var dangerous = settings.allowDangerousHTML;
 
   h.dangerous = dangerous;
-  h.definition = definitions(tree);
+  h.definition = definitions(tree, settings);
   h.footnotes = [];
   h.augment = augment;
 

package.json

@@ -22,7 +22,7 @@
     "collapse-white-space": "^1.0.0",
     "detab": "^2.0.0",
     "has": "^1.0.1",
-    "mdast-util-definitions": "^1.1.1",
+    "mdast-util-definitions": "^1.2.0",
     "normalize-uri": "^1.0.0",
     "trim": "0.0.1",
     "trim-lines": "^1.0.0",

readme.md

@@ -44,6 +44,11 @@ Whether to allow `html` nodes and inject them as raw HTML (`boolean`,
 default: `false`).  Only do this when compiling later with
 `hast-util-to-html`.
 
+###### `options.commonmark`
+
+Set to `true` (default: `false`) to prefer the first when duplicate definitions
+are found.  The default behaviour is to prefer the last duplicate definition.
+
 ###### Returns
 
 [`HASTNode`][hast].

test/definition.js

@@ -15,5 +15,33 @@ test('Definition', function (t) {
     'should ignore `definition`'
   );
 
+  t.deepEqual(
+    to(u('paragraph', [
+      u('linkReference', {identifier: 'alpha'}, [u('text', 'bravo')]),
+      u('definition', {identifier: 'alpha', url: 'http://charlie.com'}),
+      u('definition', {identifier: 'alpha', url: 'http://delta.com'})
+    ])),
+    u('element', {tagName: 'p', properties: {}}, [
+      u('element', {tagName: 'a', properties: {href: 'http://delta.com'}}, [
+        u('text', 'bravo')
+      ])
+    ]),
+    'should prefer the last definition by default'
+  );
+
+  t.deepEqual(
+    to(u('paragraph', [
+      u('linkReference', {identifier: 'alpha'}, [u('text', 'bravo')]),
+      u('definition', {identifier: 'alpha', url: 'http://charlie.com'}),
+      u('definition', {identifier: 'alpha', url: 'http://delta.com'})
+    ]), {commonmark: true}),
+    u('element', {tagName: 'p', properties: {}}, [
+      u('element', {tagName: 'a', properties: {href: 'http://charlie.com'}}, [
+        u('text', 'bravo')
+      ])
+    ]),
+    'should prefer the first definition in commonmark mode'
+  );
+
   t.end();
 });