Add link option

Closes GH-6.

lib/index.js

@@ -8,6 +8,8 @@
  * @property {ReadonlyArray<string> | null | undefined} [imageExtensions]
  *   File extensions (without dot) to treat as images (default:
  *   `defaultImageExtensions`).
+ * @property {boolean | null | undefined} [link]
+ *   Whether to wrap the image with a link to it (default: `true`).
  */
 
 import {collapseWhiteSpace} from 'collapse-white-space'
@@ -30,6 +32,7 @@ export default function remarkImages(options) {
   const settings = options || emptyOptions
   const imageExtensions = settings.imageExtensions || defaultImageExtensions
   const imageExtensionRegex = new RegExp(`\\.(${imageExtensions.join('|')})$`)
+  const link = settings.link !== false
 
   /**
    * Transform.
@@ -79,7 +82,7 @@ export default function remarkImages(options) {
         }
 
         // Add a link if we’re not already in one.
-        if (!interactive) {
+        if (link && !interactive) {
           replacement = {
             type: 'link',
             url: value,

readme.md

@@ -133,6 +133,8 @@ Configuration (TypeScript type).
 * `imageExtensions` (`Array<string>`, default:
   [`defaultImageExtensions`][api-default-image-extensions])
   — file extensions (without dot) to treat as images
+* `link` (`boolean`, default: `true`)
+  — whether to wrap the image with a link to it
 
 ## Syntax
 

test.js

@@ -196,4 +196,26 @@ test('remarkImages', async function (t) {
       '/a b c.jpg\n'
     )
   })
+
+  await t.test('should support `link: false`', async function () {
+    assert.equal(
+      String(
+        await remark()
+          .use(remarkImages, {link: false})
+          .process('https://example.com/alpha.jpg')
+      ),
+      '![](https://example.com/alpha.jpg)\n'
+    )
+  })
+
+  await t.test('should support `link: true`', async function () {
+    assert.equal(
+      String(
+        await remark()
+          .use(remarkImages, {link: true})
+          .process('https://example.com/alpha.jpg')
+      ),
+      '[![](https://example.com/alpha.jpg)](https://example.com/alpha.jpg)\n'
+    )
+  })
 })