Add support for options.whitespace

Related to remarkjs/remark-math#61.
Related to remarkjs/remark-math#62.

Author: wooorm

index.js

@@ -20,6 +20,11 @@
  * @property {Whitespace} whitespace
  * @property {BreakBefore} breakBefore
  * @property {BreakAfter} breakAfter
+ *
+ * @typedef Options
+ *   Configuration.
+ * @property {Whitespace} [whitespace='normal']
+ *   Initial CSS whitespace setting to use.
  */
 
 import {convertElement} from 'hast-util-is-element'
@@ -103,15 +108,16 @@ const blockOrCaption = convertElement([
  * CSS-supporting user agent.
  *
  * @param {HastNode} node
+ * @param {Options} [options={}]
  * @returns {string}
  */
-export function toText(node) {
+export function toText(node, options = {}) {
   /** @type {Array.<HastChild>} */
   // @ts-ignore looks like a parent.
   const children = node.children || []
   const block = blockOrCaption(node)
   const whitespace = inferWhitespace(node, {
-    whitespace: 'normal',
+    whitespace: options.whitespace || 'normal',
     breakBefore: false,
     breakAfter: false
   })

readme.md

@@ -60,7 +60,7 @@ Delta echo foxtrot.
 This package exports the following identifiers: `toText`.
 There is no default export.
 
-### `toText(node)`
+### `toText(node, options?)`
 
 Utility to get the plain-text value of a [*node*][node].
 
@@ -70,9 +70,9 @@ Utility to get the plain-text value of a [*node*][node].
 *   If `node` is a [*root*][root] or [*element*][element], applies an algorithm
     similar to the `innerText` getter as defined by [HTML][]
 
-###### Parameters
+###### `options.whitespace`
 
-*   `node` ([`Node`][node]) — Thing to stringify
+Default whitespace setting to use (`'normal'` or `'pre'`, default: `'normal'`).
 
 ###### Returns
 

test.js

@@ -4,6 +4,30 @@ import {h} from 'hastscript'
 import {toText} from './index.js'
 
 test('hast-util-to-text', (t) => {
+  t.equal(
+    toText(h('div', 'a\n  b\t\nc')),
+    'a b c',
+    'should default to `whitespace: normal`'
+  )
+
+  t.equal(
+    toText(h('div', 'a\n  b\t\nc'), {whitespace: 'pre'}),
+    'a\n  b\t\nc',
+    'should support `whitespace: pre`'
+  )
+
+  t.equal(
+    toText(h('div', 'a\n  b\t\nc'), {whitespace: 'pre-wrap'}),
+    'a\n  b\t\nc',
+    'should support `whitespace: pre-wrap`'
+  )
+
+  t.equal(
+    toText(h('div', 'a\n  b\t\nc'), {whitespace: 'nowrap'}),
+    'a\n  b\t\nc',
+    'should support `whitespace: nowrap`'
+  )
+
   t.equal(
     toText(u('doctype', {name: 'html'})),
     '',