Add support for WHATWG URL

Fixes: vfile#16

lib/index.js

@@ -20,6 +20,7 @@
 
 import fs from 'fs'
 import path from 'path'
+import {fileURLToPath} from 'url'
 import buffer from 'is-buffer'
 import {VFile} from 'vfile'
 
@@ -35,6 +36,8 @@ import {VFile} from 'vfile'
 export function toVFile(options) {
   if (typeof options === 'string' || buffer(options)) {
     options = {path: String(options)}
+  } else if (options && options.href && options.origin) {
+    options = {path: fileURLToPath(options)}
   }
 
   return options instanceof VFile ? options : new VFile(options)

readme.md

@@ -27,9 +27,9 @@ npm install to-vfile
 ```js
 import {toVFile} from 'to-vfile'
 
-console.log(toVFile('readme.md'))
-console.log(toVFile.readSync('.git/HEAD'))
-console.log(toVFile.readSync('.git/HEAD', 'utf8'))
+console.log(toVFile(new URL('./readme.md', import.meta.url)))
+console.log(toVFile.readSync(new URL('./.git/HEAD', import.meta.url)))
+console.log(toVFile.readSync(new URL('./.git/HEAD', import.meta.url), 'utf8'))
 ```
 
 Yields:
@@ -67,7 +67,8 @@ There is no default export.
 Create a virtual file.
 Works like the [vfile][] constructor, except when `options` is `string` or
 `Buffer`, in which case it’s treated as `{path: options}` instead of
-`{value: options}`.
+`{value: options}`, or when `options` is a WHATWG `URL` object, in which case
+it’s treated as `{path: fileURLToPath(options)}`.
 
 ### `toVFile.read(options[, encoding][, callback])`
 

test.js

@@ -52,6 +52,18 @@ test('toVFile()', function (t) {
     st.equal(first, second)
     st.end()
   })
+
+  t.test('should accept a WHATWG URL object', function (st) {
+    var file = toVFile(new URL('file:///foo/bar/baz.qux'))
+
+    st.equal(file.path, join('/foo', 'bar', 'baz.qux'))
+    st.equal(file.basename, 'baz.qux')
+    st.equal(file.stem, 'baz')
+    st.equal(file.extname, '.qux')
+    st.equal(file.dirname, join('/foo', 'bar'))
+    st.equal(file.value, undefined)
+    st.end()
+  })
 })
 
 test('toVFile.readSync', function (t) {